# US 11,114,924 B2 · Squirrel-cage rotor for an asynchronous machine

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- Number: US 11,114,924 B2
- Document ID: US11114924B2
- Status: Granted
- Kind: B2
- Application number: 16/327,479
- Filed: 2017-08-01
- Published: 2019-06-13
- Granted: 2021-09-07
- Earliest claimed: 2016-08-25
- Assignees: Vitesco Technologies GmbH
- Applicants: CPT Group GmbH
- Inventors: Holger Fröhlich; Isao Fukumoto
- Web page: https://patentgrep.com/patent/US11114924B2

## CPC

- H02K 1/30: using intermediate parts, e.g. spiders
- H02K 1/16: Stator cores with slots for windings
- H02K 1/26: Rotor cores with slots for windings
- H02K 1/32: with channels or ducts for flow of cooling medium
- H02K 3/12: arranged in slots
- H02K 3/48: in slots
- H02K 7/003: {Couplings; Details of shafts (means for mounting rotors on shafts H02K1/28)}
- H02K 9/19: for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil
- H02K 15/023: Cage rotors
- H02K 15/028: Fastening stator or rotor bodies to casings, supports, shafts or hubs
- H02K 17/20: having deep-bar rotors
- H02K: DYNAMO-ELECTRIC MACHINES (dynamo-electric relays H01H53/00; conversion of DC or AC input power into surge output power {H03K3/53})

## Abstract

Various embodiments include a squirrel-cage rotor for an asynchronous machine comprising: a first shaft journal; a second shaft journal; a laminated rotor core; and a filler body cast onto the laminated rotor core connecting the filler body and the laminated rotor core in a rotationally fixed manner. The filler body is connected to the shaft journals in a rotationally fixed manner and a torque applied to the shaft journals is transmitted to the laminated rotor core.

## Claims

### Claim 1

A squirrel-cage rotor for an asynchronous machine, the squirrel-cage rotor comprising:
a first shaft journal comprising a first shaft journal bearing surface;
a second shaft journal comprising a second shaft journal bearing surface;
a laminated rotor core; and
a filler body cast onto the laminated rotor core connecting the filler body and the laminated rotor core in a rotationally fixed manner;
wherein the filler body is connected to the shaft journal bearing surfaces in a rotationally fixed manner and a torque applied to the shaft journals is transmitted to the laminated rotor core;
wherein the filler body comprises three spokes extending in a radial direction;
each of the three spokes includes two respective threaded bores at opposing ends; and
the first shaft journal bearing surface is attached to the laminated rotor core by three screws fastened into the threaded bores of the three spokes at a first end of the laminated rotor core and the second shaft journal bearing surface is attached to the laminated rotor core by three screws fastened into the threaded bores of the three spokes at a second end of the laminated rotor core.

### Claim 2 (depends on 1)

The squirrel-cage rotor as claimed in claim 1, wherein:
the first shaft journal bearing surface includes a first axial bore;
the second shaft journal bearing surface includes a second axial bore;
the filler body includes a third axial bore;
the third axial bore connects the first axial bore to the second axial bore; and
the first bore, the second bore, and the third bore form a cooling duct running through the first shaft journal, the filler body, and the second shaft journal.

### Claim 3 (depends on 2)

The squirrel-cage rotor as claimed in claim 2, further comprising:
a first short-circuiting ring; and
a second short-circuiting ring;
wherein the first shaft journal includes a first radial bore; and
the second shaft journal includes a second radial bore;
the first radial bore is connected to the first axial bore;
the second radial bore is connected to the second axial bore;
the first short-circuiting ring radially surrounds the first radial bore;
the second short-circuiting ring radially surrounds the second radial bore; and
rotation of the shaft journals drive a cooling medium out of the radial bores radially to the outside in the direction of the short-circuiting rings and can cool the short-circuiting rings.

### Claim 4 (depends on 1)

The squirrel-cage rotor as claimed in claim 1, wherein the laminated rotor core is connected to the filler body in an interlocking and force-fitting manner in the axial direction.

### Claim 5 (depends on 1)

The squirrel-cage rotor as claimed in claim 1, wherein the shaft journal bearing surfaces each includes an attachment arranged on the end side for centering purposes.

### Claim 6 (depends on 1)

The squirrel-cage rotor as claimed in claim 1, wherein the shaft journal bearing surfaces each include an end plate including three through holes for fastening the screws to the filler body.

### Claim 7

An asynchronous machine comprising:
a stator;
a first stator end winding;
a second stator end winding; and
a squirrel-cage rotor comprising:
a first shaft journal comprising a first shaft journal bearing surface;
a second shaft journal comprising a second shaft journal bearing surface;
a laminated rotor core; and
a filler body cast onto the laminated rotor core connecting the filler body and the laminated rotor core in a rotationally fixed manner;
wherein the filler body is connected to the shaft journals in a rotationally fixed manner and a torque applied to the shaft journals is transmitted to the laminated rotor core;
wherein the first stator end winding surrounds a first short-circuiting ring; and
the second stator end winding surrounds a second short-circuiting ring; and
rotation of the shaft journals drive a cooling medium out of radial bores radially to the outside in the direction of the stator end windings and can cool the stator end windings;
wherein the filler body comprises three spokes extending in a radial direction;
each of the three spokes includes two respective threaded bores at opposing ends; and
the first shaft journal bearing surface is attached to the laminated rotor core by three screws fastened into the threaded bores of the three spokes at a first end of the laminated rotor core and the second shaft journal bearing surface is attached to the laminated rotor core by three screws fastened into the threaded bores of the three spokes at a second end of the laminated rotor core.