Method for manufacturing stator rotating machine

Abstract: A method for manufacturing a stator for use in a rotating machine provided with a core main body having a plurality of teeth projecting on an outer circumferential side of the core main body and wound with a coil and a ring member fitted in the outer circumferential portion thereof. The method includes the steps of: inserting a jig (3) into an interior of the core main body (8); clamping a wind start portion (19a,29a) of the coil (19,29) on one portion of the jig, winding the coil between the teeth (14), and clamping a wind terminating portion (19b,29b) of the coil on the other portion of the jig; fitting the ring member (35) in the outer circumferential portion of the core main body; insert­ ing a terminal unit (37) into the core main body; winding the coil, clamped on the jig, around each pin (39) of the terminal unit and soldering the coil onto the pin; and shaping configuration of the coil wound between the teeth.

Description: The present invention relates to a method for manufacturing a stator for use in a rotating machine such as an inner rotor type electric motor having a cylindrical stator. A conventional stator for use in an inner rotor type electric motor is manufactured by a so-called inserting method. According to this method, a coil wound around a frame is inserted into a slot between adjacent teeth of a plurality of teeth projecting in the inner circumferential side of a cylindrical stator core. The present applicant has proposed a stator core, comprising a core main body having a plurality of teeth projecting on the outer circumferential side thereof and a ring member fitted in the outer circumferential portion of the teeth, disclosed in Japanese Laid-Open Patent Publication No. 58-33945. According to this stator core, a coil is directly wound by a flyer on teeth positioned on the outer circumferential side of the core main. According to the conventional inserting method, a coil is shaped after it is wound, the coil is inserted into a slot through a slit positioned between edge portions of adjacent teeth, portions of the coil projecting from both edges of the stator core are shaped to fix them to a predetermined member, and then the wind start and terminating portions of the coil, i.e. the outgoing lines, are fixed to fixing members. As such, the method requires a lot of processes and its manufacturing process is complicated, so that its productivity is low and it is very difficult to automate the manufacturing process. According to the method disclosed in Japanese Laid-Open Patent Publication No. 58-33945, since the coil is directly wound around the core main body, it is unnecessary to insert the coil and perform subsequent operations after the insert of the coil. The manufacturing process can be simplified to a great extent, however, the method still requires time and labor to fix the outgoing lines of the coil to fixing members. But it is difficult to automate the manufacturing process. It is difficult to know the number of turns (hereinafter referred to as space factor) of the coil which can be wound in a slot formed between teeth and in addition, the space between the outer circumferential portion of the coil and the projection positioned in the edge of the tooth is small, so that it is difficult to insert a wedge therebetween. Accordingly, an essential object of the present invention is to provide a method, for manufacturing a stator for use in a rotating machine, capable of effectively mounting a coil on a stator core and automating the manufacturing process required therefor. US-A-3792299 discloses a method for manufacturing a stator for use in a rotating machine, the stator being provided with a core main body having a plurality of teeth projecting on an outer circumferential side of the core main body and wound with a coil and a ring member fitted on the outer circumferential portion of the teeth, comprising the steps of inserting a jig into an interior of the core main body, winding the coil between the teeth, and fitting the ring member on the outer circumferential portion of the core body; and according to the present invention, such a method is characterised by, prior to the winding of the coil, clamping a wind start portion of the coil on one portion of the jig, and after the winding of the coil, clamping a wind terminating portion of the coil on the other portion of the jig; and following the fitting of the ring member, mounting a terminal unit on the core main body or the ring member, wrapping the wind start portion and wind terminating portion around each pin of the terminal unit and soldering the coil onto the pin; and shaping the configuration of the coil would between the teeth. A jig is inserted into the interior of the core main body and the wind start and terminating portions of the coil are clamped