Stator for an electric machine, method for producing a stator, and electric machine

Patent metadata

Field	Value
Publication number	US-2023253847-A1
Application number	US-202318299987-A
Country	US
Kind code	A1
Filing date	Apr 13, 2023
Priority date	Oct 14, 2020
Publication date	Aug 10, 2023
Grant date	—

Abstract

A stator for an electric machine of a motor vehicle, having an annular yoke, with an inner side directed inwards in the radial direction of the yoke, wherein a plurality of pole teeth are connected by form fit to the yoke on the inner side of the yoke, a stator winding which is formed as a mat and which is arranged between the pole teeth, a first cooling channel through which a cooling medium may flow and which extends in the longitudinal direction of the stator, wherein the first cooling channel is arranged in a recess, and a second cooling channel through which a cooling medium may flow, wherein the second cooling channel is arranged between two adjacent pole teeth between an inner side of the stator winding directed inwards in the radial direction of the stator and a pole shoe of the pole tooth.

First claim

What is claimed is:

1 . A stator for an electric machine of a motor vehicle, the stator comprising:
an annular yoke, with an inner side directed inwards in the radial direction of the annular yoke; a plurality of pole teeth are connected by form fit to the annular yoke on the inner side of the annular yoke, and the plurality of pole teeth are spaced apart from each other in the circumferential direction of the annular yoke; a stator winding which is formed as a mat and which is arranged between each of the plurality of pole teeth; a first cooling channel through which a cooling medium may flow and which extends in the longitudinal direction of the stator; and a recess which, starting from the inner side of the annular yoke, extends outwards between two adjacent pole teeth in the radial direction of the annular yoke, and the first cooling channel is arranged in the recess such that the first cooling channel rests at least in portions directly against a wall defining the recess and/or in portions directly against the stator winding.

2 . The stator of claim 1 , wherein the first cooling channel is guided as far as the inner side of the annular yoke.

3 . The stator of claim 1 , wherein the first cooling channel is guided starting from the recess into a space between the pole teeth.

4 . The stator of claim 1 , wherein the stator winding is formed in multiple layers relative to the radial direction of the stator, and is formed in a single layer between two pole teeth relative to the circumferential direction of the stator.

5 . The stator of claim 1 , wherein the first cooling channel is connected at the end side of the stator to a first annular channel.

6 . The stator of claim 1 , wherein the first cooling channel is formed from a plastics material.

7 . The stator of claim 1 , wherein the pole shoe of two adjacent pole teeth are formed without gaps.

8 . The stator of claim 1 , wherein each of the plurality of pole teeth are connected to the annular yoke via a dovetail connection.

9 . The stator of claim 1 , wherein the recess, relative to the cross-section of the annular yoke, is designed to widen outwards in a radial direction starting from the inner side.

10 . The stator of claim 1 , further comprising a second cooling channel through which a cooling medium may flow, wherein the second cooling channel is arranged between two adjacent plurality of pole teeth and between an inner side of the stator winding directed inwards in the radial direction of the stator and a pole shoe of at least one of the plurality of pole teeth, and the second cooling channel rests at least in portions directly against the stator winding and/or against the pole shoe.

11 . The stator of claim 10 , wherein the second cooling channel is connected at the end side of the stator to a second annular channel.

12 . The stator of claim 10 , wherein the second cooling channel is formed from a plastics material.

13 . The stator of claim 10 , the annular yoke further comprising:
a yoke outer side on an outer side directed outwards in the radial direction, and the stator is arranged in a housing, wherein a third cooling channel is formed between the yoke outer side and the housing.

14 . The stator of claim 13 , wherein the third cooling channel is fluidically connected to at least one of the first cooling channel or the second cooling channel.

15 . A method for producing a stator of claim 10 , comprising the steps of:
providing an annular yoke, with an inner side directed inwards in the radial direction of the annular yoke; providing a plurality of pole teeth are connected by form fit to the annular yoke on the inner side of the annular yok, and the plurality of pole teeth are spaced apart from each other in the circumferential direction of the annular yoke; providing a stator winding which is formed as a mat and which is arranged between each of the plurality of pole teeth; providing a first cooling channel through which a cooling medium may flow and which extends in the longitudinal direction of the stator; and providing a recess which, starting from the inner side of the annular yoke, extends outwards between two adjacent pole teeth in the radial direction of the annular yoke; providing a second cooling channel through which a cooling medium may flow; arranging the first cooling channel in the recess such that the first cooling channel rests at least in portions directly against a wall defining the recess and/or in portions directly against the stator winding; arranging the second cooling channel between two adjacent plurality of pole teeth and between an inner side of the stator winding directed inwards in the radial direction of the stator and a pole shoe of at least one of the plurality of pole teeth, such that the second cooling channel rests at least in portions directly against the stator winding and/or against the pole shoe; forming the first cooling channel and/or the second cooling channel by an overmolding process and/or a transfer molding process.

16 . The method of claim 15 , further comprising the step of forming the first cooling channel and/or the second cooling channel on the annular yoke after the pole teeth comprising the stator winding have been arranged by a form fit.

17 . An electric machine, comprising:
a stator, the stator further comprising:
an annular yoke, with an inner side directed inwards in the radial direction of the annular yoke;
a plurality of pole teeth are connected by form fit to the annular yoke on the inner side of the annular yoke, and the plurality of pole teeth are spaced apart from each other in the circumferential direction of the annular yoke;
a stator winding which is formed as a mat and which is arranged between each of the plurality of pole teeth;
a first cooling channel through which a cooling medium may flow and which extends in the longitudinal direction of the stator; and
a recess which, starting from the inner side of the annular yoke, extends outwards between two adjacent pole teeth in the radial direction of the annular yoke, and the first cooling channel is arranged in the recess such that the first cooling channel rests at least in portions directly against a wall defining the recess and/or in portions directly against the stator winding.

Assignees

• Vitesco Technologies Germany Gmbh

Inventors

• Haas Astrid
• Radtke Christoph
• Kreissig Udo
• Scharf Uwe
• Müller Ricus
• Nimpsch Alfred
• Lenk Andreas

Classifications

• 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

• H02K15/064

  Windings consisting of separate segments · CPC title

• H02K1/148 Primary

  Sectional cores (H02K1/141 takes precedence) · CPC title

• H02K3/12

  arranged in slots · CPC title

• H02K15/066

  inserted perpendicularly to the axis of the slots or inter-polar channels · CPC title