Rotor rim for an electric machine

Patent metadata

Field	Value
Publication number	US-12483080-B2
Application number	US-202318334656-A
Country	US
Kind code	B2
Filing date	Jun 14, 2023
Priority date	Dec 14, 2020
Publication date	Nov 25, 2025
Grant date	Nov 25, 2025

Abstract

A rotor rim for an electric machine, having at least two solid annular plates and axially oriented tension bolts connecting the annular plates with each other, wherein on the outer circumference of annular plates grooves are arranged for accommodating rotor poles, for each rotor pole at least two tension bolts are provided, between each two adjacent annular plates a layer of intermediate ring elements is arranged, each layer includes exactly one intermediate ring element per rotor pole, intermediate ring elements are arranged such that between each two adjacent intermediate ring elements a ventilation duct is formed which extends from the inside of the rotor rim to the outer circumference of the rotor rim where it opens into space between the rotor poles, and each intermediate ring element is penetrated by at least two tension bolts and only abuts with a part of its axially oriented surface against adjacent annular plates.

First claim

What is claimed is:

1 . A rotor rim for an electric machine, the rotor rim comprising:
a plurality of tension bolts which are axially oriented; at least two annular plates which are solid, two of the at least two annular plates being arranged in an axial direction on an outside so as to form two outer annular plates, which are configured such that any given number of other ones of the annular plates are arranged between the outer annular plates, the plurality of tension bolts connecting the at least two annular plates to one another, the at least two annular plates including an outer circumference which includes a plurality of grooves arranged thereon, the plurality of grooves being configured for accommodating a plurality of rotor poles which are configured such that for each one of the plurality of rotor poles at least two of the plurality of tension bolts are provided; a plurality of intermediate ring elements, between each two adjacent ones of the at least two annular plates respectively a layer of the plurality of intermediate ring elements being arranged, each layer of the plurality of intermediate ring elements being configured for including exactly one of the plurality of intermediate ring elements per one of the plurality of rotor poles, the plurality of intermediate ring elements being arranged in such a way that between each two adjacent ones of the plurality of intermediate ring elements a ventilation duct is formed which extends from an inside of the rotor rim to an outer circumference of the rotor rim where the ventilation duct opens into a space between the plurality of rotor poles, each of the plurality of intermediate ring elements being penetrated by at least two of the plurality of tension bolts and including an axially oriented surface which includes an abutting part and a remaining part, each of the plurality of intermediate ring elements abutting with only the abutting part of the axially oriented surface against an adjacent one of the at least two annular plates respectively, the abutting part of the axially oriented surface being configured in each case to be raised with respect to the remaining part of the axially oriented surface of a respective one of the plurality of intermediate ring elements.

2 . The rotor rim according to claim 1 , wherein at least a part of the at least two annular plates has a plurality of ventilation holes which extend from an interior of the rotor rim to the outer circumference of the rotor rim where in each case the plurality of ventilation holes open into the space located between the plurality of rotor poles.

3 . The rotor rim according to claim 1 , wherein the plurality of intermediate ring elements each has a shape of a ring-shaped segment and has a recess on an outer contour in a region of the plurality of grooves configured for accommodation of the plurality of rotor poles, and in the region the plurality of intermediate ring elements at least partially do not follow an outer contour of the at least two annular plates.

4 . The rotor rim according to claim 1 , wherein at least a part of the plurality of intermediate ring elements is configured such that the axially oriented surface of the plurality of intermediate ring elements respectively has a recess.

5 . The rotor rim according to claim 1 , wherein the at least two annular plates all have a same axial thickness.

6 . The rotor rim according to claim 1 , wherein the at least two annular plates have different axial thickness relative to one another.

7 . The rotor rim according to claim 1 , wherein the at least two annular plates further include a plurality of axially inner annular plates, wherein the outer annular plates have a greater axial thickness than the plurality of axially inner annular plates.

Assignees

• Voith Patent Gmbh

Inventors

• Steegmaier Jonas
• Ludwig Daniel

Classifications

• H02K7/102

  with friction brakes · CPC title

• H02K1/325

  between salient poles · CPC title

• H02K1/32

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

• H02K1/24

  Rotor cores with salient poles {; Variable reluctance rotors} · CPC title

• H02K1/28 Primary

  Means for mounting or fastening rotating magnetic parts on to, or to, the rotor structures · CPC title