Electric rotating machine with laterally magnetized magnets

Patent metadata

Field	Value
Publication number	US-2016294229-A1
Application number	US-201615087464-A
Country	US
Kind code	A1
Filing date	Mar 31, 2016
Priority date	Apr 1, 2015
Publication date	Oct 6, 2016
Grant date	—

Abstract

An electric rotating machine includes an outer stator, and an inner stator arranged inside the outer stator in concentric relationship to the outer stator. The inner stator has a plurality of permanent magnets which contain iron-neodymium-boron. A rotor is arranged in concentric relationship to the outer stator and the inner stator between the outer stator and the inner stator. The rotor is configured for movement in relation to the outer stator and the inner stator and defines with the inner stator an internal air gap there between. Each permanent magnet of the inner stator has a north pole and a south pole on a side facing the internal air gap.

First claim

What is claimed as new and desired to be protected by Letters Patent is set forth in the appended claims and includes equivalents of the elements recited therein:

1 . An electric rotating machine, comprising:
an outer stator; an inner stator arranged inside the outer stator in concentric relationship to the outer stator, said inner stator having a plurality of permanent magnets which contain iron-neodymium-boron; and a rotor arranged in concentric relationship to the outer stator and the inner stator between the outer stator and the inner stator, said rotor being configured for movement in relation to the outer stator and the inner stator and defining with the inner stator an internal air gap there between, with each permanent magnet of the inner stator having a north pole and a south pole on a side facing the internal air gap.

2 . The electric rotating machine of claim 1 , wherein the outer stator has a plurality of windings.

3 . The electric rotating machine of claim 1 , wherein the inner stator has a laminated core which is made from a light metal.

4 . The electric rotating machine of claim 3 , wherein the light metal is aluminum.

5 . The electric rotating machine of claim 3 , wherein the permanent magnets are directly connected to the laminated core of the inner stator.

6 . The electric rotating machine of claim 1 , wherein the permanent magnets of the inner stator are arranged substantially without a gap in a peripheral direction and substantially cover a surface of the inner stator facing the internal air gap.

7 . The electric rotating machine of claim 1 , wherein the permanent magnets have a lenticular, trapezoidal or shell-shaped configuration.

8 . The electric rotating machine of claim 1 , wherein the permanent magnets have a section which faces away from the internal air gap and essentially follows a preferred magnetic direction.

9 . The electric rotating machine of claim 1 , wherein the rotor comprises a support element which is made of a non-magnetic material and has a plurality of recesses, each said recess receiving a magnetically soft segment.

10 . The electric rotating machine of claim 1 , wherein the permanent magnets of the inner stator are made from a ferrite.

11 . The electric rotating machine of claim 1 , further comprising a cooling device configured to cool the permanent magnets of the inner stator.

12 . The electric rotating machine of claim 1 , further comprising a cooling device configured to cool the outer stator.

13 . The electric rotating machine of claim 1 , further comprising a first cooling device configured to cool the permanent magnets of the inner stator, and a second cooling device configured to cool the outer stator, at least one of the first and second cooling devices having a plurality of cooling pipes through which a coolant flows.

14 . A wind turbine, comprising a generator, said generator including an electric rotating machine comprising an outer stator, an inner stator arranged inside the outer stator in concentric relationship to the outer stator, said inner stator having a plurality of permanent magnets which contain iron-neodymium-boron, and a rotor arranged in concentric relationship to the outer stator and the inner stator between the outer stator and the inner stator, said rotor being configured for movement in relation to the outer stator and the inner stator and defining with the inner stator an internal air gap there between, with each permanent magnet of the inner stator having a north pole and a south pole on a side facing the internal air gap.

15 . A drive for an electrically driven aircraft or an electrically driven vehicle ( 28 ) or an electric traction vehicle, said drive comprising an electric rotating machine comprising an outer stator, an inner stator arranged inside the outer stator in concentric relationship to the outer stator, said inner stator having a plurality of permanent magnets which contain iron-neodymium-boron, and a rotor arranged in concentric relationship to the outer stator and the inner stator between the outer stator and the inner stator, said rotor being configured for movement in relation to the outer stator and the inner stator and defining with the inner stator an internal air gap there between, with each permanent magnet of the inner stator having a north pole and a south pole on a side facing the internal air gap.

Assignees

• Siemens Ag

Inventors

• Volkmuth Benjamin
• Vollmer Rolf

Classifications

• H02K9/197

  in which the rotor or stator space is fluid-tight, e.g. to provide for different cooling media for rotor and stator · CPC title

• H02K3/28

  Layout of windings or of connections between windings (windings for pole-changing H02K17/06, H02K17/14, H02K19/12, H02K19/32) · CPC title

• H02K5/20

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

• B60K1/00

  Arrangement or mounting of electrical propulsion units (B60K7/00 takes precedence; arrangement or mounting of plural diverse prime-movers for mutual or common propulsion B60K6/00) · CPC title

• H02K1/20

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