Armature core wire winding method

Abstract: An armature core wire winding method in which the armature core has salient poles set to be an integral multiple number of three, the salient poles protruded radially from an axial core portion of the armature core, the method comprises the steps of; winding three translation wires in two stages round three salient poles, respectively, the three salient poles being included into a first block; drawing out three transition wires from the three salient poles of the first block, respectively, in such a manner that each transition wire is drawn out at one surface side of the salient poles; extending the transition wires in such a manner that the transition wires pass over two adjoining the salient poles; winding the transition wires round salient poles of a second block, respectively, each salient pole of the second block corresponding to each salient pole of the first block; and repeating the winding step to the winding step until the transition wires completely wind round the salient poles.

Description: BACKGROUND OF THE INVENTION The present invention relates to an armature core wire winding method in which the winding operation of wires to be simultaneously wound round a plurality of salient poles forming a block is performed successively in each block. Generally, in a revolving electric machine having a multipolar core or a similar machine, wires are wound in line by a nozzle-type winding machine. In more particular, a large number of salient poles are divided into a plurality of blocks and after then the wire winding is carried out in each block. For example, in an armature core 1 having three phases comprising a U phase, a V phase and a W phase shown in Figs. 11 and 12, a large number of salient poles 3 are protruded radially from the outer peripheral surfaces of an axial core portion 2. The number of these salient poles are set to be the integral multiple number of 3 and three mutually adjoining salient poles form a block. When the wires are actually wound round the respective salient poles 3, three wires 4, 5 and 6 are wound simultaneously round the respective salient poles U1, V1 and W1 in a block 3a. The winding of the wires round the respective salient poles 3 is performed, for example, in two stages, and the wires are wound up to such height as corresponding to the stages of the winding. After completion of the winding, from the respective salient poles U1, V1 and W1 in the above-mentioned first block 3a, there are drawn out transition wires 4a, 5a and 6a going to the salient poles of a second block 3b, respectively. In particular, these transition wires 4a, 5a and 6a are put in line on the upper surface (the right surface in Fig. 12) of the core. The transition wires 4a, 5a and 6a from the respective salient poles U1, V1 and W1 are passed over the upper surfaces of the two adjoining salient poles and are guided to their corresponding salient poles U2, V2 and W2 in the next or second block 3b, so that the wire winding can be performed. After then, from the respective salient poles U2, V2 and W2 of the second block 3b, transition wires 4b, 5b and 6b are drawn out toward the core upper surface (the right surface in Fig. 12). By repeating these winding operations, the winding of the wires round the 3-phase armature core 1 can be completed. However, in the above-mentioned conventional wire winding method, the respective transition wires (4a, 5a, 6a, ---) of the wires 4, 5 and 6 in the above-mentioned three systems, especially as shown in Fig. 12, are superimposed on another in three stages. The height of the three-stage superimposed transition wires is greater than the height of the two-stage superimposed wires wound round the respective salient poles 3. In other words, according to the conventional wire winding method, because the transition wires of he wires 4 intersect with one another at many points, the thickness of the whole core wired is great, which provides a problem in producing the revolving electric machine in a thinner configuration. Such conventional wire winding methods are disclosed in EP-A-0 291 219. There is described a compact 3-phase permanent magnet rotary machine having minimal reluctance torque and electromagnetic torque ripple, and maximum energy efficiency and starting torque per unit volume of winding. This machine, however, shows 3-stage superimposed transition wires, and therefore the thickness of the whole core wired is typically great. SUMMARY OF THE INVENTION It is an object of the invention to provide an armature core wire winding method which is capable of winding wires properly without intersecting the transition wires of core wires with one another so as to obtain a thin, revolving electric machine. In order to achieve the above object, according to the invention, there is provided an armature core wire winding method as described in claim 1. Alternaltively, the above object, according to the invention, is also achieved by an armature core winding method as described in claim 7. