Rotor, electric motor, method for producing a rotor and use of a rotor and electric motor

Patent metadata

Field	Value
Publication number	US-12068638-B2
Application number	US-201917261225-A
Country	US
Kind code	B2
Filing date	Jul 19, 2019
Priority date	Jul 25, 2018
Publication date	Aug 20, 2024
Grant date	Aug 20, 2024

Abstract

A rotor and a method of making such a rotor, wherein the rotor has a shaft, a longitudinal axis, and a rotor packet connected to the shaft at least in torsion-resistant manner. The rotor packet is assembled from individual sheet lamellae, wherein the rotor packet has an opening for receiving the shaft. The shaft is a hollow shaft with a wall, wherein the wall of the shaft has, on its side facing toward the opening, recesses extending in the longitudinal direction. An electric motor, in particular a synchronous or hybrid synchronous machine, including a rotor and a stator, has such a rotor. The recesses are produced by cutting methods, in particular milling, or reshaping methods, in particular pressing.

First claim

What is claimed is:

1. A rotor, comprising
a shaft with a longitudinal axis, and
a rotor packet connected to the shaft at least in a torsion-resistant manner,
wherein the rotor packet comprises individual sheet lamellae,
wherein the rotor packet comprises an opening sized and shaped to receive the shaft,
wherein the shaft is a hollow shaft with a wall, wherein the wall of the shaft comprises, on its side facing toward the opening, recesses extending in the longitudinal direction, and wherein each of the recesses is an elongated hole through the wall of the shaft, wherein the elongated hole penetrates radially through the wall of the shaft from an outermost wall to an innermost wall.

2. The rotor of claim 1 wherein the recesses are oriented parallel to the longitudinal axis of the shaft and/or parallel to one another.

3. The rotor of claim 1 wherein the shaft comprises contact faces that lie against the inner surface of the opening, individual ones of the recesses being arranged between respective contact faces.

4. The rotor of claim 1 wherein the shaft is formed from a magnetically soft material.

5. The rotor of claim 1 wherein the rotor packet exhibits cutouts which directly adjoin the recesses so that the recesses and cutouts jointly form a contiguous flux barrier in each instance.

6. An electric motor comprising a rotor and a stator, wherein the rotor comprises a shaft with a longitudinal axis and a rotor packet connected to the shaft at least in a torsion-resistant manner, wherein the rotor packet comprises individual sheet lamellae, wherein the rotor packet comprises an opening sized and shaped to receive the shaft, and wherein the shaft is a hollow shaft with a wall, wherein the wall of the shaft comprises, on its side facing toward the opening, recesses extending in the longitudinal direction, wherein each of the recesses is an elongated hole through the wall of the shaft, wherein the elongated hole penetrates radially through the wall of the shaft from an outermost wall to an innermost wall.

7. A method for producing a rotor, the rotor comprising a shaft with a longitudinal axis and a rotor packet connected to the shaft at least in a torsion-resistant manner, wherein the rotor packet comprises individual sheet lamellae, wherein the rotor packet comprises an opening sized and shaped to receive the shaft, and wherein the shaft is a hollow shaft with a wall, wherein the wall of the shaft comprises, on its side facing toward the opening, recesses extending in the longitudinal direction, the method comprising:
producing the recesses by material-separating methods or reshaping methods wherein each of the recesses is an elongated hole through the wall of the shaft, wherein the elongated hole penetrates radially through the wall of the shaft from an outermost wall to an innermost wall.

Assignees

• Thyssenkrupp Ag

Inventors

• Schröder Mathias
• Buol Roland

Classifications

• H02K7/003 Primary

  Couplings; Details of shafts (means for mounting rotors on shafts H02K1/28) · CPC title

• H02K1/32

  with channels or ducts for flow of cooling medium · CPC title

• H02K1/2766

  having a flux concentration effect · CPC title

• H02K1/02

  characterised by the magnetic material · CPC title

• F16C2380/26

  Dynamo-electric machines or combinations therewith, e.g. electro-motors and generators · CPC title