Rotating electric machine having terminals bent to form joined portions

Provided is an excellent insulating rotating electric machine having a small axial size and a small number of components. In the rotating electric machine according to the present invention, radially outer-side terminals and radially inner-side terminals extend from slots while a circumferential bending direction is alternately changed for each group of n radially outer-side terminals or n radially inner-side terminals after the extension thereof from the slots. A first angle formed between at least one of an oblique-side portion of each of the n radially inner-side terminals, which are continuous in the circumferential direction of the stator core and are bent in the same circumferential bending direction, and an oblique-side portion of each of the n radially outer-side terminals, which are continuous in the circumferential direction and are bent the same circumferential bending direction, and an end surface of a stator core monotonously decreases in the circumferential bending direction.

CROSS REFERENCE TO RELATED APPLICATIONS

This application is a National Stage of International Application No. PCT/JP2017/014345 filed Apr. 6, 2017.

TECHNICAL FIELD

The present invention relates to a rotating electric machine, for example, an electric motor or a power generator, and more particularly, to a structure of a stator winding.

BACKGROUND ART

In recent years, for a rotating electric machine such as an electric motor or a power generator, a small size with a high output and high quality are demanded. Further, in order to achieve a higher output, there has been used a stator of a distributed winding type. In the stator of a distributed winding type, thick conductor wires are used to cause a large current to flow through a stator winding, and the conductor wires are arranged in slots.

However, when the winding of the distributed winding type formed of the thick conductor wires is used, there arise problems in that, as compared to a case in which a winding of a concentrated winding type is used, an axial length of the stator becomes longer, and the number of components increases.

In view of the circumstances described above, in a related-art rotating electric machine described in Patent Literature 1, a terminal wire extending from a radially innermost position is connected to a terminal wire being a target to be connected, which extends from a radially outermost position, across a coil end. A connected portion thereof is bent so as to be brought closer to the coil end to project radially outward. In this manner, the axial length of the stator is shortened, and the number of components is reduced.

CITATION LIST

Patent Literature

SUMMARY OF INVENTION

Technical Problem

In Patent Literature 1, it is difficult to define a sufficient distance between terminal wires adjacent to each other, and hence there arises a problem in that quality in terms of an insulating property is lowered.

The present invention has been made to solve the problems described above, and has an object to provide a rotating electric machine, which has a small size with a small number of components and high quality in terms of an insulating property.

Solution to Problem

According to one embodiment of the present invention, there is provided a rotating electric machine, including a stator including: a stator core having an annular shape, which includes slots arranged in a circumferential direction of the stator core; and a stator winding mounted to the stator core. The stator winding includes a plurality of winding bodies formed by distributed winding, each being formed by winding a conductor wire a plurality of turns, which are inserted into a plurality of the slots to be mounted to the stator core. Each of the winding bodies includes a radially inner-side terminal extending from a radially innermost position in a corresponding one of the slots to one axial side of the stator core and a radially outer-side terminal extending from a radially outermost position in a corresponding one of the slots to the one axial side of the stator core. Each of the radially inner-side terminals for forming each of phase windings of the stator winding among the radially inner-side terminals extends from a radially innermost position in a corresponding one of the slots on a one-by-one basis while a circumferential bending direction after the extension of the radially inner-side terminal from the corresponding slot is changed alternately for each group of n radially inner-side terminals (in which n is a natural number equal to or larger than 2). Each of the radially outer-side terminals for forming each of the phase windings of the stator winding among the radially outer-side terminals extends from a radially outermost position in a corresponding one of the slots on a one-by-one basis while a circumferential bending direction after the extension of the radially outer-side terminal from the corresponding slot is changed alternately for a group of n radially outer-side terminals. Each of the phase windings is formed by directly joining distal end portions of the radially inner-side terminals respectively extending from the slots being separate from each other by n slots to be bent so as to be brought closer to each other and directly joining distal end portions of the radially outer-side terminals respectively extending from the slots being separate from each other by n slots to be bent so as to be brought closer to each other. A first angle formed between at least one of an oblique-side portion of each of the n radially inner-side terminals, which are continuous in the circumferential direction and are bent in the same circumferential bending direction, and an oblique-side portion of each of the n radially outer-side terminals, which are continuous in the circumferential direction and are bent in the circumferential bending direction, and an end surface of the stator core monotonously decreases in the circumferential bending direction.

Advantageous Effects of Invention

According to one embodiment of the present invention, the phase winding is formed by directly joining the distal end portions of the radially inner-side terminals, which extend from the slots being separate from each other by the n slots and are bent so as to be brought closer to each other, and directly joining the distal end portions of the radially outer-side terminals respectively extending from the slots being separate from each other by the n slots to be bent so as to be brought closer to each other. In this manner, the radially inner-side terminals and the radially outer-side terminals are not required to be caused to pass on an axially outer side of a coil end group, thereby being capable of reducing an axial dimension of the stator. Further, another component such as a bus bar for connecting the terminals of the winding bodies is not required, thereby being capable of reducing the number of components of the stator.

Further, the first angle formed between at least one of the oblique-side portion of each of the n radially inner-side terminals, which are continuous in the circumferential direction and are bent in the same circumferential bending direction, and the oblique-side portion of each of the n radially outer-side terminals, which are continuous in the circumferential direction and are bent in the same circumferential bending direction, and the end surface of the stator core monotonously decreases in the circumferential bending direction. Thus, a distance between the oblique-side portions adjacent to each other in the circumferential direction increases, thereby enhancing the insulating property.

DESCRIPTION OF EMBODIMENTS

Now, with reference to the drawings, a rotating electric machine according to exemplary embodiments of the present invention is described.

First Embodiment

FIG. 1is a half sectional view for illustrating a rotating electric machine according to a first embodiment of the present invention.FIG. 2is a perspective view for illustrating a main part of the rotating electric machine according to the first embodiment of the present invention.FIG. 3is a perspective view for illustrating a stator to be applied to the rotating electric machine according to the first embodiment of the present invention.FIG. 4is a perspective view for illustrating a stator core to be applied to the rotating electric machine according to the first embodiment of the present invention.FIG. 5is a perspective view for illustrating a first winding body for forming a stator winding of the stator to be applied to the rotating electric machine according to the first embodiment of the present invention.FIG. 6is a front view for illustrating the first winding body for forming the stator winding of the stator in the rotating electric machine according to the first embodiment of the present invention.FIG. 7is an end view for illustrating the first winding body for forming the stator winding of the stator in the rotating electric machine according to the first embodiment of the present invention.FIG. 8is a perspective view for illustrating a second winding body for forming the stator winding of the stator to be applied to the rotating electric machine according to the first embodiment of the present invention.FIG. 9is a front view for illustrating the second winding body for forming the stator winding of the stator in the rotating electric machine according to the first embodiment of the present invention.FIG. 10is an end view for illustrating the second winding body for forming the stator winding of the stator in the rotating electric machine according to the first embodiment of the present invention.

InFIG. 1andFIG. 2, a rotating electric machine100includes a housing1, a stator10, and a rotor5. The housing1includes a frame2and an end plate3. The frame2has a bottomed cylindrical shape. The end plate3is configured to close an opening of the frame2. The stator10is firmly fixed to a cylindrical portion of the frame2in an internally fitted state. The rotor5is firmly fixed to a rotary shaft6rotatably supported in a bottom of the frame2and the end plate3through intermediation of bearings4, and is rotatably disposed on an inner peripheral side of the stator10.

The rotor5is a permanent magnet rotor including a rotor core7and permanent magnets8. The rotor core7is firmly fixed to the rotary shaft6inserted therethrough at an axial center position. The permanent magnets8are embedded in the stator core7on an outer peripheral surface side of the stator core7and are arranged at equal pitches in a circumferential direction of the rotor5to form magnetic poles. The rotor5is not limited to the permanent magnet rotor, and may be a squirrel-cage rotor in which an uninsulated rotor conductor is accommodated in slots of the rotor core and both sides thereof are short-circuited with use of a short-circuit ring or a winding rotor in which an insulated conductor wire is mounted to the slots of the rotor core.

Next, a configuration of the stator10is specifically described with reference toFIG. 3toFIG. 10.

The stator10includes, as illustrated inFIG. 3, a stator core11, a stator winding20, and slot cells13. The stator winding20is mounted to the stator core11. The slot cells13are mounted to slots12of the stator core11. The stator winding20is formed by connecting a plurality of winding bodies21mounted to the stator core11. Each of the slot cells13is formed by bending, for example, a rectangular sheet formed of a polyimide film sandwiched between meta-aramid fibers into a U shape. The slot cells13are inserted into the slots12to electrically separate the stator core11and the stator winding20from each other.

For convenience of the description, a pole number p of the rotor5is set to 10, a slot number S of the stator core11is set to 60, and the stator winding20is set to a three-phase winding. Specifically, the slots12are formed in the stator core11in a proportion of two slots per phase for each pole. InFIG. 3, for clear illustration of a wire connection state of radially inner-side terminals and radially outer-side terminals, the radially inner-side terminals and the radially outer-side terminals are illustrated in an exaggerated manner as projecting axially outward from a coil end group. However, in reality, as illustrated inFIG. 20, the radially inner-side terminals and the radially outer-side terminals have an axial height equal to that of the coil end group.

The stator core11is formed by, as illustrated inFIG. 4, laminating and integrating thin electromagnetic steel sheets. The stator core11includes a core back11ahaving an annular shape and a plurality of teeth11b. The plurality of teeth11bare arranged in a circumferential direction of the stator10so as to project radially inward from an inner peripheral wall surface of the core back11a. Spaces surrounded by the core back11aand the teeth11bcorrespond to the slots12. Each of the teeth11bis formed into a tapered shape having a circumferential width gradually decreasing toward a radially inner side. A cross section of each of the slots12, which is orthogonal to an axial center of the stator core11, has a rectangular shape.

The winding bodies21for forming the stator core20include first winding bodies21A and second winding bodies21b. The first winding body21A and the second winding body21B have different directions in which terminals extend. Each of the first winding body21A and the second winding body21B is a hexagonal coil formed by helically winding a conductor wire19having a circular cross section with a diameter d two turns into an approximately hexagonal shape. The conductor wire19is formed of, for example, a copper wire or an aluminum wire, which is continuous without a connecting portion and is insulation-coated with an enamel resin. Specifically, each of the first winding body21A and the second winding body21B is a winding body formed by distributed winding and lap winding. Each of the winding bodies21may be formed of a conductor wire having a rectangular cross section in place of the conductor wire19having the circular cross section.