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is an explanatory plan view of an armature core of a first embodiment of the invention; Fig. 2 is a transverse section view taken along the line II-II in Fig. 1; Fig. 3 is an explanatory, transverse section view of a spindle motor as an example of rotary electric machines to which the present invention is applied; Fig. 4 is a developmental view showing an embodiment of the present invention; Fig. 5 is a developmental view showing an embodiment of another embodiment of the present invention; Fig. 6 is an explanatory plan view of an armature core of a second embodiment of the present invention; Fig. 7 is an explanatory plan view of an armature core of a third embodiment of the present invention; Fig. 8 is an explanatory plan view of an armature core of a forth embodiment of the present invention; Fig. 9 is an explanatory plan view of an armature core of a fifth embodiment of the present invention; Fig. 10 is an explanatory plan view of an armature core of a sixth embodiment of the present invention; Fig. 11 is an explanatory plan view of an example of conventional armature cores; and Fig. 12 is a transverse section view taken along the line VI-VI in Fig. 11. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Description will hereinafter be given in detail of the embodiment of an armature core wire winding method according to the present invention with reference to the accompanying drawings. In Fig. 3, there is shown an example of a spindle motor to which the present invention is applied. At first, on the upper surface side of a substrate 11 in Fig. 3, an armature core 12 to be discussed later is fixed through a spacer 13 by a screw 14. The armature core 12, as shown in Figs. 1 and 2, can be produced by putting two core materials on each other and then applying an insulation coating thereto from above. The armature core 12 includes a cylindrical axial core portion 121 forming a central portion thereof and an integral multiple number of 3, in this case, 18 pieces of salient poles 123, 123, --- which are protruded radially from the outer peripheral surfaces of the cylindrical axial core portion 121. Three systems of wires 15, 16 and 17 are wound round the respective salient poles 123 in a method to be discussed later. Referring back to Fig. 3, the axial core portion 121 of the above-mentioned armature core 12 is fitted to the outer peripheral portion of a hollow cylindrical bearing holder 24. And, a rotary shaft 19 is supported by means of a pair of bearings 18 in the interiors of the bearing holder 24. A disc-shaped spindle hub 20 is fixed to the output side (which is the lower end side in Fig. 3) of the rotary shaft 19 and a plate-shaped rotor case 21 is fixed to the base side portion (which is the upper end side portion in Fig. 3) of the rotary shaft 19 by a screw 22. A ring-shaped magnet 23 is disposed in the outer peripheral side portion or flange portion 21a of the rotor case 21 in such a manner that it faces the outside portion of the wires 15 (16, 17) of the above-mentioned armature core 12. Now, as shown in Fig. 1, description will be given below of a first embodiment of the present method for winding the wires 15, 16 and 17 round the respective salient poles of the above-mentioned armature core 12. At first, referring to the above-mentioned salient poles 123, three mutually adjoining salient poles form a block. That is, a total of 6 blocks 123a, 123b, 123c, ---, 123f are sat in this manner. When winding the wires 15, 16 and 17 round the respective salient poles 123, three wire nozzles are used to wind wires firstly round the respective salient poles U1, V1 and W1 in the first block 123a simultaneously. After then, the wire windings are performed successively in the order of the second block 123b, third block 123c, ----. The winding of the wires 15, 16 and 17 in the respective blocks is performed in two stages while the three wire nozzles are being moved simultaneously. In other words, at first, the first-stage winding is carried out with 43 turns, for example, from the inside of the salient poles to the outside thereof and, after then, the second-stage winding is executed with 43 turns by return. This wire winding is performed without producing any clearances and lapwindings between the wires. Thus, the winding operations are not limited to this embodiment. Namely, it is not necessary to perform the winding operations simultaneously. The winding operation of the present invention allows that the transition wire is wound in two stages. After completion of the above-mentioned wire winding in the first block 123a, the wires are respectively draw out as transition wires 15a, 16a and 17a from the respective salient poles U1, V1 and W1 of the first block 123a toward the next or second block 123b. The drawing-out of the transition wires 15a, 16a and 17a is performed in such a manner that they are put in line on the upper side surface (the right surface in Fig. 2) of the core. Prior to description o the following wire winding step, description will be given at first of the system of the transition wire 15a out of the above-mentioned three systems of transition wires 15a, 16a and 17a. A shown in Fig. 4 as well, the transition wire 15a, which is drawn out from the salient pole U1 of the first block 123a with the wires completely wound thereround toward the upper side (the right side in Fig. 2) of the core, is extended in such a manner that it is passed over salient pole V1 adjoining the salient pole U1 and over the salient pole adjoining the pole V1 and is then guided to the corresponding salient pole U2 in the next or second block 123b. In this case, with respect to the salient pole V1, the transition wire 15a is extended on the lower surface side thereof which is opposite to the drawing-out side surface of the transition wire, 15a. Also, with respect to the salient pole W1 adjoining the pole V1, the transition wire 15a is extended on the