# US 2018/0323685 A1 · Electric Machine

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- Number: US 2018/0323685 A1
- Document ID: US20180323685A1
- Status: Published application
- Kind: A1
- Application number: 16/031,649
- Filed: 2018-07-10
- Published: 2018-11-08
- Earliest claimed: 2016-01-11
- Assignees: Bayerische Motoren Werke Aktiengesellschaft
- Applicants: Bayerische Motoren Werke Aktiengesellschaft
- Inventors: Julian BLUM; Andreas HUBER; Markus LANG; Joerg MERWERTH; Angusto GUCCIONE
- Web page: https://patentgrep.com/patent/US20180323685A1

## CPC

- H02K 3/38: around winding heads, equalising connectors, or connections thereto
- H02K 9/227: {Heat sinks}
- H02K 15/12: Impregnating, moulding insulation, heating or drying of windings, stators, rotors or machines
- 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 has a housing and has a stator inside the housing, surrounding a rotor arranged on a motor shaft so as to be fixed to the shaft. A rotary field winding, at the ends of the stator, forms a winding head. The winding heads are embedded in a thermally conductive encapsulation material, wherein the encapsulation material is in thermal contact with the housing along the outer circumference of the winding head. A segmented cooling plate is arranged on the inner circumference of the encapsulation winding head.

## Claims

### Claim 1

An electric machine, comprising:
a housing;
a stator arranged within the housing;
a rotor arranged fixedly on a motor shaft, the stator surrounding the rotor and having a rotating-field winding which forms one winding head at each face side of the stator, wherein the winding heads at the face sides are embedded in a thermally conductive encapsulation material, the thermally conductive encapsulation material is, along an outer circumference of each winding head, in thermal contact with the housing; and
a segmented cooling plate arranged on an inner circumference of each of the encapsulated winding heads.

### Claim 2 (depends on 1)

The electric machine as claimed in claim 1, wherein
segmentation of the cooling plate is formed by a number of recesses.

### Claim 3 (depends on 2)

The electric machine as claimed in claim 2, wherein
the recesses are formed as axial slots.

### Claim 4 (depends on 1)

The electric machine as claimed in claim 1, wherein
the cooling plate is a comb-shaped cooling plate with a number of plate teeth extending axially toward an opposite face side.

### Claim 5 (depends on 1)

The electric machine as claimed in claim 1, wherein
the cooling plate is arranged at least partially within the encapsulation material.

### Claim 6 (depends on 4)

The electric machine as claimed in claim 4, wherein
the cooling plate is arranged at least partially within the encapsulation material.

### Claim 7 (depends on 1)

The electric machine as claimed in claim 1, wherein
heat is removed from the housing by a cooling arrangement.

### Claim 8 (depends on 7)

The electric machine as claimed in claim 7, wherein
the cooling arrangement is a water or oil cooling arrangement.

### Claim 9 (depends on 1)

The electric machine as claimed in claim 1, wherein
the cooling plate is made of an aluminum material.

### Claim 10

An electric machine, comprising:
a housing;
a stator arranged within the housing;
a rotor arranged fixedly on a motor shaft, wherein the stator surrounds the rotor and has a rotating-field winding which forms a winding head at each face side of the stator;
a thermally conductive encapsulation material in which at least one winding head is embedded, the encapsulation material being in thermal contact with the housing along an outer circumference of the winding head; and
a segmented cooling plate arranged on an inner circumference of the thermally conductive encapsulation material in which the winding head is embedded.

### Claim 11 (depends on 1)

A motor vehicle, comprising an electric machine as claimed in claim 1.

### Claim 12 (depends on 11)

The motor vehicle as claimed in claim 11, wherein the motor vehicle is an electric or hybrid motor vehicle.