The first winding body21A includes, as illustrated inFIG. 5toFIG. 7, a first straight portion21a, a second straight portion21b, a first coil end21c, a second coil end21d, a radially inner-side terminal21e, and a radially outer-side terminal21f. The first straight portion21aand the second straight portion21bare arranged in two rows so as to be separate from each other by a six-slot-angle distance. In each of the row of the first straight portion21aand the row of the second straight portion21b, two conductor wires are arranged so as to be held in contact with each other in a radial direction. The first coil end21ccouples one longitudinal end of the first straight portion21aand one longitudinal end of the second straight portion21bto each other, and the second coil end21dcouples another longitudinal end of the first straight portion21aand another longitudinal end of the second straight portion21bto each other between the rows of the first straight portion21aand the second straight portion21bso as to alternate the rows. The “six-slot-angle distance” is a distance between slot centers of the slots12located on both sides of continuous six teeth11band corresponds to one magnetic-pole pitch. The “radial direction” corresponds to a radial direction of the stator core11.

The first coil end21cextends outward in a length direction of the first straight portion21aand the second straight portion21bfrom one end of the first straight portion21ain one of the rows toward the second straight portion21bin another one of the rows, is bent at the center between the row of the first straight portion21aand the row of the second straight portion21bto be displaced radially inward by 2d, and is then bent to extend inward in the length direction of the first straight portion21aand the second straight portion21btoward the second straight portion21bin the another one of the rows to be connected to one end of the second straight portion21bin the another one of the rows.

Similarly, the second coil end21dextends outward in a length direction of the first straight portion21aand the second straight portion21bfrom another end of the second straight portion21bin another one of the rows toward the first straight portion21ain another one of the rows, is bent at the center between the row of the first straight portion21aand the row of the second straight portion21bto be displaced radially outward by d, and is then bent to extend inward in the length direction of the first straight portion21aand the second straight portion21btoward the first straight portion21ain one of the rows to be connected to another end of the first straight portion21ain one of the rows.

The radially inner-side terminal21eextends from the another end of the second straight portion21b, which is located on the radially inner side, toward the first straight portion21ain the one row so as to be approximately parallel to the second coil end21d, is bent at the approximate center between the row of the first straight portion21aand the row of the second straight portion21bto extend outward in the length direction of the first straight portion21aand the second straight portion21b. The radially-outer terminal21fextends from the another end of the first straight portion21a, which is located on the radially outer side, toward the second straight portion21bin the another one of the rows so as to be approximately parallel to the second coil end21dand is bent at the approximate center between the row of the first straight portion21aand the row of the second straight portion21bto extend outward in the length direction of the first straight portion21aand the second straight portion21b.

The first winding body21ahaving the configuration described above is accommodated in a first layer and a second layer from the radially outer side in one slot12, and the second straight portion21bis accommodated in a third layer and a fourth layer from the radially outer side in the slot12, which is separate from the one slot12by the six-slot-angle distance. The radially outer-side terminal21fextends to a vicinity of top of the second coil end21dwhile maintaining the same radial position as that of the first straight portion21aaccommodated in the first layer from the radially outer side in the one slot12. The radially inner-side terminal21eextends to the vicinity of the top of the second coil end21dwhile maintaining the same radial position as that of the second straight portion21baccommodated in the fourth layer from the radially outer side in the slot12, which is separate from the one slot12by the six-slot-angle distance.

The second winding body21B includes, as illustrated inFIG. 8toFIG. 10, a first straight portion21a, a second straight portion21b, a first coil end21c, a second coil end21d, a radially inner-side terminal21g, and a radially outer-side terminal21h. The first straight portion21aand the second straight portion21bare arranged in two rows so as to be separate from each other by a six-slot-angle distance. In each of the row of the first straight portion21aand the row of the second straight portion21b, two conductor wires are arranged so as to be held in contact with each other in a radial direction. The first coil end21ccouples one longitudinal end of the first straight portion21aand one longitudinal end of the second straight portion21bto each other, and the second coil end21dcouples another longitudinal end of the first straight portion21aand another longitudinal end of the second straight portion21bto each other between the rows of the first straight portion21aand the second straight portion21bso as to alternate the rows.

The first coil end21cextends outward in a length direction of the first straight portion21aand the second straight portion21bfrom one end of the first straight portion21ain one of the rows toward the second straight portion21bin another one of the rows, is bent at the center between the row of the first straight portion21aand the row of the second straight portion21bto be displaced radially inward by 2d, and is then bent to extend inward in the length direction of the first straight portion21aand the second straight portion21btoward the second straight portion21bin the another one of the rows to be connected to one end of the second straight portion21bin the another one of the rows.

Similarly, the second coil end21dextends outward in a length direction of the first straight portion21aand the second straight portion21bfrom another end of the second straight portion21bin another one of the rows toward the first straight portion21ain one of the rows, is bent at the center between the row of the first straight portion21aand the row of the second straight portion21bto be displaced radially outward by d, and is then bent to extend inward in the length direction of the first straight portion21aand the second straight portion21btoward the first straight portion21ain the one of the rows to be connected to another end of the first straight portion21ain the one of the rows.

After the radially inner-side terminal21gis bent at a displacement portion21iextending from the another end of the second straight portion21blocated on the radially inner side to be displaced radially inward by d, the radially inner-side terminal21gextends approximately in parallel to a portion of the second coil end21d, which extends from the another end of the first straight portion21ato the center between the row of the first straight portion21aand the row of the second straight portion21b. After that, the radially inner-side terminal21gis bent to extend outward in the length direction of the first straight portion21aand the second straight portion21b. After the radially outer-side terminal21his bent at a displacement portion21jextending from the another end of the first straight portion21alocated on the radially outer side to be displaced radially outward by d, the radially outer-side terminal21hextends approximately in parallel to a portion of the second coil end21d, which extends from the another end of the second straight portion21bto the center between the row of the first straight portion21aand the row of the second straight portion21b. After that, the radially outer-side terminal21his bent to extend outward in the length direction of the first straight portion21aand the second straight portion21b.

In the second winding body21B having the configuration described above, the first straight portion21ais accommodated in a first layer and a second layer from the radially outer side in one slot12, and the second straight portion21bis accommodated in a third layer and a fourth layer from the radially outer side in the slot12, which is separate from the one slot12by the six-slot-angle distance. After the radially outer-side terminal21his displaced radially outward by d at the displacement portion21jwith respect to the first straight portion21aaccommodated in the first layer from the radially outer side in the one slot12, the radially outer-side terminal21hextends outward in a circumferential direction of the second winding body21B. After the radially inner-side terminal21gis displaced radially inward by d at the displacement portion21iwith respect to the second straight portion21baccommodated in the fourth layer from the radially outer side in the slot12, which is separate from the one slot by the six-slot angle distance, the radially inner-side terminal21gextends outward in the circumferential direction of the second winding body21B.

Next, a method of mounting the first winding bodies21A and the second winding bodies21B to the stator core11is described with reference toFIG. 11toFIG. 15.FIG. 11is an end view of a main part, for illustrating a method of mounting the winding body, which is the first one to be mounted, to the stator core in the rotating electric machine according to the first embodiment of the present invention.FIG. 12is an end view of a main part, for illustrating a method of mounting the winding body, which is the third one to be mounted, to the stator core in the rotating electric machine according to the first embodiment of the present invention.FIG. 13is an end view for illustrating a method of mounting last six mounting bodies to the stator core in the rotating electric machine according to the first embodiment of the present invention.FIG. 14is an end view for illustrating the method of mounting the last six winding bodies to the stator core in the rotating electric machine according to the first embodiment of the present invention.FIG. 15is an end view for illustrating the stator core to which the winding bodies are mounted in the rotating electric machine according to the first embodiment of the present invention.FIG. 16is a side view of a main part, for illustrating the stator in the rotating electric machine according to the first embodiment of the present invention when viewed from the radially outer side.FIG. 17is a view for illustrating bending shapes of the radially outer-side terminals of the stator winding in the rotating electric machine according to the first embodiment of the present invention. InFIG. 11toFIG. 14, the winding bodies are representatively illustrated as the first straight portions and the second straight portions. InFIG. 16andFIG. 17, only the radially outer-side terminals are illustrated.

First, the winding body21is formed by helically winding the conductor wire19two turns. For convenience of the description, the winding bodies21are denoted as a winding body211, a winding body212, a winding body213. . . a winding body2159, and a winding body2160in the order of assembly.

Then, as illustrated inFIG. 11, the first winding body211is inserted into a pair of the slots12of the stator core11, which are separate from each other by the six-slot-angle distance, from the radially inner side. Similarly, the second winding body212is inserted into a pair of the slots12, which are shifted by one slot pitch to one side in a circumferential direction (hereinafter referred to as “first circumferential direction”), from the radially inner side. Subsequently, as illustrated inFIG. 12, the third winding body213is inserted into a pair of the slots12, which are shifted by one slot pitch in the first circumferential direction, from the radially inner side. The above-mentioned procedure is repeated so as to complete mounting of the winding bodies up to a fifty-fourth winding body2154to the stator core11.

Subsequently, as illustrated inFIG. 13, the second straight portions21bof the first to sixth winding bodies21(from the first winding body211to the sixth winding body216), which are each accommodated in the third layer and the fourth layer from the radially outer side in the slot12, are drawn out radially inward from the slots12. Subsequently, in a similar manner, a fifty-fifth winding body2155, a fifty-sixth winding body2156, a fifth-seventh winding body2157. . . and a sixtieth winding body2160are mounted one by one into the stator core11in the stated order. Then, as illustrated inFIG. 14, the second straight portions21bof the first to sixth winding bodies (from the first winding body211to the sixth winding body216) are inserted to the third layer and the fourth layer in the slots12from the radially outer side to thereby complete the mounting of the sixty winding bodies21to the stator core11.

The first winding bodies21A are used for first to sixth, thirteenth to eighteenth, twenty-fifth to thirtieth, thirty-seventh to forty-second, and fourth-ninth to fifty-fourth windings21, and the second winding bodies21B are used for seventh to twelfth, nineteenth to twenty-fourth, thirty-first to thirty-sixth, forty-third to forty-eighth, and fifty-fifth to sixtieth winding bodies21.

As described above, sets of six first winding bodies21A and sets of six second winding bodies21B are alternately mounted to the stator core11. The radially inner-side terminal21eof each of the first winding bodies21A maintains a fourth radial position from the radially outer side in the slot12, whereas the radially outer-side terminal21fmaintains a first radial position from the radially outer side in the slot12. Further, the radially inner-side terminal21gof each of the second winding bodies21B is displaced radially inward from the fourth radial position from the radially outer side in the slot12by the width d of the conductor19, whereas the radially outer-side terminal21his displaced radially outward from the first radial position from the radially outer side in the slot12by the width d of the conductor19.