by the jig. Therefore, the wind start and terminating portions of the coil can be easily transferred from the jig to the pin of the terminal unit, for supplying electric current, installed in a subsequent process. As such, the method, for manufacturing the rotating machine, ranging from the process for manufacturing the stator to the process for incorporating the rotor into the stator can be easily automated. Preferably the method further comprises the step of regulating the interior of the core main body by a mechanism of the jig between the steps of inserting and clamping. The core main body which is comparatively deformable is reinforced and maintained although the core main body is thin. Preferably in the winding step, when the coil is wound between the teeth by a flyer, the coil is pressed toward a centre of the core main body in synchronisation with rotation of the flyer. Therefore, the slot can accommodate many turns of the coil and as such the space factor can be improved. Preferably the method further comprises the step of inserting a wedge of insulating material between an outer circumferential portion of the coil and a circumferential projection projecting from a radially outer edge of a tooth, so as to fill a slot between adjacent teeth and press the coil towards the centre of the core main body so as to shape the coil. Therefore, the wedge can be easily inserted into the space between the projection positioned on the tooth edge and the outer circumferential portion of the coil. Preferably the wind start portion and the wind terminating portion of the coil are removed from the jig and are cut to form a predetermined length respectively before wrapping in the step of wrapping the portions around each pin. Therefore, a coil connecting operation can be easily automated. In the accompanying drawings:- Fig. 1 is a flow diagram showing the entire arrangement of a manufacturing line; Figs. 2 and 3 are perspective views showing a jig; Fig. 4 is a perspective view showing a core main body; Fig. 5 is a perspective view showing an inner circumferential side winding portion; Fig. 6 is a perspective view showing a wedge inserting portion; Fig. 7 is a perspective view showing an outer circumferential side winding portion; Figs. 8 through 10 are perspective views showing a connecting process; and Figs. 11 and 12 are perspective views showing a process for assembling a rotor and other parts. Fig. 1 is a flow diagram showing the process of an automated line of a rotating machine according to the embodiment. In Fig. 1, reference numeral 1 denotes an automated line, of a rotating machine, comprising a pair of conveyors 2a and 2b arranged in the front and the rear which move thereon a plate for holding a plurality of jigs 3 (refer to Fig. 2) and position the plate 4 at an arbitrary position thereof. Machines described below are sequentially arranged along the conveyor lines 2a and 2b. Reference numeral 12 represents a robot for sequentially placing a supplied core main body 8 on each jig 3 arranged along the conveyor line 2a. A mechanism 13 for opening and closing a collet 9 of the jig 3 is provided along the conveyor line 2a. In Figs. 2 and 3, a plurality of coil clamps 5 and 6 (two each in this embodiment) are mounted above the jig 3. The clamp 5 is provided with an eccentric cam 7 for locking a coil. The collet 9 for regulating and maintaining the interior of the core main body 8 is positioned in the middle portion thereof. The collet 9 is opened and closed by moving a taper pin 10 upward and downward. A stopper 11 is provided to adjust the diameter of the collet 9. As shown in Fig. 4, a plurality of teeth 14 project from the outer circumferential portion of the core main body 8 and a slot 15 is each positioned between adjacent teeth 14. Projections 16 are formed on both sides of each tooth 14 in the circumferential direction thereof. A slit 17 for allowing the coil to pass therethrough in the coil winding is formed between projections 16 and 16 opposed to each other. Fig. 5 is a perspective view showing the winding portion of a pair of first winding machines 18. In Fig. 5, an inner circumferential side coil 19 is wound between the teeth 14 of the core main body 8 using a flyer 20. At this time, a wind starting portion 19a of the coil 19 is held by the first clamp 5 and locked by the first eccentric cam 7. Thereafter, each three teeth 14 are wound using each corresponding slot 15 with a predetermined number of turns of the coil 19 with two slots 15 skipped therebetween. When the coil 19 is wound round the core main body 8 in this manner, the wind terminating portion 19b of the coil 19 is held by the second clamp 6 as shown in Fig. 6. The coil 19 is supplied from a nozzle 21 positioned at the top portion of the flyer 20. The nozzle 21 is positioned above the core main body 8 corresponding to the center