Method for Producing a Rotor for an Electrical Machine, in Particular of a Motor Vehicle, and Rotor and Motor Vehicle

• US 20200136483A1
• Filed: 12/26/2019
• Published: 04/30/2020
• Est. Priority Date: 06/27/2017
• Status: Active Grant

• Current Assignee: Bayerische Motoren Werke AG
• Original Assignee: Bayerische Motoren Werke AG
• Inventors: DURICIC, Dragoljub, RIENECKER, Thorsten, SCHLAG, Philipp, WINKLE, Daniel
• Granted Patent: US 11,342,824 B2
• Time in Patent Office: Days
• CPC Class Codes: B60K 6/26 characterised by the motors or the generators
• CPC Class Codes: H02K 1/22 Rotating parts of the magnetic circuit
• CPC Class Codes: H02K 15/02 of stator or rotor bodies
• CPC Class Codes: H02K 15/12 Impregnating, heating or drying of windings, stators, rotors or machines

Abstract

A method produces a rotor having at least one laminated core for an electrical machine, in which method at least one partial region of the rotor is provided with a plastic by injection molding. The method provides at least one disk following the laminated core in the axial direction of the rotor, by which disk the partial region is at least to a large extent delimited in the axial direction of the rotor; and by the injection molding, injects the plastic into the partial region via at least one through-opening in the disk leading into the partial region.

Claims

1. A method for producing a rotor having at least one laminated core for an electrical machine, in which method at least one partial region of the rotor is provided with a plastic by injection molding, the method comprising:

providing at least one disk which follows the laminated core in an axial direction of the rotor and by which the partial region is at least predominantly delimited in the axial direction of the rotor; and

by way of the injection molding, injecting the plastic into the partial region via at least one through opening in the disk leading into the partial region.

2. The method according to claim 1, wherein

at least one sealing element for sealing the partial region is arranged between the disk and the laminated core in the axial direction of the rotor.

3. The method according to claim 2, wherein

the sealing element is heated by heat which is output by the plastic when the plastic is injected into the partial region.

4. The method according to claim 3, wherein

the sealing element is at least partially deformed by the heat.

5. The method according to claim 2, wherein

the sealing element is at least partially deformed by an injection molding die used to carry out the injection molding.

6. The method according to claim 2, wherein

the sealing element is deformed by being pressed by the die.

7. The method according to claim 1, wherein

the plastic is injected into the partial region via a plurality of through openings in the disk leading into the partial region by the injection molding.

8. The method according to claim 1, wherein

the disk delimits over 75 percent of the partial region in the axial direction of the rotor.

9. The method according to claim 1, wherein

the disk forms a structural element of the rotor as produced.

10. A rotor for an electrical machine, comprising:

at least one laminated core;

at least one partial region in which the rotor is provided with a plastic by injection molding; and

at least one disk which follows the laminated core in an axial direction of the rotor, at least predominantly delimits the partial region in the axial direction of the rotor and has at least one through opening which leads into the partial region and via which the plastic is injected into the partial region by the injection molding.

11. A motor vehicle comprising at least one electrical machine having a rotor according to claim 10.