# US 2022/0045581 A1 · Method for producing a rotor for an electric rotating machine

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- Number: US 2022/0045581 A1
- Document ID: US20220045581A1
- Status: Published application
- Kind: A1
- Application number: 17/276,010
- Filed: 2019-09-17
- Published: 2022-02-10
- Earliest claimed: 2018-09-28
- Assignees: Siemens Aktiengesellschaft
- Applicants: Siemens Aktiengesellschaft
- Inventors: HORST KÜMMLEE; FRANK SEIBICKE
- Web page: https://patentgrep.com/patent/US20220045581A1

## CPC

- H02K 15/023: Cage rotors
- H02K 15/12: Impregnating, moulding insulation, heating or drying of windings, stators, rotors or machines
- H02K 17/168: {having single-cage rotors}
- H02K: DYNAMO-ELECTRIC MACHINES (dynamo-electric relays H01H53/00; conversion of DC or AC input power into surge output power {H03K3/53})

## Abstract

A method for producing a rotor for an electric rotating machine includes spraying in a rolling manner a first metallic material and a second metallic material, which is different from the first metallic material, onto at least part of a substantially cylindrical outer surface of a shaft body by a thermal spraying method to form on the shaft body a coating which forms at least part of a squirrel cage.

## Claims

### Claim at position 1

-15. (canceled)

### Claim 16

A method for producing a rotor for an electric rotating machine, said method comprising spraying in a rolling manner a first metallic material and a second metallic material, which is different from the first metallic material, onto at least part of a substantially cylindrical outer surface of a shaft body by a thermal spraying method to form on the shaft body a coating which forms at least part of a squirrel cage.

### Claim 17 (depends on 16)

The method of claim 16, wherein the thermal spraying method includes cold gas spraying.

### Claim 18 (depends on 16)

The method of claim 16, wherein the second metallic material is a soft-magnetic material.

### Claim 19 (depends on 16)

The method of claim 16, further comprising producing the shaft body from the second metallic material.

### Claim 20 (depends on 16)

The method of claim 16, wherein the at least part of the squirrel cage is formed by the first metallic material.

### Claim 21 (depends on 20)

The method of claim 20, wherein the squirrel cage is embedded completely into the rotor.

### Claim 22 (depends on 16)

The method of claim 16, wherein the first metallic material has a conductivity of more than 40 MS/m.

### Claim 23 (depends on 16)

The method of claim 16, wherein the first metallic material is sprayed with a first spraying device and the second metallic material is sprayed with a second spraying device.

### Claim 24 (depends on 16)

The method of claim 16, wherein the spraying of the first and second metallic materials in a rolling manner is implemented alternately and/or on an evolvent path.

### Claim 25 (depends on 16)

The method of claim 16, further comprising spraying a third material onto at least part of the substantially cylindrical outer surface of the shaft body such as to insulate the first and second metallic materials from one another.

### Claim 26 (depends on 25)

The method of claim 25, further comprising connecting at least two of the first and second metallic materials and the third material of the coating in a form-fit manner.

### Claim 27

A rotor for an electric rotating machine, said rotor comprising:
a shaft body; and
a squirrel cage formed by a coating made of a first metallic material and a second metallic material, which is different from the first metallic material, and applied onto at least part of a substantially cylindrical outer surface of the shaft body.

### Claim 28 (depends on 27)

The rotor of claim 27, wherein the rotor is configured for operation with a rotational speed of at least 5,000 rpm.

### Claim 29 (depends on 27)

The rotor of claim 27, wherein the second metallic material is a soft-magnetic material.

### Claim 30 (depends on 29)

The rotor of claim 29, wherein the shaft body is made from the second metallic material, said at least part of the squirrel cage being formed by the first metallic material.

### Claim 31 (depends on 30)

The rotor of claim 30, wherein the first metallic material has a conductivity of more than 40 MS/m.

### Claim 32 (depends on 27)

The rotor of claim 27, wherein the coating includes a third material to insulate the first and second metallic materials from one another.

### Claim 33 (depends on 32)

The rotor of claim 32, wherein at least two of the first and second metallic materials and the third material of the coating are connected in a form-fit manner.

### Claim 34

An electric rotating machine, comprising a rotor, said rotor comprising a shaft body, and a squirrel cage formed by a coating made of a first metallic material and a second metallic material, which is different from the first metallic material, and applied onto at least part of a substantially cylindrical outer surface of the shaft body.