Electric machine with distributed winding having double cross end loops

Patent metadata

Field	Value
Publication number	US-10998788-B2
Application number	US-201916258270-A
Country	US
Kind code	B2
Filing date	Jan 25, 2019
Priority date	Jan 25, 2019
Publication date	May 4, 2021
Grant date	May 4, 2021

Abstract

An electric machine a stator having a stator core and windings positioned thereon. The stator core has a plurality of slots formed therein and a winding positioned in the plurality of slots. The winding includes at least four parallel paths distributed in slot sets of the stator core. Each slot set includes at least four contiguous slots including two left slots and two right slots. A first parallel path and a second parallel path are arranged in the two left slots for at least a first revolution of the winding around the core. The first parallel path and the second parallel path are arranged in the two right slots for at least a subsequent revolution of the winding around the core.

First claim

What is claimed is:

1. A stator for an electric machine comprising:
a stator core having a plurality of slots formed therein; and
a stator winding including at least a first phase winding, a second phase winding and a third phase winding positioned in the plurality of slots, the stator winding comprising end loops extending between conductors in each slot, each of the end loops defined by an end loop pitch, the first phase winding including at least four parallel paths distributed in slot sets of the stator core, each slot set comprising at least four contiguous slots including two left slots and two right slots, a first parallel path and a second parallel path arranged in the two left slots for a first slot set and a second slot set of a first revolution around the core, and the first parallel path and the second parallel path are arranged in the two right slots for a third slot set and a fourth slot set of a subsequent revolution around the core.

2. The stator of claim 1 further comprising a third parallel path and a fourth parallel path arranged in the two right slots for the first the first slot set and the second slot set and in the two left slots for the third slot set and the fourth slot set.

3. The stator of claim 2 wherein the first parallel path and the second parallel path are arranged in the two left slots for at least the first revolution around the core and arranged in the two right slots for at least the second revolution around the core, and the third parallel path and fourth parallel path are arranged in the two right slots for at least the first revolution around the core and arranged in the two left slots for at least the second revolution around the core.

4. The stator of claim 3 wherein the first revolution around the core is in the clockwise direction and the second revolution around the core is in the counter-clockwise direction.

5. The stator of claim 1 wherein at least four conductors are positioned in each of the plurality of slots, the at least four conductors in each slot all associated with a single phase of the at least one stator winding.

6. The stator of claim 1 wherein the most of end loops are defined by end loop pitches of twelve.

7. The stator of claim 6 wherein at least two of the end loops are defined by end loop pitches of fourteen, wherein said fourteen pitch end loops transition the first parallel path and the second parallel path from the two left slots to the two right slots.

8. The stator of claim 1 wherein the first parallel path and the second parallel path switch between outer-left slots and inner-left slots of the slot sets of the stator core for the first slot set and the second slot set.

9. The stator of claim 8 wherein eleven pitch and thirteen pitch end loops switch the first parallel path and the second parallel path between the outer-left slots and the inner-left slots of the slot sets for the first slot set and the second slot set.

10. A stator for an electric machine comprising:
a stator core having a plurality of slots formed therein; and
a stator winding including at least a first phase winding, a second phase winding and a third phase winding positioned in the plurality of slots, the first phase winding including at least four parallel paths, each parallel path including in-slot conductors connected by end loops, each of the end loops defined by an end loop pitch, and each parallel path including at least three different end loop pitches, the at least four parallel paths distributed in slot sets of the stator core, each slot set comprising at least four contiguous slots including two left slots and two right slots, the at least four parallel paths including a first parallel path and a second parallel path arranged in the two left slots for a first slot set and a second slot set of a first revolution around the core, and the first parallel path and the second parallel path arranged in the two right slots for a third slot set and a fourth slot set of a subsequent revolution around the core.

11. The stator of claim 10 wherein a set of double crossed end loops switches a position of a two left parallel paths between a leftmost position and a middle-left position and switches a position of two right parallel paths between a rightmost position and a middle-right position.

12. The stator of claim 11 wherein most of the end loops of each parallel path are defined by an end loop pitch of twelve, wherein at least two of the end loops of each parallel path are defined by an end loop pitch of eleven and thirteen, and wherein one of the end loops of each parallel path is defined by an end loop pitch of ten or fourteen.

13. The stator of claim 10 wherein a direction of winding progression for the plurality of parallel paths reverses at a set of nested double-crossed end loops.

14. The stator of claim 10 wherein the at least three different coil end loop pitches include pitches that range from N−3 to N+3 pitch.

15. The stator of claim 14 wherein N equals 12.

16. The stator of claim 14 wherein the at least three different coil end loop pitches include pitches that range from N−2 to N+2.

17. The stator of claim 16 wherein N equals 12.

18. The stator of claim 14 wherein the at least three different end loop pitches includes at least four different end loop pitches, and wherein the at least four different end loop pitches include an N pitch, an N−1 pitch an N+1 pitch and a fourth pitch.

19. The stator of claim 18 wherein the fourth pitch is an N+2 pitch or an N+3 pitch.

Assignees

• Borgwarner Inc

Inventors

• Neet Kirk
• Husain Tausif

Classifications

• B60K2006/268

  Electric drive motor starts the engine, i.e. used as starter motor · 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

• B60K6/26

  characterised by the motors or the generators · CPC title

• Y02T10/62

  Hybrid vehicles · CPC title

• H02K3/12 Primary

  arranged in slots · CPC title