thereof, thus tightening the coil 19 toward the bottom of the slot 15. Cooperatively with the flyer 20, a pusher 22 presses the coil 19 toward the bottom of the slot 15 at each turn of the coil 19. Fig. 6 is a perspective view showing the wedge inserting portion of the winding machine 18. In Fig. 6, a shaping plate 23 shapes the coil 19 wound on the core main body 8 and provides a gap in the radial direction thereof between the outer circumferential surface of the coil 19 and the inner circumferential surface of the projection 16 positioned on the tooth edge so as to facilitate the insertion of a wedge 24 therebetween. The wedge 24 is mounted on a magazine 25 after it is shaped by cutting it to a predetermined length. The wedge 24 is inserted one by one therebetween by being pressed upward by a bar 26. A coil shaping machine 27 shapes the configuration of the coil 19 wound on the core main body 8 by the winding machine 18. Reference numeral 28 denotes a pair of second winding machines which wind an outer circumferential side coil 29 between the teeth 14 of the core main body 8 as shown in Fig. 7. The wind start portion of the coil 29 is held by the first clamp 5 and locked by the second eccentric cam 7. Thereafter, similarly to the inner circumferential side coil 19, each three teeth 14 are wound using each corresponding slot 15 with a predetermined number of turns of the coil 29 with two slots 15 skipped therebetween (the inner circumferential side coil 19 has been wound in these two slots). The inner circumferential side coil 19 and the outer circumferential side coil 29 are wound in zigzag in the circumferential direction of the core main body 8, and finally, the terminating portion of the coil 29 is held by the second clamp 6. A flyer 30, a nozzle 31, and a pusher 32 shown in Fig. 7 are arranged and function similarly to the flyer 20 and the nozzle 21 of the first winding machine 18 and the pusher 22 each shown in Fig. 5. The winding machine 28 also includes a wedge inserting portion as shown in Fig. 6 and performs the same operation as shown in Fig. 6. In a wedge shaping machine 33, the wedge 24, the coils 19 and 29 are inserted through the slit 17 and pressed inward. Thus, the coils 19 and 29 are shaped. A ring member pressing machine 34 presses a ring member 35 against the outer circumferential portion of the core main body 8 so as to fit the ring member 35 therein. A connector inserting machine 36 mounts an electric current supply connector 37 on the ring member 35 and straightens the cylindrical configuration of the coils 19 and 29 in the vertical direction thereof. A connecting machine 38 removes the wind start portion 19a of the coil 19 and the wind start portion 29a of the coil 29 from the clamp 5 of the jig 3 and the terminating portion 19b of the coil 19 and the terminating portion 29b of the coil 29 from the clamp 6 thereof, thus winding them around each of terminal pins 39 of the connector 37. Figs. 8, 9, and 10 show the connecting portion of the connecting machine 38. In Figs. 8, 9, and 10, a chuck 40 moves in the radial direction of the core main body 8 and removes the terminating portion 29b of the coil 29 from the second clamp 6, thus catching it. The chuck 40 moves vertically to tighten the terminating portion 29b of the coil 29 without slack and transfer it to a binding jig 42. A cutter 43 provided below the chuck 40 cuts the coil 29 to a predetermined length. The chuck 40 moves to discharge unnecessary portion of the coil 29. The binding jig 42 pivots so that it becomes parallel with the terminal pin 39 of the connector 37, and moves above the first terminal pin 39. The binding jig 42 which is hollow moves to accommodate the first terminal pin 39 therein and pivots about the first terminal pin 39 so as to wind the terminating portion 29b around the first terminal pin 39. The binding jig 42 repeats similar operations to wind the wind start portion 29a of the coil 29, the wind start portion 19a of the inner circumferential side coil 19, and the terminating portion 19b thereof around the first, second, and third terminal pins 39, respectively. When the chuck 40 moves to catch the wind start portions 19a of the coil 19 and the wind start portions 29a of the coil 29, a cylinder 41 presses the first eccentric cam 7 so that the first clamp 5 is unlocked. A transfer apparatus 44 transfers the core main body 8 from the jig 3 to a pallet 45 placed on the conveyor line 2b. The transfer apparatus 44 includes a mechanism for opening and closing the collet 9 of the jig 3. A soldering machine 46 solders the wind start portion 19a of the coil 19, the wind terminating portion 19b thereof, the wind start portion 29a of the coil 29, and the wind terminating portion 29b thereof onto each terminal pin 39 around which the above three portions have been wound. Reference numeral 47 denotes an assembling