upper surface side which is the drawing-out side surface of the transition wire 15a, and is guided from the upper surface side to the corresponding salient pole U2 in the second block 13b. Then, similarly to the above case, the wire can be wound round the salient pole U2. Also, the remaining two systems of transition wires 16a and 17a are wound similarly. In other words, the transition wires 16a and 17a, which are respectively drawn out to the upper side (or the right side in Fig. 2) of the core from the respective salient poles V1 and W1 with the wires completely wound thereround, are passed over the salient poles W1 and U2 respectively adjoining the relevant salient poles V1 and W1 and over the salient poles U2 and V2 respectively adjoining the poles W1 and U2 and are then guided to the corresponding salient poles V2 and W2 in the next block 123b, respectively. In this case, with respect to the salient poles W1 and U2, the transition wires 16a and 17a are extended on the lower surface sides which are opposite to the drawing-out side surface of the transition wires 16a and 17a, respectively. Also, with respect to the next salient poles U2 and V2 respectively adjoining the salient poles W1 and U2, the transition wires 16a and 17a are again extended on the upper surface sides which are the drawing-out side surfaces of the transition wires 16a and 17a, respectively, and are then guided from the upper surface sides to the corresponding salient poles V2 and W2 in the next or second block 123b, respectively. Then, the wires are wound round the salient poles V2 and W2 similarly as in the above-mentioned salient pole U2. By repeating these winding operations, the winding of the wires round the armature core 11 having three phases including a U phase, a V phase and a W phase can be completed. According to the first embodiment of the present invention, when the three systems of transition wires 15a, 16a and 17a are respectively extended from the respective salient poles U1, V1 and W1 in the first block 123a toward the respective salient poles U2, V2 and W2 in the adjoining second block 123b, only two of the above-mentioned three systems of transition wires are made to intersect with each other, for example, on the upper surface side of the core shown by a circle 30 in Fig. 1. The remaining system of transition wire is disposed on the lower side surface which is opposite to the above intersecting side. That is, in the present embodiment, the respective transition wires are lapped on each other in two stages similarly to the wires wound round the salient poles and, therefore, the height of the transition wires does not exceed that of the wires wound round the salient poles. Next, description will be given below of a second embodiment of the invention for winding wires 15, 16 and 17 round the respective salient poles 123 of the above armature core 12 by way of Fig. 6. In the second embodiment, the block structure of the salient poles 123 and the winding of the wires 15, 16 and 17 round the respective salient poles 123 are the same as in the first embodiment and thus the description thereof is omitted here. After completion of the wire winding in the above first block 123a, transition wires 15b, 16b and 17b are respectively drawn out from the respective salient poles U1, V1 and W1 toward the next or second block 123b. The drawing-out of the transition wires 15b, 16b and 17b is performed in such a manner that they are put in line on the upper surface (that is, the right surface in Fig. 2) of the core. Prior to description of the following wire winding step, description will be given at first of the system of the transition wire 15b among the above-mentioned three systems of transition wires 15b, 16b and 17b. As shown in Fig. 5 as well, the transition wire 15b drawn out toward the upper side (that is, the right side in Fig. 2) from the salient pole U1 of the first block 123a with the wire completely wound thereround is extended in such a manner that it is passed over the salient pole V1 adjoining the relevant salient pole U1 and over the salient pole W1 adjoining the salient pole V1 and is then guided to the corresponding salient pole U2 in the next or second block 123b. In this case, with respect to the salient pole V1, the transition wire 15b is extended on the upper surface side which is the drawing-out side surface of the transition wire 15b. Also, with respect to the salient pole W1 adjoining the pole V1, the transition wire 15b is extended on the lower surface side which is opposite to the drawing-out side of the transition wire 15b and is then guided from the upper surface side to the corresponding salient pole U2 in the second block 123b. Then, the wire is wound round the salient pole U2 similarly to the above case. Also, the other two systems of transition wires 16b and 17b are similarly wound. In particular, the transition wires 16b and 17b respectively drawn out toward the upper side (that is, the right side in Fig. 2) from the respective salient poles V1 and W1 with the wires completely wound thereround are passed over the salient poles W1 U2 respectively adjoining the relevant salient poles V1 and W1 and over the salient poles U2 and V2 respectively adjoining the poles W1 and U2, and are then guide to the corresponding salient poles V2 and W2 in the next or second block 123b respectively. In this case, with respect to the salient poles W1 and U2, the transition wires 16b and 17b are extended or led on the upper surface side of