Electric machine

Patent metadata

Field	Value
Publication number	US-12580446-B2
Application number	US-202318318562-A
Country	US
Kind code	B2
Filing date	May 16, 2023
Priority date	May 19, 2022
Publication date	Mar 17, 2026
Grant date	Mar 17, 2026

Abstract

An electric machine is provided including a stator, which is contained in a cooling jacket surrounding the stator about a periphery thereof, which cooling jacket is contained in a housing, wherein a plurality of outwardly protruding webs are provided on an outside of the cooling jacket, projecting in a direction of an inner wall of the housing, while between the webs and the inner wall there is provided a material which increases in volume to have an enlarged state at least during operation of the electric machine, closing a gap between each of the respective webs and the inner wall when in the enlarged state.

First claim

The invention claimed is:

1 . An electric machine, comprising:
a stator, which is contained in a cooling jacket surrounding the stator about a periphery thereof, wherein the cooling jacket is contained in a housing, wherein a plurality of outwardly protruding webs are provided on an outside of the cooling jacket projecting in a direction of an inner wall of the housing, wherein between the plurality of outwardly protruding webs and the inner wall there is provided a material which increases in volume to have an enlarged state at least during operation of the electric machine, closing a gap between each respective one of the plurality of outwardly protruding webs and the inner wall when in the enlarged state, and wherein prior to and during operation of the electric machine at least some of the material which increases in volume is positioned between an outermost surface of the outwardly protruding webs and the inner wall of the housing.

2 . The electric machine according to claim 1 , wherein the material increases in volume in dependence on a temperature of the material or a fluid wetting the material.

3 . The electric machine according to claim 2 , wherein the material increases in volume upon contact with a coolant flowing through cooling ducts formed by the plurality of outwardly protruding webs between the cooling jacket and the housing.

4 . The electric machine according to claim 1 , wherein the material is placed only on top sides of the plurality of outwardly protruding webs, or the material is placed on the inner wall of the housing.

5 . The electric machine according to claim 1 , wherein the plurality of outwardly protruding webs run in a ring about a periphery of an outside of the cooling jacket, or in a longitudinal direction of the cooling jacket.

6 . The electric machine according to claim 4 , wherein the material is glued in the form of a band to the top sides of the plurality of outwardly protruding webs or the inner wall of the housing.

7 . The electric machine according to claim 1 , wherein a thickness of the material in a non-enlarged state is such that a gap is formed between the material and the inner wall of the housing or the top sides of the plurality of outwardly protruding webs.

8 . The electric machine according to claim 1 , wherein, after the material transitions to the enlarged state, the material retains an enlarged shape permanently.

9 . The electric machine according to claim 1 , wherein the material is a plastic or a material based on plastic or containing cellulose.

10 . The electric machine according to claim 9 , wherein the material is a cellulose-containing material bound in a plastic.

11 . The electric machine according to claim 7 , wherein the gap has a width of 0.05 to 1.0 mm.

Assignees

• Audi Ag

Inventors

• Eichinger Benjamin
• Häckl Daniel

Classifications

• H02K5/203 Primary

  specially adapted for liquids, e.g. cooling jackets · CPC title

• H02K9/19

  for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil · CPC title

• H02K5/24 Primary

  specially adapted for suppression or reduction of noise or vibrations · CPC title

• H02K5/02 Primary

  Casings or enclosures characterised by the material thereof · CPC title