Stator coil and method of manufacturing the same

Abstract

The invention provides a stator coil (20), which can realize the high occupying rate of the coil terminal part at nearby of the core end-face and reduce the damage produced during assembling. The stator coil is formed continuously by a plurality of unit wave winding coils (21) in the radial direction, the unit wave winding coil makes the coil edge parts (21a) inserted in the slot (14) of the stator core (11) and the coil terminal parts (21b, 21c) protruding from the axial end-face of the stator core (11) to alternatively form at the circumference direction in a crawl bending mode to form a ring winding coil. The diameter of the circle pictured by a coil terminal part (21b) at one side end of the coil edge part is different from the diameter of the circle pictured by the coil terminal part(21c) of the other side end. The manufacturing method is to alternately enwind the wire (17) alternately on the first and second clamping parts, so as to make the wire to be crawl bending and winding.

Description

technical field [0001] The present invention relates to stator coils used in rotating electric machines. More specifically, the present invention relates to a wave winding stator coil in which coil sides inserted into slots of a stator core and coil ends protruding from the slots are alternately formed, and a method for manufacturing the same. Background technique [0002] Conventionally, the stator of a rotating electrical machine has a cylindrical stator core and a stator coil, wherein the stator core has a plurality of teeth (magnetic poles) arranged radially and protruding in the inner diameter direction and a plurality of slots opened therebetween; the stator coil, Assembled on the core by receiving the coil side in the slot. As for the assembly of the stator coil, a so-called embedding method is known, in which the stator coil and the stator core are manufactured separately in advance, and the coil is accommodated in each slot of the core. Also, a wave winding method...

AI Technical Summary

Problems solved by technology

Therefore, the coil end portion 4a existing on the inner side must draw a large arc to overlap the coil end portion 4a on the outer diameter side in the axial direction of the core 6, so it is difficult to fully discharge the coil end portion 4a as a whole. The outer diameter side of the stator core 6

In addition, there is also a problem that if the portion drawn with a large arc remains on the inner diameter side end face of the core, it will interfere with the coil end of the other stator coil assembled later.

That is, since the embedding device (not shown) converts the directions of the plurality of coil side portions 4c located in the plane into approximately right angles and erects them, the conversion angle is relatively large, and may affect the configuration of the coil side portions 4c when erected. The wire of coil 4 caused damage

The thicker the wire material constituting the wave winding coil 4, the more likely this damage will increase.

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