the drawing-out side surface of the transition wires 16b and 17b. Also, with respect to the next salient poles U2 and V2 respectively adjoining the salient poles W1 and U2, the transition wires 16b and 17b are extended again on the lower surface side which is opposite to the drawing-out side surface, and are then guided from the upper surface side toward the corresponding salient poles V2 and W2 in the next or second block 123b. Then, the wires are wound round the salient poles V2 and W2 similarly. By repeating these operations, the winding of the wires round the armature core 11 having three phases including U, V and W phases can be completed. Next, description will be given below of a third embodiment of the invention for winding wires 15, 16 and 17 round the respective salient poles 123 of the above armature core 12 used in the spindle motor in Fig. 3. At first, referring to the respective salient poles, as shown in Fig. 7, a block is composed of three salient poles U 1 , V 1 and W 1 which are obtained by means of trisecting of 360° and a total of 6 blocks 123a, 123b, 123c, ---, 123f are provided. Here, 360° is substantially trisected by use of a three nozzles in the following manner. That is, assuming that A, B and C in Fig. 7, it seems that a trisection of 360° is 120°. However, in fact, as can be clearly understood from Fig. 7, the trisection varies according to the number of salient poles provided in a motor and, for this reason, the trisections are not equal to one another, that is, they are not 120° equally. For example, in a motor which is used in the present invention, 18 salient poles are used an thus, at such angles as shown in Fig. 7, the salient poles are mounted at such positions (angles) that wires can be wound round a salient pole U1 corresponding to the U phase, a salient pole V1 corresponding to the V phase and a salient pole W1 corresponding to the W phase, and three nozzles are mounted at proper angular positions, respectively, for example, A, B and C shown in Fig. 7. And, the three nozzles are performed such that the wires can be wound round the salient pole U1 corresponding to the U phase, the salient pole V1 corresponding to the V phase and the salient pole W1 corresponding to the W phase, and the wires are then wound sequentially. Namely, the nozzle which is disposed on the portion A shown in Fig 7 performs the winding operation such that the wire is successively wound around the salient poles U1, U2, U3 ... U6 contained in U phase. The nozzle which is disposed on the portion B shown in Fig. 7 also performs the winding operation such that the wire is successively wound around the salient poles V1, V2, V3 ... V6, contained in V phase. The nozzle which is disposed on the portion C shown in Fig. 7 also performs the winding operation such that the wire is successively wound around the salient poles W1, W2, W3 ... W6 contained in W phase. The winding operations in U, V, and W phases are simultaneously performed. Also, as shown in Fig 7, in the respective U, V and W phases, the start position (for example, salient pole U1) of the wire winding and the end position (for example, salient pole U6) thereof are set so as to adjoin each other. The positions on which the nozzles are respectively disposed are decided by the calculation in accordance with the number of salient pole. And, when winding actually the wires 15, 16 and 17 round the respective salient poles 123, at first the wires are wound round the respective salient poles U1, V1 and W1 in the first block 123a, and the wire winding is then successively performed in the order of the following second block 123b, third block 123c, ---. The winding of the wires 15, 16 and 17 in the respective blocks is carried out in two stages while three wire nozzles are being moved simultaneously. That is, at first in the first stage the winding is executed 43 turns, for example, from the inside of the salient pole toward the outside thereof and, after then, in the second stage, the winding is carried out 43 turn by return. In this case, the wire winding can be preformed without producing any clearances and lapwings between the wires. Thus, the winding operation is not limited to this embodiment. Namely, it is not necessary to perform the winding operation in simultaneous. The winding operation of the present invention allows that the transition wire windings is wound in two stages. After completion of the wire winding in the above first block 123a, transition wires 15a, 16a and 17a are drawn out respectively from the respective salient poles U1, V1 and W1 of the first block 123a toward the next or second block 123b. The drawing-out of the transition wires 15a, 16a 17a is performed in such a manner that they are put in line on the upper surface (that is, the right surface in Fig. 2) of the core. Now, prior to description of the following wire winding step, at first description will be given below of the system of the transition wire 15a out of the above-mentioned three systems of transition wires 15a, 16a and 17a. As shown in Fig. 4 as well, the transition wire drawn out toward the upper side (that is, the right side in Fig. 2) of the core from the salient pole U1 of the first block 123a with the wires completely wound thereround is led or extended in such a manner that it is passed over a salient pole V5 adjoining the relevant salient pole U1 and over a salient pole W4 adjoining the salient pole V5 and is then guided to the corresponding salient pole U2 of the next or second