Stator for rotating electric machine

Patent metadata

Field	Value
Publication number	US-9866083-B2
Application number	US-201514751924-A
Country	US
Kind code	B2
Filing date	Jun 26, 2015
Priority date	Jun 27, 2014
Publication date	Jan 9, 2018
Grant date	Jan 9, 2018

Abstract

A stator includes an annular stator core and a stator coil. The stator core has U-phase slots, V-phase slots and W-phase slots sequentially and repeatedly provided in pairs in its circumferential direction. The stator coil has U-phase, V-phase and W-phase windings respectively received in the U-phase, V-phase and W-phase slots. In each of the slots, there are received 2×N in-slot portions of a corresponding one of the phase windings in radial alignment with each other, where N≧2. Each of the phase windings consists of a pair of sub-windings connected parallel to each other. Each of the sub-windings includes winding sections that are classified into N winding section groups. Each of the winding sections of (N−1) winding section groups is connected via only serial connection, and each of the winding sections of the remaining one winding section group is connected via both serial connection and parallel connection.

First claim

What is claimed is:

1. A stator for a rotating electric machine, the stator comprising:
an annular stator core having a plurality of pairs of first-phase slots, a plurality of pairs of second-phase slots and a plurality of pairs of third-phase slots that are sequentially and repeatedly provided in a circumferential direction of the stator core; and
a stator coil comprised of a first-phase winding, a second-phase winding and a third-phase winding that are mounted on the stator core so as to be respectively received in the pairs of first-phase slots, the pairs of second-phase slots and the pairs of third-phase slots, the first-phase, second-phase and third-phase windings being Y-connected with each other,
wherein
in each of the first-phase, second-phase and third-phase slots of the stator core, there are received 2×N in-slot portions of a corresponding one of the first-phase, second-phase and third-phase windings of the stator coil in radial alignment with each other, where N is a natural number not less than 2,
each of the first-phase, second-phase and third-phase windings of the stator coil is comprised of a pair of sub-windings that are connected parallel to each other,
each of the sub-windings is comprised of a plurality of winding sections,
the winding sections are classified into N winding section groups including a first winding section group and a second winding section group, each of the winding sections of the first winding section group being arranged alternately at first and second layers in the corresponding phase slots of the stator core, each of the winding sections of the second winding section group being arranged alternately at third and fourth layers in the corresponding phase slots of the stator core, and
among the N winding section groups, each of the winding sections of (N−1) winding section groups is connected via only serial connection in the sub-winding, and each of the winding sections of the remaining one winding section group is connected via both serial connection and parallel connection in the sub-winding.

2. The stator as set forth in claim 1 , wherein each of those winding sections which are connected via only serial connection in the sub-winding has a first cross-sectional area,
each of those winding sections which are connected via both serial connection and parallel connection in the sub-winding has a second cross-sectional area, and
the second cross-sectional area is substantially half the first cross-sectional area.

3. The stator as set forth in claim 1 , wherein each of the pairs of first-phase slots consists of a first first-phase slot and a second first-phase slot,
each of the pairs of second-phase slots consists of a first second-phase slot and a second second-phase slot,
each of the pairs of third-phase slots consists of a first third-phase slot and a second third-phase slot,
each of the sub-windings of the first-phase winding is equally arranged in the first first-phase slots and the second first-phase slots,
each of the sub-windings of the second-phase winding is equally arranged in the first second-phase slots and the second second-phase slots, and
each of the sub-windings of the third-phase winding is equally arranged in the first third-phase slots and the second third-phase slots.

4. The stator as set forth in claim 3 , wherein each of those winding sections of the sub-windings of the first-phase winding which are connected via both serial connection and parallel connection is equally arranged in the first first-phase slots and the second first-phase slots,
each of those winding sections of the sub-windings of the second-phase winding which are connected via both serial connection and parallel connection is equally arranged in the first second-phase slots and the second second-phase slots, and
each of those winding sections of the sub-windings of the third-phase winding which are connected via both serial connection and parallel connection is equally arranged in the first third-phase slots and the second third-phase slots.

Assignees

• Denso Corp

Inventors

• Tamura Akito

Classifications

• H02K3/12

  arranged in slots · CPC title

• H02K3/28 Primary

  Layout of windings or of connections between windings (windings for pole-changing H02K17/06, H02K17/14, H02K19/12, H02K19/32) · CPC title