Stator for an electric motor with at least one pocket for receiving a temperature monitoring element

Patent metadata

Field	Value
Publication number	US-12525852-B2
Application number	US-202318211459-A
Country	US
Kind code	B2
Filing date	Jun 19, 2023
Priority date	Jun 24, 2022
Publication date	Jan 13, 2026
Grant date	Jan 13, 2026

Abstract

A stator for an electric motor having stator teeth arranged about an axis of rotation, which are each wound with a winding, and at least one heat-conductive contact element, wherein the at least one contact element extends in the axial direction from a region adjoining the windings in the axial direction in each case between two windings and is formed to be deformable and/or deflectable in the circumferential direction for direct contact with at least one of the windings. The windings are overmolded or remolded with an electrically non-conductive material forming an encapsulation, which material forms with the at least one contact element in each case a pocket for receiving a temperature monitoring element which can be inserted in the axial direction, the winding-side wall of which is formed at least in a section by the contact element directly abutting the winding.

First claim

The invention claimed is:

1 . A stator for an electric motor comprising:
teeth arranged about an axis of rotation, each of which is wound with a winding, and at least one thermally conductive contact element, wherein the at least one contact element extends from a region adjoining the windings in the axial direction in each case between two windings and is configured to be deformable and/or deflectable in the circumferential direction for direct contact with at least one of the windings, wherein the at least one contact element has a smaller extension in an undeformed state in the circumferential direction about the axis of rotation than a distance in the circumferential direction of the two windings from one another, wherein the windings are overmolded or remolded with an electrically non-conductive material forming an encapsulation, which material forms with the at least one contact element in each case a pocket for receiving a temperature monitoring element which can be inserted in the axial direction, the pocket having a winding-side wall that is formed at least in a section by the contact element directly abutting the winding.

2 . The stator according to claim 1 ,
wherein the at least one contact element has in each case two tongues extending in the axial direction between the two windings, of which a first tongue for direct contact with a first of the two windings in a first circumferential direction and a second tongue for direct contact with a second of the two windings in an opposite second circumferential direction is formed to be deformable and/or deflectable, and the wall of the pocket formed with the contact element is formed in a first section by the first tongue directly abutting the first winding and in a second section by the second tongue directly abutting the second winding.

3 . The stator according to claim 2 ,
wherein the two tongues surround the pocket in the circumferential direction and are separated by a slot extending in the radial direction.

4 . The stator according to claim 2 ,
wherein the electrically non-conductive material extends between the two tongues and through the slot.

5 . The stator according to claim 2 ,
wherein the tongues run toward one another starting from the region adjoining the windings in the axial direction.

6 . The stator according to claim 1 ,
further having a switching disk which is arranged in the region adjoining the windings in the axial direction, wherein the at least one contact element is fixed to the switching disk by its respective side extending from the region between the two windings and is formed integrally with the switching disk.

7 . The stator according to claim 6 ,
wherein the switching disk is overmolded or remolded together with the windings with the electrically non-conductive material.

8 . The stator according to claim 1 ,
wherein in each case at least one temperature monitoring element is arranged in the respective pocket in such a way that this element directly abuts the section of the contact element forming the wall of the pocket opposite the respective winding.

9 . An electric motor with a stator according to claim 1 .

10 . A method of manufacturing a stator according to claim 1 ,
wherein the at least one contact element is pushed in contact-free manner relative to the windings between two windings in each case, so that the contact element extends from the region adjoining the windings in the axial direction between the windings without touching them, wherein a core is pushed from the axially adjoining region in the axial direction into and/or against the contact element, the contact element is deformed and/or deflected by the core in the circumferential direction and is pressed directly against at least one winding.

11 . The method according to claim 10 ,
wherein the windings, the at least one contact element and the core are overmolded or remolded with the electrically non-conductive material to form the encapsulation and the respective pocket is formed for each contact element.

12 . The method according to claim 10 ,
wherein the core is formed as a negative of the pocket.

13 . The stator according to claim 1 ,
wherein the region adjoining the windings projects axially from an axial end surface of the windings.

14 . The stator according to claim 1 ,
wherein the at least one contact element projects axially away from the windings.

15 . The stator according to claim 1 ,
wherein the at least one contact element, in the undeformed state, does not abut the two windings.

Assignees

• Ebm Papst Mulfingen Gmbh & Co Kg

Inventors

• Letter Tobias
• Schmidt Madlene

Classifications

• H02K1/146

  consisting of a generally annular yoke with salient poles · CPC title

• G01K13/08

  in rotary movement · CPC title

• G01K1/18

  for reducing thermal inertia · CPC title

• H02K15/12

  Impregnating, moulding insulation, heating or drying of windings, stators, rotors or machines · CPC title

• G01K1/14

  Supports; Fastening devices; Arrangements for mounting thermometers in particular locations · CPC title