block 123b. In this case, with respect to the salient pole V5, the transition wire 15a is extended on the lower surface side which is opposite to the drawing-out side surface of the transition wire 15a. Also, with respect to a salient pole W4 adjoining the salient pole V5, the transition wire 15a is extended on the upper surface side which is the drawing-out surface of the transition wire 15a and is then guided from the upper surface side to the corresponding salient pole U2 of the second block 123b. Then, the wire is wound round the salient pole U2 similarly to the above-mentioned case. Also, the other two systems of transition wires 16a and 17a are also treated similarly to the transition wire 15a. In other words, the transition wires 16a and 17a respectively drawn out toward the upper side (that is, the right side in Fig, 2) of the core from the respective salient poles V1 and W1 with the wires completely wound thereround are passed over salient poles W6 and U5 respectively adjoining the relevant salient poles V1 and W2 as well as over salient poles U4 and V3 respectively adjoining the salient poles W6 and U5, and are then guided to the corresponding salient poles V2 and W2 of the second block 123b. In this case, with respect to the salient poles W6 and U5, the transition wires 16a and 17a are extended on the lower surface side which is opposite to the drawing-out side surface of the transition wires 16a and 17a. Also, with respect to the salient poles U4 and V3 respectively adjoining the salient poles W6 and U5, the transition wires 16a and 17a are respectively extended again on the upper surface side which is the drawing-out side of the transition wires 16a and 17a, and are then guided to the corresponding salient poles V2 and W2 of the second block 123b, respectively. Then, the wires are similarly wound round the salient poles V2 and W2. By performing these operations repeatedly, the winding of the wires round the armature core 11 having three phases including U, V and W phases can be completed. Now, description will be given below of a fourth embodiment of the invention for winding a wire 15 (16, 17) round the respective salient poles 123 of an armature core 12 used in a spindle motor shown in Fig. 3. In this fourth embodiment, the wires are not wound simultaneously by use of the three nozzles as in the above-mentioned embodiment, but a single nozzle is used to wind a wire round all salient poles provided in the armature core 12, one by one, in such a manner that the salient poles belonging to the same specified phase of U, and W phases forming the three systems of armature core can correspond to the same specified phase. Referring firstly to the above-mentioned salient poles 123, a block is composed of three salient poles, U 1 , V 1 and W 1 which correspond to the same specified phase of the U, V and W phases forming the three systems and in the salient poles 123, as shown in Fig. 8, there are set a total of 6 blocks 123a, 123b, 123c, ---, 123f. When winding the wire 15 round the respective salient poles 123, a single wire nozzle is used to wind the wire 15 firstly round salient poles U1 to U6 corresponding to the U phase. That is, as shown in Fig. 8, the wire winding is firstly performed round the salient pole U1 of the first block, and the wire winding is then performed successively round the salient poles in the order of the salient pole U2 of the second block, ---, the salient pole U6 of the sixth block. When the wire winding is completed with respect to all salient poles U1 to U6 corresponding to the U phase in this manner, a tapping operation is performed. The tapping operation means that, between the end of the winding round the salient pole U6 corresponding to the U phase and the start of the winding round the salient pole V1 corresponding to the next V phase, a wire material for the wire 15 is held by another member to thereby slacken the wire material so as to secure a wire having a length required for soldering or common treatment. By the way, a joined wire material may be cut to a necessary length in the step of the material being held by another member, or it may be cut to a necessary length when the winding of the wire round all salient poles of the U, V and W phases forming the three systems is completed. Now, the tapped wire 15 is then wound round a salient pole V1 corresponding to the next or V phase in the first block. Similarly to the U phase, the winding of the wire 15 is successively performed round the salient poles in the order of a salient pole V2 in the second block, ---, and a salient pole V6 in the six block. When the wire winding with respect to all salient poles V1 to V6 corresponding to the V phase, as described above, the wire 15 is tapped again between the salient pole V6 and a salient pole W1 corresponding to the next W phase. Further, the wire 15 is wound successively round the salient poles corresponding to the W phase in the order of a salient pole W1 in the first block, ---, a salient pole W6 in the sixth block. Here, the winding of the wire round the respective salient poles, similarly to the above-mentioned embodiments, is performed in such a manner that the first stage winding is carried out 43 turns, for example, from the inside of the salient pole toward the outside thereof and after then the second stage winding is carried out 43 turns from the outside toward the inside. In this case, the wire winding is performed without producing any clearances and overlapping between the