Rotating electric machine stator with multi-phase coil having phase winding coil end portions with different oblique angles

• US 9,899,887 B2
• Filed: 01/21/2015
• Issued: 02/20/2018
• Est. Priority Date: 02/07/2014
• Status: Active Grant

• Current Assignee: DENSO Corporation
• Original Assignee: DENSO Corporation
• Inventors: Tokizawa, Takashi
• Primary Examiner(s): Rojas, Bernard
• Assistant Examiner(s): Almawri, Maged
• Application Number:
  US14/601,375
• Publication Number:
  US 20150229174A1
• Time in Patent Office: 1,126 Days
• Field of Search: 310179-208, 29596, 29598, 29606, 29605, 2960323-60326
• CPC Class Codes: H02K 15/0031 Shaping or compacting conductors in slots or around salient poles H02K15/005 takes precedence
• CPC Class Codes: H02K 2213/03 Machines characterised by numerical values, ranges, mathematical expressions or similar information
• CPC Class Codes: H02K 3/00 Details of windings
• CPC Class Codes: H02K 3/12 arranged in slots
• CPC Class Codes: H02K 3/28 Layout of windings or of connections between windings windings for pole-changing H02K17/06, H02K17/14, H02K19/12, H02K19/32

Abstract

A stator includes a multi-phase stator coil comprised of phase windings. Each of the phase windings is formed of a continuous electric conductor and includes in-slot portions and coil end portions. Each of the in-slot portions is received in one of slots of a stator core. Each of the coil end portions is located outside the slots so as to connect one adjacent pair of the in-slot portions. Each of the coil end portions includes at least one oblique part that extends obliquely at an oblique angle with respect to either an axial direction or a circumferential direction of the stator core. The oblique angles of the oblique parts of the coil end portions in at least one of the phase windings of the stator coil are set to be different from the oblique angles of the oblique parts of the coil end portions in the other phase windings.

Claims

1. A stator for a rotating electric machine, the stator comprising:

a hollow cylindrical stator core having a plurality of slots that are formed in a radially inner surface of the stator core so as to be spaced from one another in a circumferential direction of the stator core; and

a multi-phase stator coil comprised of a plurality of phase windings, each of the phase windings being formed of a continuous electric conductor and including a plurality of in-slot portions and a plurality of coil end portions, each of the in-slot portions being received in a corresponding one of the slots of the stator core, each of the coil end portions being located outside the slots of the stator core so as to connect one circumferentially-adjacent pair of the in-slot portions,

wherein

the stator coil is mounted on the stator core so that for each of the phase windings, radial positions of the in-slot portions of the phase winding in the corresponding slots alternate between a radially inner position and a radially outer position in the circumferential direction of the stator core,

each of the coil end portions of the phase windings includes at least one oblique part that extends obliquely at an oblique angle with respect to either an axial direction of the stator core or the circumferential direction of the stator core,

the oblique angles of the oblique parts of the coil end portions in at least one of the phase windings of the stator coil are set to be different from the oblique angles of the oblique parts of the coil end portions in the other phase windings that are located a same distance from a corresponding axial end face of the stator core as the oblique parts of the coil end portions in the at least one of the phase windings,

each of the coil end portions of the phase windings of the stator coil has a mountain-like shape tapering axially outward,

for each of the coil end portions of the phase windings, the at least one oblique part of the coil end portion comprises a pair of first oblique parts and one second oblique part,

each of the first oblique parts extends obliquely with respect to the axial direction of the stator core and constitutes one side of the mountain-like shape of the coil end portion,

the second oblique part extends obliquely with respect to a radial direction of the stator core and constitutes an apex of the mountain-like shape which inter-connects the pair of first oblique parts, and

the oblique angles of the second oblique parts of the coil end portions in the at least one of the phase windings of the stator coil are set to be different from the oblique angles of the second oblique parts of the coil end portions in the other phase windings.

2. The stator as set forth in claim 1, wherein each of the phase windings of the stator coil is wave-shaped so that the coil end portions of the phase winding are located alternately on opposite axial sides of the stator core in the circumferential direction of the stator core.

3. The stator as set forth in claim 1, wherein the oblique angles of the first oblique parts of the coil end portions in the at least one of the phase windings of the stator coil are set to be different from the oblique angles of the first oblique parts of the coil end portions in the other phase windings.

4. The stator as set forth in claim 1, wherein each of the first oblique parts is stair-shaped to include a plurality of step parts that each extend substantially parallel to the corresponding axial end face of the stator core and are spaced from one another in the axial direction of the stator core.

5. The stator as set forth in claim 1, wherein the second oblique part extends substantially parallel to the corresponding axial end face of the stator core.