Patent GB-864603-A (GB)
Title: Process and apparatus for winding field coils
IPC: H02K15/085
Filed: 1959-06-23
Abstract: 864,603. Machines for winding dynamo-electric machines. BENDIX CORPORATION. June 23, 1959 [July 3, 1958], No. 21528/59. Class 35. A machine for winding dynamoelectric machine stators comprises means for angularly oscillating the stator core, a wire-laying shuttle reciprocating through the stator bore, and fingers moving radially, axially and circumferentially in a predetermined sequence at either end of the bore for guiding the wire into the correct slots. The oscillation of the stator and the motion of fingers is derived from cams which may be disengaged and other cams brought into operation for winding the various coils required. The motion of the fingers is used to pick up the wire from the reciprocating shuttle and deposit it in slots in end-turn forming rings, which may be subsequently broken and removed in pieces from the stator. As described, threephase windings are wound simultaneously. Oscillation of stator.-The stator core (not shown) is gripped in an indexed position in a stator nest assembly 25 comprising a nest member 26 in which the stator is indexed by a pin 404 is removably mounted in a split bearing 17. The nest member 26 carries a driving ring gear 29 secured by screws 28 and driven by a gear 31. Correct angular positioning of gears 29, 31 is ensured by an alignment assembly 33, Fig. 4, which prohibits meshing of the gears unless the stator nest assembly has been rotated to a suitable position at which an index pin 35 enters a slot 41 in an index collar 39 on the stator nest member. This pin is withdrawn on closure of the top half 43 of the split bearing 17 by the action of a pin 47 through lever 49, thus permitting rotation of the assembly. Misalignment in operation due to lost motion in the driving mechanism is prevented by an indexing pin 55 on the top half of the split bearing and engaging apertures in the indexing ring 39 representing the extreme angular positions of the stator where a dwell is required for passing the wire through the slots. The oscillation of the stator nest assembly is derived from one or other of cams 75, 76 which are axially slidable on lay-shaft 63 so that either may engage a follower pin 81 on a lever 83 which transmits motion through increasing gearing 91 (on a gear stud 89) and 93 on shaft 95 carrying gear 31 which meshes with the stator nest gear 29. In the embodiment described, cam 75 produces a stator oscillation of 160 degrees with dwells at the extreme positions for winding a first set of coils, while cam 76 produces an oscillation of 120 degrees for winding a second set of coils of shorter pitch. The cams are shifted by means of a sliding clevis 112 secured by a thumb nut 110. To re-adjust the angular position of the stator for winding the second set of coils, the gear 31 is axially displaced against spring 101 by a manually operated axially sliding plate 115 having projecting pins 121. This disengages the mesh with gear stator nest, gear 29 and allows the stator nest to be turned manually to the new position. Shuttle reciprocation.-The reciprocation of wire-laying shuttle 125 is derived from a cam 127 (on shaft 69 geared to shaft 63) through a lever 131, link 135 and increasing gearing 137, 138, 139, 140, to a rack-and-pinion drive (not shown) on the shuttle body which slides non- rotatably in a fixed bearing sleeve 146. The shuttle carries a cap 150 with three wire-laying nozzles 152 which reciprocate axially through the centre of the bore of the stator nest 25. (The stator is not shown in Fig. 3.) Wire hook assemblies.-On either side of the stator nest there are three (one for each phase) wire guiding fingers 164, 164A each having a wire hook pin 165, 165A respectively. These fingers are pivoted at 166, 166A on collars 163, 163A which are slidable on a fixed bearing member 157 and the outside surface of the shuttle guiding sleeve 146. Slidably mounted on collars 163, 163A are further collars 172, 172A having arms 171, 171A with rollers engaging the inner surfaces 168, 168A of the wire hook fingers for controlling their radial position, the inwardly directed restraining pressure being provided by springs 174, 174A. Relative motion of collar 172 on collar 163 and the axial position of collar 163 are controlled by the action of cams 180 and 190 on shaft 69 through links and arms 186, 199. This causes sequential motions of the fingers radially and towards and away from the stator nest. Similarly the motion of fingers 164A is controlled by cams 220, 250 on shaft 61 connected through gearing (not shown) to shaft 69. The cams 180, 190 and 220, 250 are axially slidable on their respective shafts 69, 61 and are arranged for winding the first coils of 160 degrees pitch only. For winding the second coils of 120 degrees pitch further cams 274, 276 (Fig. 5, not shown) and 270, 272 (Fig. 6, not shown) are moved along the shafts 69, 61 to replace them by manual means (not shown). Suitably phased angular oscillation of wire fingers 164 about the bearing sleeve 146 is produced by the action of a cam and linkage (310-324, not shown) on a pin 326 projecting from the sleeve 163 on which all the fingers are mounted. The fingers 164A are similarly oscillated by a cam and linkage (350-364, also not shown). Operation.-The winding end turns are supported by end turn forming rings 420, 422, Fig. 8, which may be left in place to secure the finished winding or broken and removed, the winding then being secured by slot wedges. To start winding, the stator 24 is placed in the bore of the stator nest assembly 25 and locked in position by a pin 404 depressed by a cam bar 406 retained by a screw 408. The turn forming rings are now attached on either side of the stator, and the whole stator nest assembly is assembled in the machine (Fig. 3). It is described how by the timed angular reciprocation of the stator and the rotational, radial and axial motion of the wire hook fingers, the shuttles are enabled to lay two sets of coils in the stator slots. A first set of coils of 160 degrees pitch which, of course, overlap each other, are wound in the inner slots 435, 437 of the forming rings, while a set of coils of 120 degrees, without overlap, are wound in the outer slots 439, 441.