Patent ID: 8890387
Filing Date: 2014-11-18
Classification: H02K

Abstract:
1. A stator comprising an armature core and a segment coil, wherein the armature core has an annular portion, which defines an axial direction, a radial direction, and a circumferential direction, and a plurality of teeth extending from the annular portion in the radial direction, a slot being defined between teeth of adjacent pairs of teeth, the segment coil is configured by electrically connecting a plurality of segment conductors together, the segment conductors extending axially through the corresponding slots, the dimension of each slot in a direction perpendicular to the radial direction is defined as a slot width, each one of the teeth has a width adjustment portion for decreasing the slot width in the radially inward direction, the segment conductors are formed using wires having identical cross sections, each of the segment conductors is formed in a U shape and includes a first linear portion, a second linear portion, and a connecting portion for connecting the first linear portion to the second linear portion, the first linear portion extends through each slot at a circumferential position different from the circumferential position at which the second linear portion extends through the corresponding slot, the first linear portion is arranged in each slot at a radial position different from the radial position at which the second linear portion is located in the slot, the first linear portion is formed to follow the shape of the width adjustment portion with the cross-sectional area of the first linear portion maintained equal to the cross-sectional area of each of the wires, and the second linear portion is formed to follow the shape of the width adjustment portion with the cross-sectional area of the second linear portion maintained equal to the cross-sectional area of each wire.