Patent ID: 7091645
Filing Date: 2006-08-15
Classification: H02K,Y10T

Abstract:
1. A concentrated-winding type stator coil unit for a rotary electric machine, comprising: a stator core having a core back and teeth protruding from the core back; and a plurality of coils wound around the teeth respectively, each of the coils being composed of a plurality of layered coils consisting of one or more pairs of layered coils consisting of a first layered coil formed by winding an insulation-coated coil wire in a layer around each of the teeth to form a plurality of turns arranged on each tooth and a second layered coil formed by winding the coil wire in a layer to form a plurality of turns arranged on each of the first layered coils wound around the teeth respectively, wherein the coil wire is wound to allow a last turn of the first layered coil to continue to a first turn of the second layered coil and both ends of the coil wire are located at and on a base portion of each of the teeth so that both ends serve as a winding-start end and a winding-finish end of each of the coils, the first turn of the second layered coil has a coil-bent portion bent toward a tip portion of each of the teeth, a second turn of the second layered coil has another coil-bent portion first bent toward the base portion of each of the teeth and then bent toward the tip portion thereof so that the second turn is juxtaposed to the first turn in a radial direction of the stator core, and one or more other remaining turns of the second layered coil, which continues in turn to the second turn, each has another coil-bent portion first bent toward the base portion of each of the teeth and then bent toward the tip portion thereof so that the remaining turns are juxtaposed in sequence to the second turn in the radial direction of the stator core.