Patent GB-1006158-A (GB)
Title: Devices for winding slotted stator sheet stacks in electric machines having stationary poles
IPC: H02K15/085
Filed: 1961-12-22
Abstract: 1,006,158. Coil-making apparatus. H. DROLL. Dec. 22, 1961 [July 21, 1961], No. 46119/61. Heading B3A. [Also in Division F2] A method of winding a stator for an electric motor comprises attaching fingers 34 (Figs. 1, 13) so as to project from either side of the stator 16, guiding wires through the slotted bore by means of at least two reciprocating needles 108, rotating the stator 16 through a predetermined angle to form the end of each turn at the end of each reciprocating movement and deflecting the wires outwardly by means of curved deflectors 74 over the ends of the fingers 34 during each rotational movement. Stator clamping arrangements.-The stator stack 16 (Fig. 1) is supported in a ring 24 and surrounded by groups 30 of fingers 34 so as to form " crowns " of fingers 34 projecting from each side. The stator 16 is next placed in a jig 12 having a top 14 and coupled to an actuating plate 42 which is driven by a ring gear 48 (Fig. 2). The top 14 of the jig 12 is clamped by a pneumatically-controlled device 76 having an arm 82 with rollers 86 pressing against the top plate 14. Needle reciprocation.-A pair of needles 108 (Fig. 13) is mounted at the upper end of a reciprocating arm 72 (Fig. 9). A cam mechanism (Fig. 4, not shown) is provided to retract the needles 108 within the slots in the stator bore 16 during each reciprocating movement. The reciprocating arm 72 is driven by a lever 164 (Fig. 6) pivoted at 176 and driven by a reciprocating slide 174 which in turn is driven by a grooved cam 190 (Fig. 9) driven by a motor 220 via a magnetic clutch 216. The amplitude of oscillation of the needle-carrying arm 72 is adjustable by sliding the bearing bridge 178 (Fig. 6) along a support 180. This is done by means of a knob 187 coupled to a screw 184 engaging a nut 186. The plane of adjustment of the sliding bearing bridge 178 is parallel to the axis of lever 164 when arm 72 is in its bottom dead-centre position, so that adjustment of 187 does not affect the lowest limit of movement of arm 72. Angular oscillation of stator.-A grooved cam 212 (Fig. 9) reciprocates a slide 226 which is coupled at 228 to a lever 232 pivoted on a shaft 234. The other end of the lever 232 is coupled at 238 to an actuating slide 242 having a rack engaging the gear ring 48 attached to the stator jig. The cams 190, 212 are so shaped that movement of each slide 72, 242 takes place only when the other is in its dead centre position. The amplitude of angular oscillation of the stator is adjusted by lateral movement of the shaft 234 which is coupled to a slide block 272. This adjustment is achieved by means of a servomotor 262 driving a cam 248 controlling the longitudinal position of a slide 244. The slide block 272 is clamped by pneumatic means, not shown, under control of a magnetic valve 292 when the servomotor is not energized. Formation of coil ends.-Deflectors 74 (Fig. 13) are formed in the clamp 76 and carry deflection wires 300 to ensure that the wires are displaced outside the guide fingers 34 during angular rotation of the stator. Similar deflection arrangements are provided on the underside of the stator. Sequence of operations.-When the homing key 282 (Fig. 9) is depressed, a pneumatic valve 290 is operated, releasing the stator clamp 76. Servo motor 262 drives cam 248 and so adjusts the position of shaft 234 to correspond to the angular span of the first coil to be wound. Servomotor 262 is stopped by a cam-operated switch 270. The stator is placed in the jig and the start key 286 depressed. The pneumatic valve 290 applies clamp 76 and a limit switch 296 energizes the magnetic clutch 216, coupling the motor 220 via gears 214, 210 (shown apart in Fig. 9) to cams 212, 190. The number of turns required on each coil is pre-set by switches 306, 308 and 310 associated with a counter 304. When the first coil has been wound, the clutch 216 is released and the magnetic valve 292 reversed to release the clamp (not shown) on the slide 272 carrying the shaft 234. Servomotor 262 now drives the cam 248 to adjust the position of shaft 234 to a setting corresponding to the angular pitch of the second coil. This is determined by the cam 266 opening switch 270. Valve 292 again clamps the slide block 272 and hence shaft 234. Switches 316 control the speed of winding each coil. The total number of coils on the stator is controlled by switch 312. A foot-controlled pneumaticallyoperated wire cutter may be included.