# US 10,770,949 B2 · Electric machine and motor vehicle

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- Number: US 10,770,949 B2
- Document ID: US10770949B2
- Status: Granted
- Kind: B2
- Application number: 15/976,155
- Filed: 2018-05-10
- Published: 2019-01-03
- Granted: 2020-09-08
- Earliest claimed: 2017-06-30
- Assignees: Audi AG
- Applicants: Audi AG
- Inventors: Albert Scharlach
- Web page: https://patentgrep.com/patent/US10770949B2

## CPC

- H02K 9/19: for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil
- H02K 1/32: with channels or ducts for flow of cooling medium
- H02K 5/203: {specially adapted for liquids, e.g. cooling jackets}
- H02K 9/193: with provision for replenishing the cooling medium; with means for preventing leakage of the cooling medium
- H02K 9/197: in which the rotor or stator space is fluid-tight, e.g. to provide for different cooling media for rotor and stator
- H02K: DYNAMO-ELECTRIC MACHINES (dynamo-electric relays H01H53/00; conversion of DC or AC input power into surge output power {H03K3/53})

## Abstract

An electric machine with a housing, in which a stator having a plurality of winding heads is arranged. The housing has at least one cooling channel through which can flow a cooling medium. The cooling channel has at least one circular-shaped or circular-segment-shaped annular channel section, by way of which the cooling medium can be introduced to at least one winding head through at least one opening.

## Claims

### Claim 1

An electric machine with a housing, comprising:
a stator having a plurality of winding heads,
wherein the housing has at least one cooling channel through which a cooling medium can flow,
wherein the at least one cooling channel proceeds at least partially around an annulus of the housing in an annular channel section,
wherein the annular channel section forms at least one circular-shaped or circular-segment-shaped section around the annulus of the housing,
wherein the at least one cooling channel comprises at least one opening by way of which the cooling medium is introduced to at least one winding head.

### Claim 2 (depends on 1)

The electric machine according to claim 1, wherein the at least one opening is a nozzle, through which the cooling medium can be introduced to at least one winding head by spraying.

### Claim 3 (depends on 1)

The electric machine according to claim 1, wherein the cooling medium can be introduced by way of the annular channel section at least to one winding head lying on top in the installed position of the electric machine.

### Claim 4 (depends on 1)

The electric machine according to claim 1, wherein the cooling medium can be introduced via the annular channel section to a plurality of winding heads disposed at a distance from one another in the circumferential direction of the electric machine.

### Claim 5 (depends on 1)

The electric machine according to claim 1, wherein the cooling channel comprises two annular channel sections, which are distanced from one another in the longitudinal direction of the electric machine, wherein the cooling medium can be introduced via one of the annular channel sections at least to one winding head on one side of the stator, and the cooling medium can be introduced via the other annular channel section at least to one winding head on the other side of the stator.

### Claim 6 (depends on 5)

The electric machine according to claim 5, wherein the cooling channel has at least one connection section that joins the two annular channel sections to one another.

### Claim 7 (depends on 1)

The electric machine according to claim 1, wherein the housing has at least one connection communicating with the cooling channel for the introduction of the cooling medium.

### Claim 8 (depends on 1)

The electric machine according to claim 1, further comprising:
a shaft with a shaft cooling channel, wherein the cooling channel is connected to the shaft cooling channel.

### Claim 9 (depends on 1)

The electric machine according to claim 1, wherein the cooling medium is an electrically insulating liquid, in particular, a cooling oil.

### Claim 10 (depends on 1)

The electric machine according to claim 1, wherein the housing has an additional cooling channel through which can flow another cooling medium, in particular, cooling water, wherein the additional cooling channel runs adjacent to the cooling channel, at least in sections.

### Claim 11 (depends on 1)

The electric machine according to claim 1, wherein the housing is composed of one piece, or the housing is composed of at least two housing components.

### Claim 12 (depends on 1)

A motor vehicle comprising at least one electric machine according to claim 1.