In the manner described above, the radially inner-side terminals21eand21gproject toward a radially inner side of a coil end group20a, whereas the radially outer-side terminals21fand21hproject toward a radially outer side of the coil end group20a. As illustrated inFIG. 15, each terminal pair includes the first winding body21A and the second winding body21B, which are separate from each other by 180 degrees in electrical angle so that a distal end portion of the radially inner-side terminal21eof the first winding body21A and a distal end portion of the radially inner-side terminal21gof the second winding body21B are held in contact with each other in the radial direction. Six terminal pairs described above are arranged in the circumferential direction as one set. Five sets described above are arranged so as to be separate from each other in the circumferential direction. Further, each terminal pair includes the first winding body21A and the second winding body21B, which are separate from each other by 180 degrees in electrical angle so that a distal end portion of the radially outer-side terminal21fof the first winding body21A and a distal end portion of the radially outer-side terminal21hof the second winding body21B are held in contact with each other in the radial direction. Six terminal pairs described above are arranged in the circumferential direction as one set. Four sets described above are arranged so as to be separate from each other in the circumferential direction. Twelve radially-outer side terminals21fand21hare arranged between the sets of terminal pairs at one-slot pitches.

In the set of six terminal pairs arranged in the circumferential direction, in which the distal end portions of the radially outer-side terminals21fof the first winding bodies21A and the distal end portions of the radially outer-side terminals21hof the second winding bodies21B, which are separate from each other by 180 degrees in electrical angle, are arranged so as to be held in contact with each other in the radial direction, as illustrated inFIG. 16, an oblique-side portion21fsof each of the radially outer-side terminals21fand an oblique-side portion21hsof a corresponding one of the radially outer-side terminals21hcross each other when viewed from the radially outer side. Specifically, the oblique-side portions21fsof the radially outer-side terminals21fof the first winding bodies21A, which extend from the slots, are bent in the first circumferential direction. Meanwhile, the oblique-side portions21hsof the radially outer-side terminals21hof the second winding bodies21B, which extend from the slots, are bent in a second circumferential direction, which is a direction opposite to the first circumferential direction.

More specifically, as illustrated inFIG. 17, when six radially outer-side terminals21fare denoted for convenience as a radially outer-side terminal21f1, a radially outer-side terminal21f2, a radially outer-side terminal21f3. . . , and a radially outer-side terminal21f6in the order of arrangement in the first circumferential direction, first angles θ1, θ2, θ3. . . , and θ6, each being formed between a surface of the oblique-side portion21fsof the radially outer-side terminal21f1,21f2,21f3. . .21f6, which is oriented forward in the first circumferential direction, and an end surface of the stator core11have a relationship of: θ1>θ2>θ3. . . >θ6. Specifically, the first angle θ gradually decreases in the first circumferential direction, which is a bending direction of the oblique-side portions21fsof the radially outer-side terminals21f.

Meanwhile, when six radially outer-side terminals21hare denoted for convenience as a radially outer-side terminal21h1, a radially outer-side terminal21h2, a radially outer-side terminal21h3. . . , and a radially outer-side terminal21h6in the order of arrangement in the first circumferential direction, the first angle θ formed between a surface of the oblique-side portion21hsof the radially outer-side terminal21h1,21h2,21h3. . .21h6, which is oriented forward in the second circumferential direction, and the end surface of the stator core11gradually decreases in the second circumferential direction, which is a bending direction of the oblique-side portions21hsof the radially outer-side terminals21h.

A distal end portion21faof the radially outer-side terminal21fand a distal end portion21haof the radially outer-side terminal21h, which are held in contact with each other in the radial direction, are located at the same height position from the end surface of the stator core11.

Although not illustrated, even in the sets, each including six terminal pairs arranged in the circumferential direction so that the distal end portion of the radially inner-side terminal21eof the first winding body21A and the distal end portion of the radially inner-side terminal21gof the second winding body21B of each terminal pair, which are separate from each other by 180 degrees in electrical angle, are held in contact with each other in the radial direction, an oblique-side portion of each of the radially inner-side terminals21eand an oblique-side portion of a corresponding one of the radially inner-side terminals21gcross each other when viewed from the radially inner side.

Meanwhile, when six radially inner-side terminals21eare denoted for convenience as a radially inner-side terminal21e1, a radially inner-side terminal21e2, a radially inner-side terminal21e3. . . , and a radially inner-side terminal21e6in the order of arrangement in the second circumferential direction, the first angle θ formed between a surface of the oblique-side portion of the radially inner-side terminal21e1,21e2,21e3. . .21e6, which is oriented forward in the second circumferential direction, and the end surface of the stator core11gradually decreases in the second circumferential direction, which is a bending direction of the oblique-side portions of the radially inner-side terminals21e. Further, when six radially inner-side terminals21gare denoted for convenience as a radially inner-side terminal21g1, a radially inner-side terminal21g2, a radially inner-side terminal21g3. . . , and a radially inner-side terminal21g6in the order of arrangement in the first circumferential direction, the first angle θ formed between a surface of the oblique-side portion21gsof the radially inner-side terminal21gg1,21g2,21g3. . .21g6, which is oriented forward in the first circumferential direction, and the end surface of the stator core11gradually decreases in the first circumferential direction, which is a bending direction of the oblique-side portions of the radially outer-side terminals21g. A distal end portion of the radially inner-side terminal21eand a distal end portion of the radially inner-side terminal21g, which are held in contact with each other in the radial direction, are located at the same height position from the end surface of the stator core11.

Next, a wire connection method for the stator winding20is described with reference toFIG. 18,FIG. 19A, andFIG. 19B.FIG. 18is an end view of the stator in the rotating electric machine according to the first embodiment of the present invention when viewed from the axial direction.FIG. 19Ais a view for illustrating wire connection of a U1-phase winding of the stator winding in the rotating electric machine according to the first embodiment of the present invention.FIG. 19Bis a view for illustrating wire connection of a U2-phase winding of the stator winding in the rotating electric machine according to the first embodiment of the present invention. InFIG. 18, the winding bodies21are representatively illustrated as the first straight portions and the second straight portions.

InFIG. 18, slot numbers1,7,13. . .49, and55are sequentially allocated to the slots12in the circumferential direction. Numbers U1-1a, U-2a. . . , and U1-10aand U1-1b, U1-2b. . . , and U1-10bdenote the first straight portions21a, which are continuous with the radially outer-side terminals21fand21hof the winding bodies21that form the U1-phase winding mounted to a group of the slots12with the slot numbers (1+6n) (in which n is a natural number including 0). Numbers U2-1a, U2-2a. . . , and U2-10aand U2-1b, U2-2b. . . , and U2-10bdenote the second straight portions21b, which are continuous with the radially inner-side terminals21eand21gof the winding bodies21that form the U2-phase winding mounted to a group of the slots12with the slot numbers (2+6n).

The winding bodies21are mounted to a group of slots with slot numbers (3+6n) to form a V1-phase winding. The winding bodies21are mounted to a group of slots with slot numbers (4+6n) to form a V2-phase winding. The winding bodies21are mounted to a group of slots with slot numbers (5+6n) to form a W1-phase winding. The winding bodies21are mounted to a group of slots with slot numbers (6+6n) to form a W2-phase winding. The wire connection is performed in the same manner for the U-phase winding, the V-phase winding, and the W-phase winding. Thus, the wire connection method is described only for the U-phase winding.

First, as illustrated inFIG. 19A, connection between U1-1band U1-2b, U1-2aand U1-3a, U1-3band U1-4b, U1-4aand U1-5a, U1-5band U1-6b, U1-6aand U1-7a, U1-7band U1-8b, U1-8aand U1-9a, and U1-9band U1-10b, which are separate from each other in each set by one magnetic-pole pitch in the circumferential direction, is performed by, for example, welding to form the U1-phase winding. The connection between U1-1band U1-2bcorresponds to connection between the radially outer-side terminal21fextending from the first straight portion21adenoted by U1-1band the radially outer-side terminal21hextending from the first straight portion21adenoted by U1-2bto each other.

Next, as illustrated inFIG. 19B, connection between U2-1band U2-2b, U2-2aand U2-3a, U2-3band U2-4b, U2-4aand U2-5a, U2-5band U2-6b, U2-6aand U2-7a, U2-7band U2-8b, U2-8aand U2-9a, and U2-9band U2-10b, which are separate from each other in each set by one magnetic-pole pitch in the circumferential direction, is performed by, for example, welding to form the U2-phase winding. Subsequently, U1-10aand U2-1aare connected by, for example, welding to connect the U1-phase winding and the U2-phase winding in series. As a result, the U-phase winding having U1-1aas a feeding terminal and U2-10aas a neutral point is formed.

The V-phase winding and the W-phase winding are formed in a similar manner. The neutral points are wire-connected to obtain the stator winding20formed as a three-phase AC winding in which the U-phase winding, the V-phase winding, and the W-phase winding are wire-connected in a Y-connection configuration.

A wire connection state of the stator winding20of the stator10, which is formed as described above, is described with reference toFIG. 20andFIG. 21.FIG. 20is an end view for illustrating the stator in the rotating electric machine according to the first embodiment of the present invention, andFIG. 21is a sectional view taken along the line XXI-XXI ofFIG. 20when viewed in the direction indicated by the arrows.

In the stator10, as illustrated inFIG. 20andFIG. 21, six terminal pairs, each including the radially inner-side terminals21eand21gbeing held with each other in the radial direction, are arranged in the circumferential direction on the radially inner side of the coil end group20ato form a group of terminal pairs. Five groups of the six terminal pairs are formed so as to be separate from each other in the circumferential direction. Six terminal pairs, each including the radially outer-side terminals21fand21hbeing held in contact with each other in the radial direction, are arranged in the circumferential direction on the radially outer side of the coil end group20ato form a group of terminal pairs. Four groups of six terminal pairs are formed so as to be separate from each other in the circumferential direction. Each of beads15obtained by joining distal end portions of the pair of the radially inner-side terminals21eand21gto each other and distal end portions of the pair of the radially outer-side terminals21fand21hto each other by, for example, welding, is coated with an insulating member17such as an insulating tape, cap, or powder so as to be insulated. At this time, the insulating coating is released from a distal end portion of each of the terminals so that the distal end portions of the terminals are joined to each other. Thus, a portion of the distal end portion of each of the terminals at the periphery of the bead15, from which the insulating coating is released, is coated and insulated with the insulating member17at the same time. The bead15and a portion of the distal end portions connected to each other, which is at the periphery of the bead15, form a connecting portion.

The rotating electric machine100using the stator10obtained by the wire connection described above operates as a 10-pole, 60-slot inner rotor three-phase motor with AC power fed to the stator winding20.

As described above, according to the first embodiment, sixty (the same number as a total number of slots) winding bodies21formed by distributed winding and lap winding are mounted to the stator core11at one-slot pitches. Then, the winding bodies21are formed so that the radially inner-side terminals21eand21g, each being one end of the conductor19, extend from a radially innermost position in the slot12toward the one axial side of the stator core11and the radially outer-side terminals21fand21h, each being another end of the conductor19, extend from a radially outermost position in the slot12toward the one axial side of the stator core11. Further, each phase winding of the stator winding20is formed by directly joining the radially inner-side terminals21eand21gof the winding bodies21for forming the same phase to each other and directly joining the radially outer-side terminals21fand21hthereof to each other.

