Rotor, Method for Producing a Rotor, Asynchronous Machine, and Vehicle

• US 20180287472A1
• Filed: 06/06/2018
• Published: 10/04/2018
• Est. Priority Date: 12/08/2015
• Status: Active Grant

• Current Assignee: Bayerische Motoren Werke AG
• Original Assignee: Bayerische Motoren Werke AG
• Inventors: LICHTINGER, Josef, ULBRICH, Holger, SIEGLING, Manfred
• Granted Patent: US 10,461,616 B2
• Time in Patent Office: Days
• CPC Class Codes: H02K 15/0012 Manufacturing cage rotors
• CPC Class Codes: H02K 17/165 characterised by the squirrel-cage or other short-circuited windings
• CPC Class Codes: H02K 17/20 having deep-bar rotors

Abstract

A rotor for an asynchronous machine has a laminated core and a short-circuit cage at least partially integrated in the laminated core. The short-circuit cage is designed with rods having or consisting of a first electrically conductive material and short-circuit rings having or consisting of a second electrically conductive material. At least one of the short-circuit rings is designed with a support ring, and each support ring is designed as a structure interlockingly and/or integrally cast onto or into the associated short-circuit ring.

Claims

1. A rotor for an asynchronous machine, comprising:

a laminated core; and

a short-circuit cage which is at least partially integrated into the laminated core, wherein

the short-circuit cage comprises

rods made with or from a first electrically conductive material,

short-circuit rings made with or from a second electrically conductive material,

wherein at least one of the short-circuit rings is constructed with a support ring, and

wherein a respective support ring is constructed as a structure which is cast onto or into the respective short-circuit ring in at least one of a positively locking or materially joining fashion.

2. The rotor as claimed in claim 1, wherein

the respective support ring is constructed entirely or partially on an outer circumference on the respective short-circuit ring and/or is entirely or partially embedded in the respective short-circuit ring.

3. The rotor as claimed in claim 1, wherein

a respective support ring is constructed with, on a surface, a contour for supporting the positive locking and/or the material joining with the respective short-circuit ring.

4. The rotor as claimed in claim 3, wherein

the contour has one or more recesses and/or one or more projections.

5. The rotor as claimed in claim 1, wherein

a respective support ring is constructed:

(a) with or from a material from a group of materials comprising metallic materials, ceramic materials and composites, and/or

(b) with or from a same material as the respective short-circuit ring.

6. The rotor as claimed in claim 5, wherein

the materials comprise glass materials and/or carbon fiber materials.

7. The rotor as claimed in claim 1, wherein at least one of the following:

(a) the rods are constructed in or with a cast and/or joined structure,

(b) one or more of the short-circuit rings are constructed as end rings,

(c) the first material has a higher electrical conductivity than the second material,

(d) the second material has a greater mechanical strength and/or stability than the first material, or

(e) the first material and/or the second material is a material from a group comprising aluminum, copper, silver and the combinations and alloys thereof, and wherein the first material is or has copper or a copper alloy, and the second material is or has aluminum or an aluminum alloy.

11. The method as claimed in claim 4, wherein

the contour has one or more recesses and/or one or more projections.

16. An asynchronous machine for a drive and/or a generator of a vehicle, comprising:

a stator; and

a rotor as claimed in claim 1.

17. A vehicle, comprising:

an asynchronous machine constructed as part of a drive and/or a generator of the vehicle, wherein

the asynchronous machine comprises a rotor as claimed in claim 1.

18. The vehicle as claimed in claim 17, wherein the vehicle is a passenger car, a battery-powered electric vehicle and/or a hybrid vehicle.

8. A method for producing a rotor for an asynchronous machine having a laminated core and a short-circuit cage which is at least partially integrated into the laminated core, the method comprising the acts of:

constructing the short circuit cage with rods made with or from a first electrically conductive material and short-circuit rings made with or from a second electrically conductive material, wherein

at least one of the short-circuit rings is constructed with a support ring, and

a respective support ring is cast onto or into the respective short-circuit ring in a positively locking and/or materially joined fashion.

9. The method as claimed in claim 8, wherein

a respective support ring is constructed entirely or partially on an outer circumference of the respective short-circuit ring and/or is entirely or partially embedded in the respective short-circuit ring.

10. The method as claimed in claim 8, wherein

a respective support ring is constructed with, on a surface, a contour for supporting the positive locking and/or the material joining with the respective short-circuit ring.

12. The method as claimed in claim 8, wherein

a respective support ring is constructed:

(a) with or from a material from a group of materials comprising metallic materials, alloys, ceramic materials and composites, and/or

(b) with or from a same material as the respective short-circuit ring.

13. The method as claimed in claim 12, wherein

the materials comprise glass materials and/or carbon fiber materials.

14. The method as claimed in claim 8, wherein

(a) the rods are constructed in or with a cast and/or joined structure,

(b) one or more of the short-circuit rings are constructed as end rings,

(c) a material with a higher electrical conductivity than that of the second material is used as the first material,

(d) a material with greater mechanical strength and/or stability than that of the first material is used as the second material, or

(e) a material from a group which comprising aluminum, copper, silver and combinations and alloys thereof is used as the first material and/or as the second material, and wherein the first material is or has copper or a copper alloy, and the second material is or has aluminum or an aluminum alloy.

15. The method as claimed in claim 8, wherein

a respective short-circuit ring is constructed by a casting process using a mold, and

in the process, a support ring or a preform of the support ring of the short-circuit ring is previously positioned in the mold and in this manner is simultaneously cast on or in during the casting of the short-circuit ring.