Stator of rotating electrical machine

• US 8,736,132 B2
• Filed: 04/27/2011
• Issued: 05/27/2014
• Est. Priority Date: 04/27/2010
• Status: Active Grant

• Current Assignee: DENSO Corporation
• Original Assignee: DENSO Corporation
• Inventors: Taniguchi, Makoto, Kondou, Keiji, Akimoto, Akito
• Primary Examiner(s): NGUYEN, TRAN N
• Application Number:
  US13/094,972
• Publication Number:
  US 20110260570A1
• Time in Patent Office: 1,126 Days
• Field of Search: 310/201
• US Class Current: 310/201
• CPC Class Codes: H02K 15/0081 for form-wound windings
• 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 turn part of a lead wire includes a projection part, a slope part and a second bent part. The projection part projects from a first slot to a direction parallel to an axial direction of the stator core. The slope part is diagonally extended at an angle of less than 90 degrees aiming to a Kth slot. The Kth slot is separated from the first slot at a specific interval via a first bent part that is bent in a circumferential direction from a tip of the projection part. The second bent part is connected with the slot accommodation part accommodated in the Kth slot, and is bent to the direction parallel to the axial direction of the stator core from a tip of the slope part.

Claims

1. A stator of a rotating electrical machine comprising:

a stator core with an annular shape having a plurality of slots in a circumferential direction; and

a stator winding formed by winding a plurality of lead wire around the stator core;

wherein, the lead wire has a slot accommodation part accommodated in the slot and a turn part that mutually connects the slot accommodation parts that are accommodated in the different slot in a circumferential direction outside of the slot; and

bent parts are formed to two positions of the turn part and the turn part is formed in non-symmetric shape in the circumferential direction;

wherein;

the turn part comprises;

a projection part that projects from a first slot in a direction parallel to an axial direction of the stator core;

a slope part bent in a circumferential direction from a tip of the projection part and diagonally extended at an angle of less than 90 degrees aiming to a Kth slot (K is a natural number) that is separated from the first slot at a specific interval;

the stator winding has m phases (m is a natural number), has a number of slots n (n is a natural number) per phase and per pole, and has 2p magnetic poles;

a total number of the slots in the stator core is m×

n×

2p (p is a natural number) and the k is m×

n+1;

the lead wire is a continuous line that winds around once around the stator core by repeating the projection part and the slope part 2p times at the interval of the first slot and Kth slot; and

when the lead wire winds around the stator core by J turns (J is a natural number), at least two slot accommodation parts of the 2p slot accommodation parts in the same turn have the same radial distance from an axial center of the stator core.

2. The stator of the rotating electrical machine according to claim 1, wherein, a second slope part of a second lead wire over-laps an anti-stator core side of the first slope part of a first lead wire extended from the first slot, wherein the second slope part is extended from a second slot that is adjacent to the first slope part side of the first slot.

3. The stator of the rotating electrical machine according to claim 1, wehrein at least one of the slope part of another lead wire that does not overlap on the slope part of the own lead wire is visible in a group of the slope parts that composes the inner most or outer most layer when a coil end of the stator winding is viewed from the axial direction.

4. The stator of the rotating electrical machine according to claim 1, wherein, the turn part is provided with a first crank section that is bent outside in a radial direction of the stator core formed in at least one of either the first bent part formed between the projection part and the slope part, or the slope part.

5. The stator of the rotating electrical machine according to claim 4, wherein, at least one portion of the slope part of the turn part is provided with a second crank section that is bent inside in a radial direction of the stator core.

6. The stator of the rotating electrical machine according to claim 5, wherein, an interval in a circumferential direction between the first crank section and the second crank section is set to differ in m×

n turn parts in the one magnetic pole pitch.

7. The stator of the rotating electrical machine according to claim 1, wherein, the number of the turn parts where the slope part over-laps is m×

n.

8. The stator of the rotating electrical machine according to claim 4, wherein, a coil end of the stator winding has a protruding section that is a part of an outer most turn part protrudes outside in a radial direction.

9. The stator of the rotating electrical machine according to claim 4, wherein, a coil end of the stator winding has a protruding section that is a part of an inner most turn part protrudes inside in a radial direction.

10. The stator of the rotating electrical machine according to claim 1, wherein, the number of the lead wires that compose the stator winding is 2×

m×

n, and at least m×

n lead wires begin winding from adjoining m×

n slots of the stator core.

11. The stator of the rotating electrical machine according to claim 1, wherein, the number of the lead wires that compose the stator winding is 2×

m×

n, and 2×

m×

n lead wires begin winding from adjoining 2×

m×

n slots of the stator core.

12. The stator of the rotating electrical machine according to claim 1, wherein, at least the slot accommodation part of the lead wire is a flat wire.

13. A stator of a rotating electrical machine comprising:

a stator core with an annular shape having a plurality of slots in a circumferential direction; and

a stator winding formed by winding a plurality of lead wire around the stator core;

wherein, the lead wire has a slot accommodation part accommodated in the slot and a turn part that mutually connects the slot accommodation parts that are accommodated in the different slot in a circumferential direction outside of the slot; and

bent parts are formed to two positions of the turn part and the turn part is formed in non-symmetric shape in the circumferential direction;

wherein, the turn part comprises;

a projection part that projects from a first slot in a direction parallel to an axial direction of the stator core, and

a slope part bent in a circumferential direction from a tip of the projection part and diagonally extended at an angle of less than 90 degrees aiming to a Kth slot (K is a natural number) that is separated from the first slot at a specific interval; and

wherein the turn part is provided with a first crank section that is bent outside in a radial direction of the stator core formed in at least one of either the first bent part formed between the projection part and the slope part, or the slope part.

14. The stator of the rotating electrical machine according to claim 13, wherein, at least one portion of the slope part of the turn part is provided with a second crank section that is bent inside in a radial direction of the stator core.

15. The stator of the rotating electrical machine according to claim 14, wherein, an interval in a circumferential direction between the first crank section and the second crank section is set to differ in m×

n turn parts in the one magnetic pole pitch.

16. The stator of the rotating electrical machine according to claim 13, wherein, a coil end of the stator winding has a protruding section that is a part of an outer most turn part protrudes outside in a radial direction.

17. The stator of the rotating electrical machine according to claim 13, wherein, a coil end of the stator winding has a protruding section that is a part of an inner most turn part protrudes inside in a radial direction.