# US 9,518,477 B2 · Cooling device for electric motor

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- Number: US 9,518,477 B2
- Document ID: US9518477B2
- Status: Granted
- Kind: B2
- Application number: 13/698,976
- Filed: 2011-05-18
- Published: 2013-08-15
- Granted: 2016-12-13
- Earliest claimed: 2010-05-21
- Assignees: BAE Systems Hägglunds Aktiebolag
- Applicants: Pontus Karlsson; Viktor Lassila
- Inventors: Pontus Karlsson; Viktor Lassila
- Web page: https://patentgrep.com/patent/US9518477B2

## CPC

- F01D 25/12: Cooling
- H02K 5/203: {specially adapted for liquids, e.g. cooling jackets}
- H02K 9/227: {Heat sinks}
- H02K 9/06: with fans or impellers driven by the machine shaft
- H02K 9/08: by gaseous cooling medium circulating wholly within the machine casing (H02K9/10 takes precedence)
- F01D: NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES (machines or engines for liquids F03; non-positive displacement pumps F04D)
- H02K: DYNAMO-ELECTRIC MACHINES (dynamo-electric relays H01H53/00; conversion of DC or AC input power into surge output power {H03K3/53})

## Abstract

A device for cooling of electric motor, which has a stator with a jacket surface/stator back, wherein a housing is arranged to surround the stator, includes at least one cooling channel in which a liquid cooling medium streams for cooling of the electric motor, wherein the housing is arranged to run separated from the stator along a main part of the thermoset cased jacket surface of the stator for forming of said cooling channel between the housing and said jacket surface, wherein the stator winding of the stator is arranged to run along and axially project from and turn outside of said jacket surface, wherein the stator including the projecting stator winding is embedded with said thermoset, wherein said cooling channel also is formed between the housing and the thus projecting stator winding.

## Claims

### Claim 1

A device for cooling of an electric motor comprising a stator with a jacket surface, the device comprising:
a thermoset layer made of a heat conducting thermoset, the thermoset layer covering the jacket surface of the stator, which is an outer surface of the stator,
a housing arranged to surround the stator and the thermoset layer,
a cooling channel in which a liquid cooling medium is configured to stream for cooling of the electric motor, the cooling channel as a whole having a shape of a cylinder extending in a longitudinal direction of the electric motor, and the cooling channel being only one cooling channel appearing in a sectional view of the cooling device cut in the longitudinal direction,
wherein the housing is arranged to run separated from the thermoset layer covering the stator along a main part of the jacket surface of the stator for forming of said cooling channel between the housing and the thermoset layer,
wherein the stator is attached to a stator winding, and the stator winding of the stator is arranged to run along and axially project from the stator and turn outside of said stator,
wherein the stator including the projecting stator winding is embedded with said thermoset layer,
wherein said cooling channel is formed between the housing and the thus projecting stator winding,
wherein the channel has a first end and the thermoset layer has a first end on a side of the device in the longitudinal direction, and the channel has a second end and the thermoset layer has a second end on the other side of the device in the longitudinal direction, the first end of the thermoset layer extending beyond the first end of the cooling channel, and the second end of the thermoset layer extending beyond the second end of the cooling channel,
wherein the housing is sealingly connected to said thermoset layer by a sealing member at a portion between the first end of the cooling channel and the first end of the thermoset layer and a portion between the second end of the cooling channel and the second end of the thermoset layer, and
wherein said cooling channel is enclosed in the housing in the longitudinal direction so that both ends of the cooling channel in the longitudinal direction are covered by the housing.

### Claim 2 (depends on 1)

A device according to claim 1, wherein said thermoset is constituted by epoxy.

### Claim 3 (depends on 1)

A device according to claim 1, wherein said liquid cooling medium is constituted by water.

### Claim 4 (depends on 1)

A device according to claim 1, wherein said liquid cooling medium is arranged to stream essentially axially in said cooling channel.

### Claim 5 (depends on 4)

A device according to claim 4, comprising support elements arranged to run axially between the housing and the thermoset layer forming axial cooling channel portions of said cooing channel.

### Claim 6 (depends on 1)

A device according to claim 1, wherein said liquid medium is arranged to stream essentially circumferentially in said cooling channel.

### Claim 7 (depends on 6)

A device according to claim 6, comprising support elements arranged to run circumferentially between the housing and the thermoset layer forming cooling channel portions of said cooling channel extending circumferentially.

### Claim 8 (depends on 1)

An electric motor comprising a cooling device according to claim 1.

### Claim 9 (depends on 8)

A motor vehicle comprising at least one electric motor according to claim 8.