Thus, the radially inner-side terminals21eand21gand the radially outer-side terminals21fand21hare not required to be caused to pass on an axially outer side of the coil end group20a. Thus, an axial dimension of the stator10can be reduced.

Further, another component such as a bus bar, which is configured to connect the terminals of the winding bodies21to each other, is not required. Thus, the number of components of the stator10can be reduced.

The radially inner-side terminal21eof the first winding body21A maintains the fourth radial position in the slot12from the radially outer side, and the radially outer-side terminal21fmaintains the first radial position in the slot12from the radially outer side. The radially inner-side terminal21gof the second winding body21B is displaced radially inward from the fourth radial position in the slot12from the radially outer side by the width d of the conductor wire19, and the radially outer-side terminal21hthereof is displaced radially outward from the first radial position in the slot12from the radially outer side by the width d of the conductor wire19. In this manner, the radially inner-side terminal21gcan be led in the circumferential direction without interference with the radially inner-side terminal21eso that an end of the radially inner-side terminal21gis joined to an end of the radially inner-side terminal21e, which is a target to be joined. Further, the radially outer-side terminal21hcan be led in the circumferential direction without interference with the radially outer-side terminal21fso that an end of the radially outer-side terminal21his joined to an end of the radially outer-side terminal21f, which is a target to be joined. Thus, radial projection of the coil end group20acan be reduced.

Six radially outer-side terminals21fand six radially outer-side terminal21h, which extend from the radially outermost position in the slots12, are arranged so that a group of the six radially outer-side terminals21fand a group of the six radially outer-side terminals21hare arranged alternately in the circumferential direction. The six radially outer-side terminals21fextend from the slots12and are then bent in the first circumferential direction. The six radially outer-side terminals21hextend from the slots12and are then bent in the second circumferential direction so as to be brought closer to the radially outer-side terminals21fbeing targets to be connected, which are separate from the radially outer-side terminals21hby six slots, to be connected to the radially outer-side terminals21fbeing the targets to be connected. Specifically, the radially outer-side terminals21fand21hare bent in the different circumferential directions for every six slots. In the set of six radially outer-side terminals21fand six radially outer-side terminals21hin which the group of the six radially outer-side terminals21fand the group of the six radially outer-side terminals21hare adjacent to each other in the circumferential direction, each of the radially outer-side terminals21fand a corresponding one of the radially outer-side terminals21hare bent so as to be brought closer to each other. Further, in the set of the six radially outer-side terminals21fand the six radially outer-side terminals21hin which the group of the six radially outer-side terminals21fand the group of the six radially outer-side terminals21hare adjacent to each other in the circumferential direction, the first angle θ formed between the surface of the oblique-side portion21fsof the radially outer-side terminal21f, which is oriented forward in the first circumferential direction, and the end surface of the stator core11gradually decreases in the first circumferential direction. Further, the first angle θ formed between the surface of the oblique-side portion21hsof the radially outer-side terminal21h, which is oriented forward in the second circumferential direction, and the end surface of the stator core11gradually decreases in the second circumferential direction. As a result, a distance between the oblique-side portions21fsof the radially outer-side terminals21fadjacent to each other and a distance between the oblique-side portions21hsof the radially outer-side terminals21hadjacent to each other can be increased. Hence, an insulating property can be improved. Further, a distance between the connecting portions, each being formed between the distal end portion21faof the radially outer-side terminal21fand the distal end portion21haof the radially outer-side terminal21h, which are adjacent to each other, can be increased. Hence, the insulating property can be improved.

Six radially inner-side terminals21eand six radially inner-side terminal21g, which extend from the radially innermost position in the slots12, are arranged so that a group of the six radially inner-side terminals21eand a group of the six radially inner-side terminals21gare arranged alternately in the circumferential direction. The six radially inner-side terminals21eextend from the slots12and are then bent in the second circumferential direction. The six radially inner-side terminals21gextend from the slots12and are then bent in the first circumferential direction so as to be brought closer to the radially inner-side terminals21ebeing targets to be connected, which are separate from the radially inner-side terminals21gby six slots, to be connected to the radially inner-side terminals21ebeing the targets to be connected. Specifically, the radially inner-side terminals21eand21gare bent in the different circumferential directions for every six slots. In the set of six radially inner-side terminals21eand six radially inner-side terminals21gin which the group of the six radially inner-side terminals21eand the group of the six radially inner-side terminals21gare adjacent to each other in the circumferential direction, each of the radially inner-side terminals21eand a corresponding one of the radially inner-side terminals21gare bent so as to be brought closer to each other. Further, in the set of the six radially inner-side terminals21eand the six radially inner-side terminals21gin which the group of the six radially inner-side terminals21eand the group of the six radially inner-side terminals21gare adjacent to each other in the circumferential direction, the first angle θ formed between the surface of the oblique-side portion21fsof the radially inner-side terminal21e, which is oriented forward in the second circumferential direction, and the end surface of the stator core11gradually decreases in the second circumferential direction. Further, the first angle θ formed between the surface of the oblique-side portion21hsof the radially inner-side terminal21g, which is oriented forward in the first circumferential direction, and the end surface of the stator core11gradually decreases in the first circumferential direction. As a result, a distance between the oblique-side portions of the radially inner-side terminals21eadjacent to each other and a distance between the oblique-side portions of the radially inner-side terminals21gadjacent to each other can be increased. Hence, an insulating property can be improved. Further, a distance between the connecting portions, each being formed between the distal end portion of the radially inner-side terminal21eand the distal end portion of the radially inner-side terminal21g, which are adjacent to each other, can be increased. Hence, the insulating property can be improved.

In the first embodiment described above, the first angle θ formed between the oblique-side portion of the radially outer-side terminal and the end surface of the stator core and between the oblique-side portion of the radially inner-side terminal and the end surface of the stator core gradually decreases in a direction of being brought closer to the terminal to be joined. When insulating performance has a margin, the first angle θ may be the same for a plurality of the oblique-side portions as long as the first angle θ monotonously decreases in the direction of being brought closer to the terminal to be joined. For example, inFIG. 17, the first angles θ1to θ6may have a relationship of: θ1=θ2>θ3>θ4>θ5>θ6. Further, a potential difference between the terminals of the same phase is small. Thus, in a portion in which the terminals of the same phase are adjacent to each other in the circumferential direction, the first angle θ may be set to the same angle.

Second Embodiment

FIG. 22is a side view of a main part, for illustrating a stator in a rotating electric machine according to a second embodiment of the present invention when viewed from a radially outer side. InFIG. 22, only radially outer-side terminals are illustrated.

InFIG. 22, a thermistor50serving as a temperature detector is disposed between the oblique-side portions21fsof the radially outer-side terminals21fadjacent to each other in the circumferential direction.

Other configurations are the same as those of the first embodiment described above.

Even in the second embodiment, the first angle θ formed between the surface of the oblique-side portion21fsof the radially outer-side terminal21f, which is oriented forward in the first circumferential direction, and the end surface of the stator core11, gradually decreases in the first circumferential direction, and a distance between the oblique-side portions21fsof the radially outer-side terminals21fadjacent to each other increases. Thus, the thermistor50can be stably installed under a state of being held in contact with the oblique-side portion21fsof the radially outer-side terminal21f. At the same time, a temperature of a coil end can be precisely measured.

Third Embodiment

FIG. 23is a side view of a main part, for illustrating a stator in a rotating electric machine according to a third embodiment of the present invention when viewed from a radially outer side. InFIG. 23, only radially outer-side terminals are illustrated.

InFIG. 23, the distal end portion21faof the radially outer-side terminal21fis bent at an end of the oblique-side portion21fs, and the distal end portion21haof the radially outer-side terminal21his bent at an end of the oblique-side portions21hsto extend axially outward. In the set of six radially outer-side terminals21fand six radially outer-side terminals21hin which the group of the six radially outer-side terminals21fand the group of the six radially outer-side terminals21hare adjacent to each other in the circumferential direction, distances L1, L2, L3, L4, and L5between the pairs of the distal end portions, each including the distal end portion21faof the radially outer-side terminal21fand the distal end portion21haof the radially outer-side terminal21h, are the same. Height positions of the distal end portions21faof the radially outer-side terminals21fand the distal end portions21haof the radially outer-side terminals21hfrom the end surface of the stator core11are the same.

Other configurations are the same as those of the first embodiment described above.

According to the third embodiment, the distances L1, L2, L3, L4, and L5between the pairs of the distal end portions, each including the distal end portion21faof the radially outer-side terminal21fand the distal end portion21haof the radially outer-side terminal21h, are the same, and the height positions of the distal end portions21faof the radially outer-side terminals21fand the distal end portions21haof the radially outer-side terminals21hfrom the end surface of the stator core11are the same for the pairs. Thus, a step of connecting the distal end portion21faof the radially outer-side terminal21fand the distal end portion21haof the radially outer-side terminal21his simplified. At the same time, stable joint strength can be obtained.

In the third embodiment, in the set of the six radially outer-side terminals21fand the six radially outer-side terminals21hin which the group of the six radially outer-side terminals21fand the group of the six radially outer-side terminals21hare adjacent to each other in the circumferential direction, the first angle θ formed between the surface of the oblique-side portion21fsof the radially outer-side terminal21f, which is oriented forward in the first circumferential direction, and the end surface of the stator core11gradually decreases in the first circumferential direction. Further, the first angle θ formed between the surface of the oblique-side portion21hsof the radially outer-side terminal21h, which is oriented forward in the second circumferential direction, and the end surface of the stator core11gradually decreases in the second circumferential direction. Thus, a height position of a bent portion of the oblique-side portion21fs, at which the distal end portion21faof the radially outer-side terminal21fis defined, from the end surface of the stator core11is gradually decreased in the first circumferential direction. Further, a height position of a bent portion of the oblique-side portion21hs, at which the distal end portion21haof the radially outer-side terminal21his defined, from the end surface of the stator core11is gradually decreased in the second circumferential direction. In this manner, the height positions of the connecting portions, each being formed between the distal end portion21faof the radially outer-side terminal21fand the distal end portion21haof the radially outer-side terminal21h, are set to be the same. Further, the distances between the pairs, each including the distal end portion21faof the radially outer-side terminal21fand the distal end portion21haof the radially outer-side terminal21h, are set to be the same.

The radially outer-side terminals21fand21hhave been described. However, the radially inner-side terminals21eand21gare formed in a similar manner.