wires. As described above, in the winding of the wire round the salient poles corresponding to the same specified phase, after completion of the winding of the wire round one of the salient poles, a transition wire 15a is drawn out from the salient pole with the wire completely wound thereround toward the next salient pole corresponding to the same specified phase. After the winding round the salient pole U1 in the first block 123a is completed, the transition wire 15a is drawn out from the salient pole U1 toward a salient pole in the next or second block. The drawing-out of the transition wire 15a is performed on the upper surface (that is, the right surface in Fig. 2) of the core. In the next wire winding step, as shown in Fig. 4 as well, the transition wire 15a drawn out toward the upper side (that is, the right side Fig. 2) of the core from the salient pole U1 of the first block 123a with the wire completely wound thereround, as shown in Fig. 8, is extended in such a manner that it is passed over a salient pole V6 adjoining the relevant salient pole U1 and over a salient pole W1 adjoining the pole V6 and is the guided to a salient pole U2 corresponding to the U phase in the next or second block 123b. In this case, with respect to the salient pole V6, the transition wire 15a is extended on the lower surface side which is opposite to the drawing-out side surface of the relevant transition wire 15a. Also, with respect to the next salient pole W1 adjoining the salient pole V6, the transition wire 15a is extended again on the upper surface side which is the drawing-out side surface of the transition wire 15a, and is then guided from the upper surface side to a salient pole U2 corresponding to the U phase in the second block 123b. Then, the wire 15a is wound round the salient pole U2 similarly to the above-mentioned case. Also, the other two transition wires 16a and 17a of the other two systems respectively forming the V and W phases are treated similarly to the above-mentioned transition wire 15a. In the fourth embodiment, a single nozzle is used to wind only the wire 15 round all salient poles of the armature core 12. Therefore, actually, the two transition wires 16a and 17a are the same as the transition wire 15a. That is, the terms "transition wires 16a and 17a" are used only for the purpose of explanation. Further, in the fourth embodiment, the winding start positions for the U, V and W phases can be set arbitrarily. Next, description will be given below of a fifth embodiment of the invention for winding wires 15, 16 and 17 round the respective salient poles 123 of the above armature coil 12 with reference to Fig. 9. The block structure of the salient poles and the winding of the wires 15, 16 and 17 round the respective salient poles 123 are the same as in the third embodiment and thus the description thereof is omitted here. After completion of the wire winding in the first block 123a, transition wires 15b, 16b and 17b are drawn out respectively from the respective salient poles U1, V1 and W1 of the first block 123a toward the second block 123b. The drawing-out of the transition wires 15b, 16b and 17b is conducted in such a manner that they are put in line on the upper side surface (that is, the right surface in Fig. 2) of the core. Prior to description of the next wire winding step, description will be given at first of the system of the transition wire 15b out of the three systems of transition wires 15b, 16b and 17b. As shown in Fig. 5 as well, the transition wire 15b drawn out toward the upper side (that is, the right side in Fig. 2) from the salient pole U1 of the first block 123a with the wire completely wound thereround is extended in such a manner that it is passed over a salient pole V5 adjoining the relevant salient pole U1 and over a salient pole W4 adjoining the salient pole V1 and is then guided to a corresponding salient pole U2 in the second block 123b. In this case, with respect to the salient pole V5, the transition wire 15b is extended on the upper surface side which is the drawing-out side surface of the relevant transition wire 15b. Also, with respect to the next salient pole W5 adjoining the salient pole V5, the transition wire 15b is extended on the lower surface side which is opposite to the drawing-out side surface of the transition wire 15b and is then guided from upper surface side to a corresponding salient pale U2 in the second block 123b from the upper surface side. Then, the wire is wound round the salient pole U2 similarly to the above-mentioned case. Also, the remaining two systems of transition wires 16b and 17b are wound similarly to the above-mentioned transition wire 15b. In particular, the transition wires 16b and 17b drawn out toward the upper side (that is, the right side in Fig. 2) respectively from the respective salient poles V1 and W1 with the wire completely wound thereround are passed over salient poles W6 and U5 respectively adjoining the relevant salient poles V1 and W1 and over salient poles U4 and V3 respectively adjoining the salient poles W6 and U5, and are then respectively guided to corresponding salient poles V2 and W2 in the next block 123b. In this case, with respect to the salient poles W6 and U5, the transition wires 16b and 17b are respectively extended on the upper surface side which is the drawing-out side of the transition wires 16b and 17b. Also, with respect to the salient poles U4 and V3 respectively adjoining the salient poles W6 and U5, the transition wires 