Flux controlled PM electric machine rotor

Patent metadata

Field	Value
Publication number	US-9318937-B2
Application number	US-201313847578-A
Country	US
Kind code	B2
Filing date	Mar 20, 2013
Priority date	Mar 20, 2013
Publication date	Apr 19, 2016
Grant date	Apr 19, 2016

Abstract

A flux-regulated permanent magnet machine (PMM) includes a stationary portion and a rotating portion. The stationary portion includes a plurality of stator/armature windings. The rotating portion includes a plurality of permanent magnets and a control/field winding that is supplied with current to control the magnetic flux presented to the stator/armature windings.

First claim

The invention claimed is:

1. A permanent magnet machine comprising:
an excitation controller;
a wound field stator exciter configured to receive a control current from the excitation controller;
stator armature windings;
rotating exciter windings that develop an alternating current (AC) voltage in response to excitation provided by the wound field stator exciter;
a rotating rectifier that rectifies the AC voltage developed in the rotating exciter windings to a direct current (DC) voltage;
a control winding configured to receive winding current using the DC voltage; and
rotating permanent magnets embedded within a ferromagnetic yoke;
wherein the rotating permanent magnets are configured such that magnetic flux of the rotating permanent magnets flows through the ferromagnetic yoke and is only received by the stator armature windings when the winding current is received by the control winding;
wherein the control winding is configured to saturate the ferromagnetic yoke to direct the magnetic flux of the rotating permanent magnets to the stator armature windings when the control current is received by the control winding.

2. The permanent magnet machine of claim 1 , wherein the excitation controller is configured to increase the magnetic flux of the rotating permanent magnets presented to the stator armature windings by increasing the control current to increase the winding current through the control winding.

3. The permanent magnet machine of claim 1 , wherein the excitation controller is configured to decrease the magnetic flux of the rotating permanent magnets presented to the stator armature windings by decreasing the control current to decrease the winding current through the control winding.

4. The permanent magnet machine of claim 1 , wherein the control winding is configured to saturate the ferromagnetic yoke to direct the magnetic flux of the rotating permanent magnets to the stator armature windings when the winding current is received by the control winding.

5. A permanent magnet machine comprising:
a stator exciter that includes at least one exciter permanent magnet;
stator armature windings;
rotating exciter windings that are magnetically coupled to the at least one exciter permanent magnet;
a rotating rectifier that rectifies alternating current (AC) voltage developed in the rotating exciter windings to a direct current (DC) voltage;
a control winding configured to receive control current using the DC voltage; and
rotating permanent magnets embedded within a ferromagnetic yoke;
wherein the rotating permanent magnets are configured such that magnetic flux of the rotating permanent magnets flows through the ferromagnetic yoke and is only received by the stator armature windings when the control current is received by the control winding.

6. The permanent magnet machine of claim 5 , wherein the control winding is configured to saturate the ferromagnetic yoke to direct the magnetic flux of the rotating permanent magnets to the stator armature windings when the control current is received by the control winding.

7. A flux-regulated permanent magnet machine (PMM) comprising:
a stationary portion that includes stator armature windings and a stator exciter; and
a rotating portion comprising:
exciter armature windings magnetically coupled with the stator exciter;
a ferromagnetic yoke;
a plurality of permanent magnets embedded within the ferromagnetic yoke; and
a control winding configured to receive excitation current from the exciter armature windings;
wherein the plurality of permanent magnets are configured such that magnetic flux of the plurality of permanent magnets flows through the ferromagnetic yoke and is only received by the stator armature windings when the excitation current is received by the control winding.

8. The flux-regulated PMM of claim 7 , further comprising a controller configured to control the excitation current provided to the control winding, wherein the magnetic flux of the plurality of permanent magnets presented to the stator armature windings is increased by increasing the excitation current through the control winding.

9. The flux-regulated PMM of claim 7 , further comprising a controller configured to control the excitation current provided to the control winding, wherein the magnetic flux of the plurality of permanent magnets presented to the stator armature windings is decreased by decreasing the excitation current through the control winding.

10. The flux-regulated PMM of claim 7 , wherein the control winding is configured to saturate the ferromagnetic yoke to direct the magnetic flux of the plurality of permanent magnets to the stator armature windings when the excitation current is received by the control winding.

Assignees

• Hamilton Sundstrand Corp

Inventors

• Himmelmann Richard A

Classifications

• H02K21/042 Primary

  with permanent magnets and field winding both rotating · CPC title

• H02P25/28

  using magnetic devices with controllable degree of saturation, e.g. transductors · CPC title

• H02P2207/055

  Surface mounted magnet motors · CPC title

• H02P9/40

  by variation of reluctance of magnetic circuit of generator · CPC title

• H02P9/302

  Brushless excitation · CPC title