In the third embodiment, the configuration applied to the rotating electric machine according to the first embodiment has been described. However, the configuration may be applied to a rotating electric machine according to other embodiments.

Fourth Embodiment

FIG. 24is a side view of a main part, for illustrating a stator in a rotating electric machine according to a fourth embodiment of the present invention when viewed from a radially outer side. InFIG. 24, only the second coil end21dis illustrated.

InFIG. 24, in a set of six second coil ends21darranged in the circumferential direction, for the second coil end21dhaving an oblique-side portion bent in the first circumferential direction, the first angle θ formed between a surface of the oblique-side portion of the second coil end21d, which is oriented forward in the first circumferential direction, and the end surface of the stator core monotonously decreases in the first circumferential direction. For the second coil end21dhaving an oblique-side portion bent in the second circumferential direction, the first angle θ formed between a surface of the oblique-side portion of the second coil end21d, which is oriented forward in the second circumferential direction, and the end surface of the stator core monotonously decreases in the second circumferential direction. The oblique-side portion is bent in the second circumferential direction. Height positions of tops of the second coil ends21dfrom the end surface of the stator core11are constant.

Other configurations are the same as those of the first embodiment described above.

According to the fourth embodiment, a distance between the oblique-side portions of the second coil ends21dadjacent to each other in the circumferential direction is increased. Hence, the insulating property can be improved.

The second coil ends21dhave been described. However, even for a first angle formed between each of a pair of oblique-side portions through top of a first coil end21ctherebetween and the end surface of the stator core, similarly to the second coil end21d, the first angle formed between the surface oriented forward in a bending direction of the oblique-side portion and the end surface of the stator core monotonously decreases in the bending direction.

In the fourth embodiment, the configuration applied to the rotating electric machine according to the first embodiment has been described. However, the configuration may be applied to a rotating electric machine according to other embodiments.

Fifth Embodiment

FIG. 25Ais a view for illustrating wire connection of a stator winding in a rotating electric machine according to a second embodiment of the present invention, andFIG. 25Bis a view for illustrating wire connection of the stator winding in the rotating electric machine according to the second embodiment of the present invention.

The third embodiment has the same configuration as that of the first embodiment described above except for a difference in the wire connection method for the stator winding.

The V-phase winding and the W-phase winding are formed in a similar manner. The neutral points are wire-connected to obtain the stator winding formed as a three-phase AC winding in which the U-phase winding, the V-phase winding, and the W-phase winding are wire-connected in a Y-connection configuration.

Even in the fifth embodiment, the winding bodies21are mounted to the stator core at one-slot pitches so that the radially inner-side terminals21eand21gof the winding bodies21project toward the radially inner side of the coil end group20aand the radially outer-side terminals21fand21hof the radially outer-side terminals21fand21hproject toward the radially outer side of the coil end group20a. Then, the radially inner-side terminals21eand21gof the winding bodies21for forming the same phase are directly joined to each other and the radially outer-side terminals21fand21hthereof are directly joined to each other to form each phase winding.

The radially outer-side terminals21fand21hare bent in the different circumferential directions for every six slots. In the set of six radially outer-side terminals21fand six radially outer-side terminals21hin which the group of the six radially outer-side terminals21fand the group of the six radially outer-side terminals21hare adjacent to each other in the circumferential direction, each of the radially outer-side terminals21fand a corresponding one of the radially outer-side terminals21hare bent so as to be brought closer to each other. Further, in the set of the six radially outer-side terminals21fand the six radially outer-side terminals21hin which the group of the six radially outer-side terminals21fand the group of the six radially outer-side terminals21hare adjacent to each other in the circumferential direction, the first angle θ formed between the surface of the oblique-side portion of the radially outer-side terminal21f, which is oriented forward in the first circumferential direction, and the end surface of the stator core11gradually decreases in the first circumferential direction. Further, the first angle θ formed between the surface of the oblique-side portion of the radially outer-side terminal21h, which is oriented forward in the second circumferential direction, and the end surface of the stator core11gradually decreases in the second circumferential direction.

The radially inner-side terminals21eand21gare bent in the different circumferential directions for every six slots. In the set of six radially inner-side terminals21eand six radially inner-side terminals21gin which the group of the six radially inner-side terminals21eand the group of the six radially inner-side terminals21gare adjacent to each other in the circumferential direction, each of the radially inner-side terminals21eand a corresponding one of the radially inner-side terminals21gare bent so as to be brought closer to each other. Further, in the set of the six radially inner-side terminals21eand the six radially inner-side terminals21gin which the group of the six radially inner-side terminals21eand the group of the six radially inner-side terminals21gare adjacent to each other in the circumferential direction, the first angle θ formed between the surface of the oblique-side portion of the radially inner-side terminal21e, which is oriented forward in the second circumferential direction, and the end surface of the stator core11gradually decreases in the second circumferential direction. Further, the first angle θ formed between the surface of the oblique-side portion21hsof the radially inner-side terminal21g, which is oriented forward in the first circumferential direction, and the end surface of the stator core11gradually decreases in the first circumferential direction.

Accordingly, even in the fifth embodiment, the same effects as those of the first embodiment described above are obtained.

Sixth Embodiment

FIG. 26is a sectional view of a main part, for illustrating a periphery of a coil end group of a stator in a rotating electric machine according to a sixth embodiment of the present invention.

InFIG. 26, a pair of the radially inner-side terminals21eand21g, which are held in contact with each other in the radial direction, are inclined to the radially inner side, and hence the bead15is separated from the coil end group20ato the radially inner side. A pair of the radially outer-side terminals21fand21h, which are held in contact with each other in the radial direction, are inclined to the radially outer side, and hence the bead15is separated from the coil end group20ato the radially outer side.

Other configurations are the same as those of the first embodiment described above.

According to the sixth embodiment, the radially inner-side terminals21eand21gare inclined to the radially inner side, and hence the bead15serving as the connecting portion for the pair of the radially inner-side terminals21eand21gis separated from the coil end group20ato the radially inner side. The radially outer-side terminals21fand21hare inclined to the radially outer side, and hence the bead15serving as the connecting portion for the pair of the radially outer-side terminals21fand21his separated from the coil end group20ato the radially outer side. With the configuration described above, the axial height of the terminals of the winding bodies21can be reduced. Further, generation of damage of the insulating coating for the conductor wire for forming the coil ends, which may be caused by fire of a torch or sputtering at the time of joint between the pair of the radially outer-side terminals21fand21h, can be suppressed.

In the sixth embodiment, the configuration applied to the rotating electric machine according to the first embodiment has been described. However, the configuration may be applied to a rotating electric machine according to other embodiments.

Seventh Embodiment

FIG. 27is a view for illustrating a phase-to-phase insulation method for a stator winding in a rotating electric machine according to a seventh embodiment of the present invention.

In the seventh embodiment, as illustrated in part (a) ofFIG. 27, prior to a step of joining the pair of the radially inner-side terminals21eand21g, which are held in contact with each other in the radial direction, an insulating sheet16made of, for example, polyimide, aramid, polyethylene terephthalate (PET), or polyphenylene sulfide (PPS) is inserted between the radially inner-side terminals21eand21gthat form the pair from the axially outer side. In this manner, as illustrated in part (b) ofFIG. 27, the insulating sheet16is arranged between the radially inner-side terminals21eand21g, which cross each other when viewed from the radially inner side. The insulating sheet16is similarly arranged between the radially outer-side terminals21fand21h, which cross each other when viewed from the radially outer side.

Other configurations are the same as those of the first embodiment described above.

According to the seventh embodiment, the insulating sheets16are arranged between the radially inner-side terminals21eand21gof different phases, which cross each other when viewed from the radial direction, and between the radially outer-side terminals21fand21hof different phases, which cross each other when viewed from the radial direction, respectively. Thus, phase-to-phase insulation is ensured, and hence the stator having a high insulating property is obtained.

In the first to seventh embodiments described above, the winding body is formed by helically winding the conductor wire two turns. However, the number of turns of the conductor wire is not limited to two, and may be any number equal to or larger than two.

In the seventh embodiment, the configuration applied to the rotating electric machine according to the first embodiment has been described. However, the configuration may be applied to a rotating electric machine according to other embodiments.

Eighth Embodiment

FIG. 28is a perspective view for illustrating a stator to be applied to a rotating electric machine according to an eighth embodiment of the present invention.FIG. 29is a perspective view for illustrating a core block for forming a stator core to be applied to the rotating electric machine according to the eighth embodiment of the present invention.FIG. 30is a front view for illustrating a first winding body for forming a stator winding in the rotating electric machine according to the eighth embodiment of the present invention.FIG. 31is a plan view for illustrating the first winding body for forming the stator winding in the rotating electric machine according to the eighth embodiment of the present invention.FIG. 32is a front view for illustrating a second winding body for forming the stator winding in the rotating electric machine according to the eighth embodiment of the present invention.FIG. 33is a plan view for illustrating the second winding body for forming the stator winding in the rotating electric machine according to the eighth embodiment of the present invention.FIG. 34is a sectional view of a main part, for schematically illustrating a state in which the winding bodies are accommodated in slots in the rotating electric machine according to the eighth embodiment of the present invention.FIG. 35is a perspective view for illustrating a winding assembly for forming the stator winding in the rotating electric machine according to the eighth embodiment of the present invention.FIG. 36is a side view of a main part, for illustrating the stator in the rotating electric machine according to the eighth embodiment of the present invention when viewed from a radially outer side.FIG. 37is a view for illustrating bending shapes of radially outer-side terminals of the stator winding in the rotating electric machine according to the eighth embodiment of the present invention. InFIG. 36andFIG. 37, only the radially outer-side terminals are illustrated.

InFIG. 28a stator10A includes a stator core30having an annular shape, a stator winding40mounted to the stator core30, and slot cells13. The slot cells13electrically separate the stator winding40and the stator core30from each other. For convenience of the description, a pole number p is set to 10, a slot number of the stator core30is set to 60, and a three-phase winding is set as the stator winding20. Specifically, the slots are formed in the stator core30in a proportion of two slots per phase for each pole.

A core block31is obtained by, as illustrated inFIG. 29, equally dividing the stator core30having the annular shape into thirty blocks in a circumferential direction of the stator core30. The core block31is formed by stacking and integrating a plurality of electromagnetic steel sheets. The core block31includes a core back portion31ahaving an arc-shaped cross section and two teeth31bprojecting radially inward from an inner peripheral wall surface of the core back portion31a. The stator core30is formed into the annular shape by arranging and integrating thirty core blocks31in the circumferential direction while the teeth31bare oriented radially inward and circumferential side surfaces of the core back portions31aabut against each other. Slots32formed between the core blocks31adjacent to each other in the circumferential direction are arranged at equiangular pitches in the circumferential direction so as to be open toward an inner peripheral side. Each of the teeth31bis formed into a tapered shape having a circumferential width gradually decreasing to a radially inner side. A cross section of each of the slots32, which is orthogonal to an axial direction of the stator core30, is rectangular. As described above, the stator core30has the same configuration as that of the stator core11described above except that the stator core30is formed into the annular shape by arranging the thirty core blocks31in the circumferential direction.

