Unit coil and method of manufacturing the same slot-less stator winding

摘要

PROBLEM TO BE SOLVED: To make assembly work for stator winding easy, by preventing interference between the coil ends of adjoining unit coils; and suppress necessary length of the projection of coil ends in the axial direction as minimum as possible, in the unit coil 4U, which constitutes a double-layered cylinder-like stator winding for a slot-less stator, and has a plurality of outer-layer coil sides U1, U3, U5 and U7; a plurality of inner-layer coil sides U2, U4 and U6; a plurality of coil ends U23, U45 and U67 on one side and a plurality of coil ends U12, U34 and U56 on the other side, which respectively bridge the outer-layer coil side and the inner-layer coil side.;SOLUTION: The coil end of the unit coil U4 is formed in a shape, which has a tangential-direction-bending part 4a on the side of the inner-layer coil side, which is bent in the tangential direction of the stator winding at the disposition of the inner-layer coil side; a radial-direction-bending part 4b of the outer- layer coil side, which is bent to the outer side in the radial direction; and a spiral part 4c which is spirally extended, having a slope angle inward in the axial direction of the stator winding toward the radial-direction-bending part 4b from the tangential-direction-bending part 4a.;COPYRIGHT: (C)2003,JPO