16b and 17b are respectively extended on the lower side surface which is opposite to the drawing-out side surface of the transition wires 16b and 17b, and are then respectively guided to corresponding salient poles V2 and W2 in the second block 123b. Similarly, the wires are then wound round the salient poles V2 and W2. By performing these winding operations repeatedly, the wire winding of the armature core 11 having three phases including U, V and W phases can be completed. Further, description will be given below of a sixth embodiment of a method for winding a wire 15 round the respective salient poles 123 of the above-mentioned armature core 12 according to the present invention. In the sixth embodiment, similarly as in the fourth embodiment discussed above, the wires are not wound simultaneously by use of three nozzles but a single nozzle is used to wind the wire round all salient poles provided in the armature core 12 one by one in such a manner that the salient poles belonging to the same specified phase of U, V and W phases respectively forming three systems can correspond to the same specified phase. Therefore, the block structure of the above-mentioned salient poles 123 and the winding of the wire 15 round the respective salient poles 123 are the same as those of the fourth embodiment and thus the description thereof is omitted here. Now, in the winding of the wire round the salient poles corresponding to the same specified phase, after completion of winding of the wire round one salient pole, a transition wire 15b is drawn out from the salient pole with the wire completely wound thereround toward the next salient pole corresponding to the same specified phase. After completion of winding of the wire round a salient pole U1 in the above-mentioned first block 123a, the transition wire U1 is drawn out from the salient pole U1 toward a salient pole U2 in the next or second block. The drawing-out of the transition wire 15b is executed on the upper side surface (that is, the right side surface in Fig. 2) of the core. In a wire winding step following the above operation, as shown in Fig. 5 as well, the transition wire 15b drawn out toward the upper side (that is, the right side in Fig. 2) from the salient pole U1 of the first block 123a with the wire completely wound thereround, as shown in Fig. 10, is extended in such a manner that it is passed over a salient pole V1 adjoining the relevant salient pole U1 and over a salient pole W1 adjoining the salient pole V1 and is then guided to a salient pole U2 corresponding to the U phase in the next or second block 123b. In this case, with respect to the salient pole V1, the transition wire 15b is led or extended on the upper surface side which is the drawing-out side surface of the relevant transition wire 15b. Also, with respect to the salient pole W1 adjoining the salient pole V1, the transition wire 15b is extended on the lower surface side which is opposite to the drawing-out side surface of the transition wire 15b and is then guided from the upper surface side to a salient pole U2 which corresponds to the U phase in the second block 123b. The transition wires 16b and 17b of the remaining two systems respectively forming the V and W phases are also wound similarly. Specifically, in the sixth embodiment, similarly as in the before-mentioned fourth embodiment, a single nozzle is used to wind only the wire 15 round all salient poles of the armature core 12. Therefore, in fact, the transition wires 16b and 17b are the same as the transition wire 15b. That is, only for the purpose of explanation, the transition wires 16b and 17b are used. In the sixth embodiment as well, the winding start positions of the U, V and W phases can be set arbitrarily. In the above-mentioned description of the first to sixth embodiments, the direction of U phase ⇒ V phase ⇒ W phase ⇒ U phase --- is assumed to be clockwise (CW) with the winding direction in the salient poles being clockwise. However, this is not limitative but the direction may be counter-clockwise (CCW) with the winding direction in the salient pole being counter-clockwise. In this case, the spindle motor may be rotated in the reversed direction. Moreover, the present invention allows that the direction of U phase ⇒ V phase ⇒ W phase ⇒ U phase --- is assumed to be clockwise (CW) with the winding direction in the salient pole being counter-clockwise. However, this is not limitative but the direction may be clockwise with the winding direction in the salient poles being clockwise. In this case, the difference between two winding operations in same directions with the different winding direction in salient pole is only that when the transition wire travels through the salient poles, the drawing out side surface of the transition wire is opposite from each other. As has been described heretofore, according to the invention, due to the fact that, out of three systems of transition wires respectively going from the salient poles of a block to the salient poles of another block, only the two systems of transition wires are made to intersect with each other while the remaining one system of transition wire is extended on the opposite side of the core to the intersecting side thereof, the wire winding round the salient poles of the armature core can be performed properly without intersecting the transition wires of the core winding wires with one another at many points, so that a rotary electric machine of a reduced thickness can be supplied.