machine. The assembling machine 47 mounts a bracket 48 on one of the opening portions of the core main body 8 as shown in Fig. 11. In mounting the bracket 48 on the opening, the core main body 8 is lifted from the pallet 45 so as to insert the bracket 48 into the core main body 8. Then, the bracket 48 is temporarily fixed to the core main body 8, then inverted and returned to the pallet 45. As shown in Fig. 12, a washer 49, an assembled rotor 50, an insulating ring 51 are inserted into the other opening of the core main body 8 and a bracket 52 is mounted thereon. Then, pressure resistance, and resistance value are inspected by an examining device 53. Then, the brackets 48 and 52 are fixed to the core main body 8 by a molding machine 54 and a film is applied to the outer circumferential surfaces of the coils 19 and 29. Thus, a flanger to be mounted on a product is manufactured. According to the method for manufacturing a stator for use in a rotating machine of the embodiment of the present invention, a clamp mechanism is provided on one end portion of a jig attached to a core so that the clamp mechanism holds the wind starting and terminating portions of a coil. When the wind starting and terminating portions of each coil are wound around a pin of a connector in a subsequent process, a chuck is capable of easily catching each wind starting and terminating portion thereof. Thus, the method of the embodiment of the present invention allows the start and terminating portions of each coil to be automatically clamped by the chuck. Therefore, the clamping of the start and terminating portions of each coil can be accomplished at a fast speed and without much time and labor. In addition, the method of the embodiment of the present invention automates the process for manufacturing a rotating machine including the process for incorporating a rotor into the stator of the rotating machine. Further, the coil can be reliably held by inserting a wedge into an inserting portion after the coil is wound on the core, and further, the wedge can be fixed by a molding. Thus, the manufacturing process including an outer mounting can be automated on a conveyor line.

Claims: A method for manufacturing a stator for use in a rotating machine, the stator being provided with a core main body having a plurality of teeth (14) projecting on an outer circumferential side of the core main body and wound with a coil (19,29) and a ring member (35) fitted on the outer circumferential portion of the teeth (14), comprising the steps of inserting a jig (3) into an interior of the core main body (8), winding the coil between the teeth (14), and fitting the ring member (35) on the outer circumferential portion of the core body; characterised by, prior to the winding of the coil, clamping a wind start portion (19a,29a) of the coil (19,29) on one portion of the jig, and after the winding of the coil, clamping a wind terminating portion (19b,29b) of the coil on the other portion of the jig; and following the fitting of the ring member, mounting a terminal unit (37) on the core main body or the ring member, wrapping the wind start portion (19a,29a) and wind terminating portion (19b,29b) around each pin (39) of the terminal unit and soldering the coil onto the pin, and shaping the configuration of the coil wound between the teeth. A method according to claim 1, further comprising the step of regulating the interior of the core main body by a mechanism (9) of the jig (3) between the steps of inserting and clamping. A method according to claim 1 or claim 2, wherein, in the winding step, when the coil is wound between the teeth by a flyer (20,30), the coil is pressed towards a centre of the core main body in synchronisation with rotation of the flyer. A method according to any one of the preceding claims, further comprising the step of inserting a wedge of insulating material (24) between an outer circumferential portion of the coil and a circumferential projection (16) projecting from a radially outer edge of a tooth (14), so as to fill a slot (15) between adjacent teeth and press the coil towards the centre of the core main body so as to shape the coil. A method according to any one of the preceding claims, wherein the wind start portion (19a,29a) and the wind terminating portion (19b,29b) of the coil are removed from the jig (3) and are cut to form a predetermined length respectively before wrapping in the step of wrapping the portions around each pin (39).

Inventors: DOI YOSHINORI, INAKI SHIGEO, KAWAZOE HIROSHI, MURAKOSHI TOSHIICHI, TAKAHATA TOSHIHIRO, YAMASHITA TATSUO, DOI, YOSHINORI, INAKI, SHIGEO, KAWAZOE, HIROSHI, MURAKOSHI, TOSHIICHI, TAKAHATA, TOSHIHIRO, YAMASHITA, TATSUO
Applicants: MATSUSHITA ELECTRIC IND CO LTD, MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.
Application year: 1990
Main classification: H02K15
IPC codes: H02K15