Star disk for an electric machine

Patent metadata

Field	Value
Publication number	US-9742235-B2
Application number	US-201615235178-A
Country	US
Kind code	B2
Filing date	Aug 12, 2016
Priority date	Apr 3, 2014
Publication date	Aug 22, 2017
Grant date	Aug 22, 2017

Abstract

A rotor element or a star disk which is designed to be arranged on an electrically excited rotor of an electric machine, includes a base which is designed to be arranged in an insert between the axial end of a laminate stack of the rotor and at least one end winding of the rotor. At least one fin is fastened on the base and is designed to protrude in the insert through the at least one end winding axially out of the at least one end winding.

First claim

What is claimed is:

1. A rotor element arrangeable on an electrically-excited rotor of an electric machine, comprising:
a base configured to be arranged in an insert between an axial end of a laminate stack of the rotor and at least one end winding of the rotor; and
at least one fin, which is integral with the base and is configured to protrude in the insert's axial direction through the at least one end winding axially out of the at least one end winding; and
a stator fin arrangement comprising at least two stator fins, one fin on the rotor element projecting between the at least two stator fins.

2. The rotor element according to claim 1 , wherein, on an outer radial area of the rotor element, an end element is arranged, which extends axially into the insert, and is designed to be arranged in the insert radially outwards from the end winding.

3. The rotor element according to claim 1 , wherein the fin projects beyond the end winding by at least 50% of the thickness of the end winding.

4. The rotor element according to claim 1 , wherein the fin projects beyond the end winding by at least 100% of the thickness of the end winding.

5. The rotor element according to claim 1 , wherein the fin projects beyond the end winding by at least 150% of the thickness of the end winding.

6. The rotor element according to claim 1 , wherein the fin projects beyond the end winding by at least 200% of the thickness of the end winding.

7. The rotor element according to claim 1 , wherein, on a side facing the end winding, the rotor element is configured convexly.

8. The rotor element according to claim 1 , wherein, on a side facing the laminate stack, the rotor element is configured for electrical isolation.

9. The rotor element according to claim 1 , wherein the rotor element is formed of metal, aluminum and/or of a plastic material.

10. An electric machine, comprising:
a stator;
a rotor, which is arranged within the stator, the rotor having a rotor winding;
at least one rotor element arranged at an axial end of the rotor, the rotor element comprising a base configured to be arranged in an insert between an axial end of a laminate stack of the rotor and at least one end winding of the rotor, and at least one fin, which is integral with the base and is configured to protrude in the insert's axial direction through the at least one end winding axially out of the at least one end winding; and
a stator fin arrangement comprising of at least two stator fins, one fin on the rotor element projecting between the at least two stator fins, wherein
the at least one end winding of the rotor winding is arranged above the base of the rotor element.

11. The electric machine according to claim 10 , wherein the stator fin is configured in a fixed arrangement in relation to the stator and is adjacent to the fin on the rotor element.

12. A rotor element arrangeable on an electrically-excited rotor of an electric machine, comprising:
a base configured to be arranged in an insert between an axial end of a laminate stack of the rotor and at least one end winding of the rotor; and
at least one fin, which is integral with the base and is configured to protrude in the insert's axial direction through the at least one end winding axially out of the at least one end winding; and
a stator, wherein
a stator fin is configured in a fixed arrangement in relation to the stator and is adjacent to the at least one fin, and
the stator fin projects between two fins on the rotor element and/or between one fin on the rotor element and an end element of the rotor element.

Assignees

• Bayerische Motoren Werke Ag

Inventors

• Huber Andreas
• Sousek Jan
• Barti Endre
• Schinnerl Berthold
• Duricic Dragoljub
• Britten Gerd
• Mintzlaff Johannes
• Maier Alexander
• Mayr Andreas

Classifications

• H02K5/20

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

• H02K9/08

  by gaseous cooling medium circulating wholly within the machine casing (H02K9/10 takes precedence) · CPC title

• H02K9/22

  by solid heat conducting material embedded in, or arranged in contact with, the stator or rotor, e.g. heat bridges · CPC title

• H02K5/1672

  radially supporting the rotary shaft at both ends of the rotor (H02K5/1677 takes precedence) · CPC title

• H02K3/38

  around winding heads, equalising connectors, or connections thereto · CPC title