# US 10,770,956 B2 · Electric machine

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- Number: US 10,770,956 B2
- Document ID: US10770956B2
- Status: Granted
- Kind: B2
- Application number: 15/525,551
- Filed: 2015-09-11
- Published: 2017-11-16
- Granted: 2020-09-08
- Earliest claimed: 2014-11-13
- Assignees: Robert Bosch GmbH
- Applicants: Robert Bosch GmbH
- Inventors: Marcus Alexander; Arndt Kelleter; Miguel Ruiz De Larramendi; Patrick Heuser; Mercedes Herranz Gracia
- Web page: https://patentgrep.com/patent/US10770956B2

## CPC

- H02K 1/165: {Shape, form or location of the slots}
- H02K 1/265: {Shape, form or location of the slots}
- H02K 17/12: for multi-phase current
- H02K 17/16: having rotors with internally short-circuited windings, e.g. cage rotors
- H02K 17/20: having deep-bar rotors
- H02K 1/146: {consisting of a generally annular yoke with salient poles}
- H02K 1/16: Stator cores with slots for windings
- H02K 1/26: Rotor cores with slots for windings
- H02K 3/12: arranged in slots
- H02K 15/085: by laying conductors into slotted stators
- H02K 2213/03: Machines characterised by numerical values, ranges, mathematical expressions or similar information
- H02K: DYNAMO-ELECTRIC MACHINES (dynamo-electric relays H01H53/00; conversion of DC or AC input power into surge output power {H03K3/53})

## Abstract

The invention relates to an electric asynchronous machine (1), in particular an induction machine, comprising: —a cylindrical stator (2) with stator teeth (22) on a stator yoke (21), wherein a ratio between a yoke height (hy1) of the stator yoke (21) in the radial direction and a groove height (hn1) of the stator grooves (23) in the radial direction ranges from 1.75 to 2.5; —a cylindrical rotor (4) with poles (42) on a rotor yoke which are defined by short-circuit windings in a rotor body (41), wherein a ratio between the yoke height of the rotor body (41) in the radial direction and the groove height of the rotor grooves in the radial direction ranges from 2 to 2.75.

## Claims

### Claim 1

An electric asynchronous machine (1), comprising:
a cylindrical stator (2) having stator teeth (22) that are arranged on a stator yoke (21); and
a cylindrical rotor (4) having rotor poles (42) that are arranged on a rotor yoke, said rotor poles being defined by short-circuit windings in a rotor body (41), wherein a ratio of a yoke height (hy1) of the stator yoke (21) in a radial direction with respect to a slot height (hn1) of stator slots (23) in the radial direction is between 1.75 and 2.5, and wherein a ratio of the yoke height of the rotor body (41) in the radial direction with respect to the slot height of the rotor slots in the radial direction is between 2 and 2.75.

### Claim 2 (depends on 1)

The asynchronous machine (1) as claimed in claim 1, wherein a ratio of slot widths (nb1) of a region of the stator slots (23) that is adjacent to a tooth tip of the stator slot (23) with respect to a slot width (nb2) at a slot base is between 0.9 and 1.1.

### Claim 3 (depends on 1)

The asynchronous machine (1) as claimed in claim 1, wherein the asynchronous machine is a three-phase machine.

### Claim 4 (depends on 3)

The asynchronous machine (1) as claimed in claim 3, wherein the asynchronous machine comprises multiple three-phase systems that are offset with respect to one another by 0° or 30°.

### Claim 5 (depends on 1)

The asynchronous machine (1) as claimed in claim 1, wherein the short-circuit windings are produced from aluminum, copper or a material having an even higher magnitude of conductivity.

### Claim 6 (depends on 1)

The asynchronous machine (1) as claimed in claim 1, wherein the rotor body (21) is cooled by a flushing procedure using a cooling agent.

### Claim 7 (depends on 1)

The asynchronous machine (1) as claimed in claim 1, wherein the rotor body (21) is cooled by a flushing procedure using oil or air.