Claims: Armature core wire winding method in which an armature core (12) has salient poles (123) set to be an integral multiple number of three (123a - f), said salient poles (123) protruding radially from an axial core portion (121) of said armature core (12), said method comprising the steps of: winding first, second and third wires (15, 16, 17) in two stage windings around respective first, second and third salient poles (U 1 , V 1 , W 1 ), said three salient poles being included into a first block (123a) ; drawing out said wires as first, second and third transition wires (15a, 16a, 17a) from said respective first, second and third salient poles of said first block, in such a manner that the three transition wires are drawn out at the same drawing out surface side of said salient poles; extending said transition wires (15a, 16a, 17a) in such a manner that each transition wire passes over two adjoining salient poles, wherein two transition wires extended respectively from two salient poles of said first block toward said second block are made to intersect with each other (30) with the remaining transition wire being positioned on a surface side opposite to the intersecting side surface; winding said first, second and third transition wires (15a, 16a, 17a) round respective first, second and third salient poles (U 2 , V 2 , W 2 ) of a second block (123b), each salient pole of said second block corresponding to each salient pole of said first block; and repeating said winding, drawing out, extending and winding steps until said transition wires (15a, 16a, 17a) have been completely wound around said salient poles (123). Armature core wire winding method as claimed in claim 1, wherein said three transition wires (15a, 16a, 17a) are wound around said salient poles (123), simultaneously. Armature core wire winding method as claimed in claim 1, wherein said first, second and third salient poles are mutually adjoined. Armature core wire winding method as claimed in claim 1, wherein when said three transition wires (15a, 16a, 17a) are drawn out from said three salient poles (U 1 , V 1 , W 1 ), respectively, each of said transition wires being extended on an opposite surface to said drawing out surface side at a salient pole directly adjoining said salient pole from which the transition wire is drawn out , said transition wire being further extended on said drawing out surface at a salient pole adjoining said directly adjoining salient pole, and said transition wire being wound around a salient pole of said second block from said drawing out surface. Armature core wire winding method as claimed in claim 1, wherein when said three transition wires (15a, 16a, 17a) are drawn out from said respective three salient poles (U 1 , V 1 , W 1 ), each of said transition wires being extended on said drawing out surface side at a salient pole directly adjoining said salient pole from which said transition wire is drawn out , said transition wire being further extended on an opposite surface to said drawing out surface at a salient pole adjoining said directly adjoining salient pole , and said transition wire being wound around a salient pole of said second block from said drawing out surface. Armature core wire winding method as claimed in claims 1, 2, 4 or 5, wherein said salient poles are disposed substantially at respective trisections of 360° to form three blocks. Armature core wire winding method in which an armature core (12) has salient poles (123) set to be an integral multiple number of three (123a - f), said salient poles (123) protruding radially from an axial core portion (121) of said armature core (12), each said salient pole corresponding to one of three systems (U, V, W), said method comprising the steps of: winding a wire (15) in two stage windings around a salient pole of a first block, said salient pole being completely wound and included into a first system (U); drawing out said wire as a transition wire (15) from said salient pole of a first system, in such a manner that said transition wire is drawn out at a drawing out surface side of said salient poles; extending said transition wire in such a manner that said transition wire passes over two adjoining salient poles, wherein said transition wire is extended on a first surface side at a salient pole directly adjoining said salient pole having said wire completely wound , said transition wire being further extended on a surface side opposite to said first surface side at the salient pole adjoining said directly adjoining salient pole and said transition wire being wound around a salient pole of a second block at said drawing out surface , said salient poles of said first and second blocks being in said first system; repeating said winding, drawing out, extending and winding steps until said wire is completely wound around said salient poles of said first system; and repeating said winding, drawing out, extending, winding and repeating steps until said transition wire is completely wound around said salient poles of each system (U, V, W). Armature core wire winding method as claimed in claim 7, wherein said first surface side is an opposite side to the drawing out surface side of said transition wire. Armature core wire winding method as claimed in claim 7, wherein said first surface side is the drawing out surface side of said transition wire. Armature core wire winding method as claimed in claim 7, wherein when said transition wire is wound around the salient poles of the other systems (V, W), said transition wire being cut after said transition wire is completely wound around said salient poles of said first system (U). Armature core wire winding method as claimed in claim 7, wherein after said transition wire is wound around said salient poles of said first system, said transition wire being wound around salient poles corresponding to another system with said transition wire being held by a holding member to connect said three systems with another, when said transition wire is completely wound around said salient pole corresponding to said one of said three systems, said transition wire being cut at said holding member.

Inventors: ARASAKI EIJI, SAKASHITA HIROSHI, ARASAKI, EIJI, SAKASHITA, HIROSHI
Applicants: SANKYO SEIKI SEISAKUSHO KK, KABUSHIKI KAISHA SANKYO SEIKI SEISAKUSHO
Application year: 1992
Main classification: H02K15
IPC codes: H02K3, H02K15