Winding bodies42for forming the stator winding40include first winding bodies42A and a second winding bodies42B. In the first winding bodies42and the second winding bodies42B, terminals extend in different directions. Each of the first winding body42A and the second winding body42B is formed by inserting a conductor wire39having a circular cross section with the diameter d, which is formed of, for example, a copper wire or an aluminum wire, which is insulation-coated with an enamel resin and is continuous without any connecting portions, into a first slot, a second slot, and a third slot, which are arranged at six-slot-angle distances in the circumferential direction. The conductor wire39is inserted into the first slot, the second slot, the third slot, and the second slot in the started order so that an insertion direction into the first slot, the second slot, and the third slot from an axial direction are changed alternately to form each of the first winding body42A and the second winding body42B into a δ-shaped coil pattern. The winding body42may also be formed with use of a conductor wire having a rectangular cross section in place of the conductor wire39having the circular cross section.

The first winding body42A includes, as illustrated inFIG. 30andFIG. 31, a first straight portion42a, a second straight portion42b, a third straight portion42c, a fourth straight portion42d, a first coil end42e, a second coil end42f, a third coil end42g, a radially outer-side terminal42h, and a radially inner-side terminal42i. The first straight portion42a, the second straight portion42b, the third straight portion42c, and the fourth straight portion42dare arranged in three rows arranged at six-slot-angle distances. The first coil end42econnects one end of the first straight portion42ain a length direction and one end of the second straight portion42bin the length direction to each other. The second coil end42fconnects another end of the second straight portion42bin the length direction and another end of the third straight portion42cin the length direction to each other. The third coil end42gconnects one end of the third straight portion42cin the length direction and one end of the fourth straight portion42din the length direction to each other. The radially outer-side terminal42hextends from another end of the first straight portion42ain the length direction. The radially inner-side terminal42iextends from another end of the fourth straight portion42din the length direction. The six-slot-angle distance corresponds to one magnetic-pole pitch.

More specifically, the first winding body42A is formed into the δ-shaped coil pattern in the following manner, as illustrated inFIG. 34. The conductor wire39is inserted into a first layer inside a first slot32from one axial end side of the stator core30, extends from the first slot32to another axial side of the stator core30to be inserted into a second layer in a seventh slot32, which is separate by the six-slot-angle distance in the second circumferential direction, extends from the seventh slot32to the one axial end side of the stator core30to be inserted into a third layer in a thirteenth slot32, which is separate by the six-slot-angle distance in the second circumferential direction, extends from the thirteenth slot32to the another axial end side of the stator core30to be inserted into a fourth layer in the seventh slot32, which is separate by the six-slot-angle distance in the first circumferential direction, and extends from the seventh slot32to the one axial end side of the stator core30.

Positions of accommodation of the conductor wire39accommodated in the slot32are referred to as the first layer, the second layer, the third layer, and the fourth layer from the radially outer side for convenience. InFIG. 34, the numbers1,2. . .12, and13are slot numbers allocated to the slots32in the order of arrangement in the circumferential direction.

The first straight portion42ais accommodated in the first layer in the first slot32, the second straight portion42band the fourth straight portion42dare accommodated in the second layer and the fourth layer in the seventh slot32, and the third straight portion42cis accommodated in the third layer in the thirteenth slot32. Specifically, the first straight portion42a, the second straight portion42b, the third straight portion42c, and the fourth straight portion42dare arranged in the three rows located at the six-slot-angle distances.

The first coil end42eextending from the first layer in the first slot32to the another axial end side of the stator core30extends axially outward to another circumferential side at a constant inclination while maintaining a radial position, is displaced radially inward by d at a center (top), and then extends axially inward in the second circumferential direction at an inclination in the opposite direction while maintaining the radial position to be inserted into the second layer in the seventh slot32.

The second coil end42fextending from the second layer in the seventh slot32to the one axial end side of the stator core30extends axially outward in the second another circumferential direction at a constant inclination while maintaining a radial position, is displaced radially inward by d at a center (top), and then extends axially inward in the second circumferential direction at an inclination in the opposite direction while maintaining the radial position to be inserted into the third layer in the thirteenth slot32.

The third coil end42gextending from the third layer in the thirteenth slot32to the another axial end side of the stator core30extends axially outward in the first circumferential direction at a constant inclination while maintaining a radial position, is displaced radially inward by d at a center (top), and then extends axially inward in the first circumferential direction at an inclination in the opposite direction while maintaining the radial position to be inserted into the fourth layer in the seventh slot32.

As described above, each of the first coil end42e, the second coil end42f, and the third coil end42ghas a crank portion, which is displaced in the radial direction by the radial width of the conductor wire39, at the top.

The radially outer-side terminal42h, which extends from the first layer in the first slot32to the one axial end side of the stator core30, as illustrated inFIG. 30andFIG. 31, is bent at a displacement portion42jto be displaced radially outward by d, then extends radially outward in the second circumferential direction at a constant inclination while maintaining a radial position, and is bent at an approximate center (top) to extend axially outward.

The radially inner-side terminal42i, which extends from the fourth layer in the seventh slot32to the one axial end side of the stator core30, as illustrated inFIG. 30andFIG. 31, extends radially outward in the first circumferential direction at a constant inclination while maintaining a radial position, and is bent at an approximate center (top) to extend axially outward.

The second winding body42B includes, as illustrated inFIG. 32andFIG. 33, the first straight portion42a, the second straight portion42b, the third straight portion42c, the fourth straight portion42d, the first coil end42e, the second coil end42f, the third coil end42g, a radially outer-side terminal42k, and a radially inner-side terminal42m. The first straight portion42a, the second straight portion42b, the third straight portion42c, and the fourth straight portion42dare arranged in three rows arranged at six-slot-angle distances. The first coil end42econnects the one end of the first straight portion42ain the length direction and the one end of the second straight portion42bin the length direction to each other. The second coil end42fconnects the another end of the second straight portion42bin the length direction and the another end of the third straight portion42cin the length direction to each other. The third coil end42gconnects one end of the third straight portion42cin the length direction and the one end of the fourth straight portion42din the length direction to each other. The radially outer-side terminal42kextends from the another end of the first straight portion42ain the length direction. The radially inner-side terminal42mextends from the another end of the fourth straight portion42din the length direction. The second winding body42B is formed into a δ-shaped coil pattern. Specifically, the second winding body42B is formed to have the same configuration as that of the first winding body42A except for the radially outer-side terminal42kand the radially inner-side terminal42m.

In the second winding body42B, similarly to the first winding body42A, the first straight portion42ais accommodated in the first layer in the first slot32, the second straight portion42band the fourth straight portion42dare accommodated in the second layer and the fourth layer in the seventh slot32, and the third straight portion42cis accommodated in the third layer in the thirteenth slot32.

The radially outer-side terminal42k, which extends from the first layer in the first slot32to the one axial end side of the stator core30, as illustrated inFIG. 32andFIG. 33, extends axially outward in the first circumferential direction at a constant inclination while maintaining a radial position, and is bent at an approximate center (top) to extend axially outward.

The radially inner-side terminal42m, which extends from the fourth layer in the seventh slot32to the one axial end side of the stator core30, as illustrated inFIG. 32andFIG. 33, is bent at a displacement portion42jto be displaced radially inward by d, then extends radially outward in the second circumferential direction at a constant inclination while maintaining a radial position, and is bent at an approximate center (top) to extend axially outward.

The first winding bodies42A and the second winding bodies42B, which are formed as described above, are arranged in the circumferential direction at one-slot pitches so that a group of six first winding bodies42A and a group of six second winding bodies42B are arranged alternately in the circumferential direction to thereby form a winding assembly41having an annular shape, which is illustrated inFIG. 35. The winding assembly41includes thirty first winding bodies42A and thirty second winding bodies42B.

In the winding assembly41formed as described above, the first straight portion42a, the second straight portion42b, the third straight portion42c, and the fourth straight portion42dare arranged in one row in the radial direction, and sixty rows are arranged in the circumferential direction at one-slot pitches.

On one axial end side of the winding assembly41, a second coil end row formed by arranging the second coil ends42fin the circumferential direction at one-slot pitches forms a first coil end group41a. On another axial end side of the winding assembly41, a second coil end group41bis formed. The second coil end group41bincludes a first coil end row and a third coil end row, which are two rows arranged in the radial direction. The first coil end row is formed by arranging the first coil ends42ein the circumferential direction at one-slot pitches. The third coil end row is formed by arranging the third coil ends42gin the circumferential direction at one-slot pitches.

Each terminal pair includes the first winding body42A and the second winding body42B, which are separate from each other by 180 degrees in electrical angle so that an end of the radially outer-side terminal42hof the first winding body42A and an end of the radially outer-side terminal42kof the second winding body42B are held in contact with each other in the radial direction. Four sets, each including the six terminal pairs described above arranged in the circumferential direction, are arranged on the radially outer side of the first coil end group41aso as to be separate from each other in the circumferential direction. Further, each terminal pair includes the first winding body42A and the second winding body42B, which are separate from each other by 180 degrees in electrical angle so that an end of the radially inner-side terminal42iof the first winding body42A and an end of the radially inner-side terminal42mof the second winding body42B are held in contact with each other in the radial direction. Five sets, each including the six terminal pairs described above arranged in the circumferential direction, are arranged on the radially inner side of the first coil end group41aso as to be separate from each other in the circumferential direction.

In the set of six terminal pairs arranged in the circumferential direction, in which the distal end portions of the radially outer-side terminals42hof the first winding bodies42A and the distal end portions of the radially outer-side terminals42kof the second winding bodies42B, which are separate from each other by 180 degrees in electrical angle, are arranged so as to be held in contact with each other in the radial direction, as illustrated inFIG. 36, an oblique-side portion42hsof each of the radially outer-side terminals42hand an oblique-side portion42hsof a corresponding one of the radially outer-side terminals42kcross each other when viewed from the radially outer side. Specifically, the oblique-side portions42hsof the radially outer-side terminals42hof the first winding bodies42A, which extend from the slots, are bent in the second circumferential direction. Meanwhile, the oblique-side portions42ksof the radially outer-side terminals42kof the second winding bodies42B, which extend from the slots, are bent in the first circumferential direction.

More specifically, as illustrated inFIG. 37, when six radially outer-side terminals42kof each of the sets are denoted as a radially outer-side terminal42k1, a radially outer-side terminal42k2, a radially outer-side terminal42k3. . . , and a radially outer-side terminal42k6in the order of arrangement in the first circumferential direction for convenience, the first angle θ formed between the oblique-side portion42ksof each of the radially outer-side terminals42k1,42k2,42k3. . . , and42k6, which is oriented forward in the first circumferential direction, and the end surface of the stator core11is constant. Second angles η1, η2, η3. . . , and η6respectively formed between distal end portions42kaof the radially outer-side terminals42k1,42k2,42k3. . . , and42k6, which are oriented in the first circumferential direction, and the end surface of the stator core11have a relationship of: η1>η2>η3. . . >η6. Specifically, the second angle η gradually decreases in the first circumferential direction. A height position of a bent portion of the oblique-side portion42ks, at which the distal end portion42kaof the radially outer-side terminal42kis defined, from the end surface of the stator core11is set so as to gradually decrease in the first circumferential direction.

Meanwhile, when six radially outer-side terminals42hof each of the sets are denoted as a radially outer-side terminal42h1, a radially outer-side terminal42h2, a radially outer-side terminal42h3. . . , and a radially outer-side terminal42h6in the order of arrangement in the second circumferential direction for convenience, the first angle θ formed between the oblique-side portion42hsof each of the radially outer-side terminals42h1,42h2,42h3. . . , and42h6, which is oriented forward in the second circumferential direction, and the end surface of the stator core11is constant. The second angle η formed between a surface of a distal end portion42haof the radially outer-side terminal42h1,42h2,42h3. . . , and42h6, which is oriented forward in the second circumferential direction, and the end surface of the stator core11gradually decreases in the second circumferential direction. A height position of a bent portion of the oblique-side portion42hs, at which the distal end portion42haof the radially outer-side terminal42his defined, from the end surface of the stator core11is set so as to gradually decrease in the second circumferential direction.

A distal end portion42haof the radially outer-side terminal42kand a distal end portion42kaof the radially outer-side terminal42h, which are held in contact with each other in the radial direction, are located at the same height position from the end surface of the stator core11.

Although not illustrated, even in the sets, each including six terminal pairs arranged in the circumferential direction so that the distal end portion of the radially inner-side terminal42iof the first winding body42A and the distal end portion of the radially inner-side terminal42mof the second winding body42B of each terminal pair, which are separate from each other by 180 degrees in electrical angle, are held in contact with each other in the radial direction, an oblique-side portion of each of the radially inner-side terminals42iand an oblique-side portion of a corresponding one of the radially inner-side terminals42mcross each other when viewed from the radially inner side.

More specifically, although not illustrated, when six radially inner-side terminals42iof each of the sets are denoted as a radially inner-side terminal42i1, a radially inner-side terminal42i2, a radially inner-side terminal42i3. . . , and a radially inner-side terminal42i6in the order of arrangement in the first circumferential direction for convenience, the first angle θ formed between the oblique-side portion of each of the radially inner-side terminals42i1,42i2,42i3. . . , and42i6, which is oriented forward in the first circumferential direction, and the end surface of the stator core11is constant. The second angle η formed between a surface of a distal end portion of the radially outer-side terminal42i1,42i2,42i3. . . , and42i6, which is oriented forward in the first circumferential direction, and the end surface of the stator core11gradually decreases in the first circumferential direction. A height position of a bent portion of the oblique-side portion, at which the distal end portion of the radially inner-side terminal42iis defined, from the end surface of the stator core11is set so as to gradually decrease in the first circumferential direction.

More specifically, although not illustrated, when six radially inner-side terminals42mof each of the sets are denoted as a radially inner-side terminal42m1, a radially inner-side terminal42m2, a radially inner-side terminal42m3. . . , and a radially inner-side terminal42m6in the order of arrangement in the second circumferential direction for convenience, the first angle θ formed between the oblique-side portion of each of the radially inner-side terminals42m1,42m2,42m3. . . , and42m6, which is oriented forward in the second circumferential direction, and the end surface of the stator core11is constant. The second angle η formed between a surface of a distal end portion of the radially inner-side terminal42m1,42m2,42m3. . . , and42m6, which is oriented forward in the second circumferential direction, and the end surface of the stator core11gradually decreases in the second circumferential direction. A height position of a bent portion of the oblique-side portion, at which the distal end portion of the radially inner-side terminal42mis defined, from the end surface of the stator core11is set so as to gradually decrease in the second circumferential direction.

A distal end portion21faof the radially inner-side terminal42iand a distal end portion21haof the radially inner-side terminal42m, which are held in contact with each other in the radial direction, are located at the same height position from the end surface of the stator core11.

Next, an assembly method for the stator10A is described with reference toFIG. 38andFIG. 39.FIG. 38andFIG. 39are views for illustrating an assembly method for the stator in the rotating electric machine according to the eighth embodiment of the present invention.FIG. 38is an illustration of a state before assembly of the stator, andFIG. 39is an illustration of a state after the assembly of the stator.

First, the slot cells13are mounted to the rows, each including the first straight portion42a, the second straight portion42b, the third straight portion42c, and the fourth straight portion42d, in the winding assembly41. Next, the thirty core blocks31are arranged, as illustrated inFIG. 38, at approximately equiangular pitches in the circumferential direction so that the teeth31bare arranged on the radially outer side of spaces between adjacent ones of the rows, each including the first straight portion42a, the second straight portion42b, the third straight portion42c, and the fourth straight portion42d, in the winding assembly41. Subsequently, the core blocks31arranged in the circumferential direction are moved radially inward. As a result, each of the teeth31bof the core blocks31is inserted between the adjacent ones of the rows, each including the first straight portion42a, the second straight portion42b, the third straight portion42c, and the fourth straight portion42d.

The core blocks31arranged in the circumferential direction is moved further to the radially inner side. Then, circumferential side surfaces of adjacent ones of the core blocks31are brought into abutment against each other to hamper radially inward movement of the core blocks31. As a result, as illustrated inFIG. 39, the winding assembly41is mounted to the stator core30. Subsequently, the insulating sheets16are inserted between the radially inner-side terminals42iand42m, which are held in contact with each other in the radial direction, and between the radially outer-side terminals42hand42k, which are held in contact with each other in the radial direction. Subsequently, wire connection processing is performed for the winding assembly41as in the case of the first embodiment described above to thereby assemble the stator10A.

Although not shown, a distance from an end surface of the stator core30to a bending start position (bending position in the circumferential direction) on the radially outer-side terminal42kis longer than a distance from the end surface of the stator core30to a bending start position (bending position in the circumferential direction) at the displacement portion42jof the radially outer-side terminal42h. Further, a distance from the end surface of the stator core30to a bending start position (bending position in the circumferential direction) on the radially inner-side terminal42iis longer than a distance from the end surface of the stator core30to a bending start position (bending position in the circumferential direction) at the displacement portion42jof the radially inner-side terminal42m.

According to the eighth embodiment, the same number as a total number of slots winding bodies42formed by distributed winding are mounted in the stator core30at one-slot pitches. Then, the winding bodies42are formed so that the radially inner-side terminals42iand42m, each being one end of the conductor39, extend from a radially innermost position in the slot32toward the one axial side of the stator core30and the radially outer-side terminals42hand42k, each being another end of the conductor39, extend from a radially outermost position in the slot32toward the one axial side of the stator core30. Further, each phase winding of the stator winding40is formed by directly joining the radially inner-side terminals42iand42mof the winding bodies42for forming the same phase to each other and directly joining the radially outer-side terminals42hand42kthereof to each other.

Therefore, also in the eighth embodiment, the radially inner-side terminals42iand42mand the radially outer-side terminals42hand42kare not required to be caused to pass on an axially outer side of the first coil end group a. Thus, an axial dimension of the stator10can be reduced.

Further, another component such as a bus bar, which is configured to connect the terminals of the winding bodies42to each other, is not required. Thus, the number of components of the stator10A can be reduced.

Further, the radially inner-side terminal42iof the first winding body42A maintains the fourth radial position from the radially outer side in the slot32, and the radially outer-side terminal42his displaced radially inward from the first radial position from the radially outer side in the slot32by the width d of the conductor wire39. The radially inner-side terminal42mof the second winding body42B is displaced radially inward from the fourth radial position from the radially outer side in the slot32by the width d of the conductor39, and the radially outer-side terminal42kmaintains the first radial position from the radially outer side in the slot32. In this manner, the radially inner-side terminal42ican be led in the circumferential direction to be joined to a corresponding one of the radially inner-side terminals42mwithout interference of the radially inner-side terminals42m. Further, the radially outer-side terminal42hcan be led in the circumferential direction to be joined to a corresponding one of the radially outer-side terminals42kwithout interference of the radially outer-side terminals42k. Thus, radial projection of the second coil end group41bcan be reduced.

Six radially outer-side terminals42kand six radially outer-side terminal42h, which extend from the radially outermost position in the slots12, are arranged so that a group of the six radially outer-side terminals42kand a group of the six radially outer-side terminals42hare arranged alternately in the circumferential direction. The six radially outer-side terminals42kextend from the slots12and are then bent in the first circumferential direction. The six radially outer-side terminals42hextend from the slots12and are then bent in the second circumferential direction so as to be brought closer to the radially outer-side terminals42kbeing targets to be connected, which are separate from the radially outer-side terminals42kby six slots, to be connected to the radially outer-side terminals42kbeing the targets to be connected. Specifically, the radially outer-side terminals42kand42hare bent in the different circumferential directions for every six slots. In the set of six radially outer-side terminals42kand six radially outer-side terminals42hin which the group of the six radially outer-side terminals42kand the group of the six radially outer-side terminals42hare adjacent to each other in the circumferential direction, each of the radially outer-side terminals42kand a corresponding one of the radially outer-side terminals42hare bent so as to be brought closer to each other. Further, in the set of the radially outer-side terminals42kand the radially outer-side terminals42h, which are arranged so that a group of six radially outer-side terminals42kand a group of six radially outer-side terminals42hare adjacent to each other in the circumferential direction, the second angle η formed between the distal end portion42kaof the radially outer-side terminal42kand the end surface of the stator core11gradually decreases in the first circumferential direction, which is a bending direction of the oblique-side portions42ksof the radially outer-side terminals42k. Further, the second angle η formed between the distal end42haof the radially outer-side terminal42hand the end surface of the stator core11gradually decreases in the second circumferential direction, which is a bending direction of the oblique-side portions42hsof the radially outer-side terminals42h. As a result, a distance between the connecting portions, each being formed between the distal end portion42haof the radially outer-side terminal42hand the distal end portion42kaof the radially outer-side terminal42kadjacent to each other, which are held in contact with each other in the radial direction, can be increased. Thus, the insulating property can be improved.

Six radially inner-side terminals42iand six radially inner-side terminal42m, which extend from the radially innermost position in the slots12, are arranged so that a group of the six radially inner-side terminals42iand a group of the six radially inner-side terminals42mare arranged alternately in the circumferential direction. The six radially inner-side terminals42iextend from the slots12and are then bent in the first circumferential direction. The six radially inner-side terminals42mextend from the slots12and are then bent in the second circumferential direction so as to be brought closer to the radially inner-side terminals42ibeing targets to be connected, to be connected to the radially inner-side terminals42ibeing the targets to be connected. Specifically, the radially inner-side terminals42iand42mare bent in the different circumferential directions for every six slots. In the set of six radially inner-side terminals42iand six radially inner-side terminals42min which the group of the six radially inner-side terminals42iand the group of the six radially inner-side terminals42mare adjacent to each other in the circumferential direction, each of the radially inner-side terminals42iand a corresponding one of the radially inner-side terminals42mare bent so as to be brought closer to each other. Further, in the set of the radially inner-side terminals42iand the radially inner-side terminals42m, which are arranged so that a group of six radially outer-side terminals42iand a group of six radially outer-side terminals42mare adjacent to each other in the circumferential direction, the second angle η formed between the distal end portion of the radially inner-side terminal42iand the end surface of the stator core11gradually decreases in the first circumferential direction, which is a bending direction of the oblique-side portions of the radially inner-side terminals42i. Further, the first angle θ formed between the distal end of the radially inner-side terminal42mand the end surface of the stator core11gradually decreases in the second circumferential direction, which is a bending direction of the oblique-side portions of the radially inner-side terminals42m. As a result, a distance between the connecting portions, each being formed between the distal end portion of the radially inner-side terminal42iand the distal end portion of the radially inner-side terminal42adjacent to each other, which are held in contact with each other in the radial direction, can be increased. Thus, the insulating property can be improved.

In the eighth embodiment described above, the second angle η formed between the distal portion of the radially outer-side terminal and the end surface of the stator core and between the distal portion of the radially inner-side terminal and the end surface of the stator core gradually decreases in a direction of being brought closer to the terminal to be joined. When insulating performance has a margin, the second angle η may be the same for a plurality of the oblique-side portions as long as the second angle η monotonously decreases in the direction of being brought closer to the terminal to be joined. For example, inFIG. 37, the second angles η1to η6may have a relationship of: η1=η2>η3>η4>η5>η6. Further, a potential difference between the terminals of the same phase is small. Thus, in a portion in which the terminals of the same phase are adjacent to each other in the circumferential direction, the second angle η may be set to the same angle.

Ninth Embodiment

FIG. 40is a side view of a main part, for illustrating a stator in a rotating electric machine according to a ninth embodiment of the present invention when viewed from a radially outer side. FIG.41is a view for illustrating bending shapes of radially outer-side terminals of a stator core in the rotating electric machine according to the ninth embodiment of the present invention. InFIG. 40andFIG. 41, only the radially outer-side terminal are illustrated.

In the set of six terminal pairs arranged in the circumferential direction, in which the distal end portions of the radially outer-side terminals42haof the first winding bodies42A and the distal end portions42kaof the radially outer-side terminals42kof the second winding bodies42B, which are separate from each other by 180 degrees in electrical angle, are arranged so as to be held in contact with each other in the radial direction, as illustrated inFIG. 40andFIG. 41. An oblique-side portion42fsof each of the radially outer-side terminals42hand an oblique-side portion42ksof a corresponding one of the radially outer-side terminals42hcross each other when viewed from the radially outer side. Specifically, the oblique-side portions42hsof the radially outer-side terminals42hof the first winding bodies42A, which extend from the slots, are bent in the second circumferential direction. Meanwhile, the oblique-side portions42ksof the radially outer-side terminals42kof the second winding bodies42B, which extend from the slots, are bent in a first circumferential direction.

The first angle θ formed between the surface of the oblique-side portion42ksof each of the six radially outer-side terminals42kof each set, which is oriented forward in the first circumferential direction, and the end surface of the stator core11gradually decreases in the first circumferential direction. The second angle η formed between the surface of the oblique-side portion42kaof the radially outer-side terminal42k, which is oriented forward in the first circumferential direction, and the end surface of the stator core11gradually decreases in the first circumferential direction. Further, the height position of the bent portion of the oblique-side portion42ks, at which the distal end portion42kaof the radially outer-side terminal42kis defined, from the end surface of the stator core11is gradually decreased in the first circumferential direction.

Meanwhile, the first angle θ formed between the surface of the oblique-side portion42hsof each of the six radially outer-side terminals42hof each set, which is oriented forward in the second circumferential direction, and the end surface of the stator core11gradually decreases in the second circumferential direction. The second angle η formed between the surface of the oblique-side portion42haof the radially outer-side terminal42h, which is oriented forward in the second circumferential direction, and the end surface of the stator core11gradually decreases in the second circumferential direction. Further, the height position of the bent portion of the oblique-side portion42hs, at which the distal end portion42haof the radially outer-side terminal42his defined, from the end surface of the stator core11is gradually decreased in the first circumferential direction.

A distal end portion42kaof the radially outer-side terminal42kand a distal end portion42haof the radially outer-side terminal42h, which are held in contact with each other in the radial direction, are located at the same height position from the end surface of the stator core11.

Although not illustrated, even in the sets, each including six terminal pairs arranged in the circumferential direction so that the distal end portion of the radially inner-side terminal42iof the first winding body42A and the distal end portion of the radially inner-side terminal42mof the second winding body42B of each terminal pair, which are separate from each other by 180 degrees in electrical angle, similarly, an oblique-side portion of each of the radially inner-side terminals42iand an oblique-side portion of a corresponding one of the radially inner-side terminals42mcross each other when viewed from the radially inner side.

The first angle θ formed between the surface of the oblique-side portion of each of the six radially outer-side terminals42iof each set, which is oriented forward in the first circumferential direction, and the end surface of the stator core11gradually decreases in the first circumferential direction. The second angle η formed between the surface of the oblique-side portion of the radially outer-side terminal42i, which is oriented forward in the first circumferential direction, and the end surface of the stator core11gradually decreases in the first circumferential direction. Further, the height position of the bent portion of the oblique-side portion, at which the distal end portion of the radially outer-side terminal42iis defined, from the end surface of the stator core11is gradually decreased in the first circumferential direction.

The first angle θ formed between the surface of the oblique-side portion of each of the six radially outer-side terminals42mof each set, which is oriented forward in the second circumferential direction, and the end surface of the stator core11gradually decreases in the second circumferential direction. The second angle η formed between the surface of the oblique-side portion of the radially outer-side terminal42m, which is oriented forward in the second circumferential direction, and the end surface of the stator core11gradually decreases in the second circumferential direction. Further, the height position of the bent portion of the oblique-side portion, at which the distal end portion of the radially outer-side terminal42mis defined, from the end surface of the stator core11is gradually decreased in the second circumferential direction.

Further, a distal end portion of the radially outer-side terminal42iand a distal end portion of the radially outer-side terminal42m, which are held in contact with each other in the radial direction, are located at the same height position from the end surface of the stator core11.

Other configurations are the same as those of the eighth embodiment described above.

Accordingly, even in the ninth embodiment, the same effects as those of the eighth embodiment described above are obtained.

According to the ninth embodiment, the first angle θ formed between the surface of the oblique-side portion42ksof each of the six radially outer-side terminals42kof each set and the end surface of the stator core11gradually decreases in the first circumferential direction, which is the bending direction of the oblique-side terminals42ksof the radially outer-side terminals42k. Thus, a distance between the oblique-side portions42ksof the radially outer-side terminals42kadjacent to each other is increased to improve the insulating property. Similarly, the first angle θ formed between the surface of the oblique-side portion42hsof each of the six radially outer-side terminals42hof each set and the end surface of the stator core11gradually decreases in the second circumferential direction, which is the bending direction of the oblique-side portions42hsof the radially outer-side terminals42h. Thus, a distance between the oblique-side portions42hsof the radially outer-side terminals42hadjacent to each other is increased to improve the insulating property. The first angle θ formed between the oblique-side portion of each of the six radially inner-side terminals42iof each set and the end surface of the stator core11gradually decreases in the first circumferential direction, which is the bending direction of the oblique-side portions of the radially inner-side terminals42i. Thus, a distance between the oblique-side portions of the radially inner-side terminals42iadjacent to each other is increased to improve the insulating property. Similarly, the first angle θ formed between the oblique-side portion of each of the six radially inner-side terminals42mof each set and the end surface of the stator core11gradually decreases in the second circumferential direction, which is the bending direction of the oblique-side portions of the radially inner-side terminals42m. Thus, a distance between the oblique-side portions of the radially inner-side terminals42madjacent to each other is increased to improve the insulating property.

In the eighth and ninth embodiments described above, the application of the present invention to the stator using the winding bodies42has been described. However, the present invention may be applied to the stator using the winding bodies21.

In the eighth and ninth embodiments described above, each of the winding bodies42is formed by continuously winding the conductor wire39one turn into the δ-shaped coil pattern. However, the winding body may be formed by winding the conductor wire39two or more turns into the δ-shaped coil pattern. Specifically, the winding body may be formed by arranging the δ-shaped coil patterns (winding bodies42) in two or more rows in the radial direction so as to be continuously formed with use of a jumper wire for connecting winding ends of the δ-shaped coil patterns.

In each of the embodiments described above, the application of the rotating electric machine to the electric motor has been described. However, the same effects are provided even when the rotating electric machine is applied to a power generator.

Further, in each of the embodiments described above, the rotating electric machine having ten poles and sixty slots has been described above. However, the pole number p and the slot number S are not limited to ten poles and sixty slots.

In each of the embodiments described above, the slots are formed in a proportion of two slots per phase for each pole. However, a slot number q per phase for each pole is not limited to two, and may be one, or three or more. For example, the slot number q per phase for each pole is one, a distance between the row of the first straight portion and the row of the second straight portion of the winding bodies is a three-slot-angle distance (one magnetic-pole pitch). In this case, the bending direction of the radially outer-side terminal extending from the radially outermost position of the slot is different in the circumferential direction for every three slots.

In each of the embodiments described above, each of the winding bodies is formed as a winding formed by full-pitch winding. However, each of the winding bodies may be formed as a winding formed by fractional-pitch winding or long-pitch winding.

In each of the embodiments described above, the winding body is formed of one continuous conductor wire. However, the winding body may be formed with use of a plurality of conductors connected to each other as long as distributed winding is used.

Further, in each of the embodiments described above, vanish is not applied to the coil end group. However, vanish may be applied to the coil end group. As a result, firm fixation between the radially outer-side terminals, between the radially inner-side terminals, and between the radially outer-side terminals and the radially inner-side terminals, and the coil end group is achieved. Therefore, the radially outer-side terminals are not brought closer to each other and the radially inner-side terminals are not brought closer to each other due to vibration. Thus, the insulating property is improved.

REFERENCE SIGNS LIST