IP Library › Granted Patent US 7,095,153
Granted Patent B1
US 7,095,153 · App. 11/084,889 · Granted Aug 22, 2006

Extended core for motor/generator

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Quick Facts
Patent No.
US 7,095,153
App. No.
11/084,889
Granted
Aug 22, 2006
Kind
B1
Abstract

An extended stator core in a motor/generator can be utilized to mitigate losses in end regions of the core and a frame of the motor/generator. To mitigate the losses, the stator core can be extended to a length substantially equivalent to or greater than a length of a magnetically active portion in the rotor. Alternatively, a conventional length stator core can be utilized with a shortened magnetically active portion to mitigate losses in the motor/generator. To mitigate the losses in the core caused by stator winding, the core can be extended to a length substantially equivalent or greater than a length of stator winding.

Claims (18)

1. A motor/generator comprising:

a rotor having a magnetic ally active portion;

a stator winding that interacts with the rotor to facilitate rotation of the rotor; and

a stator core coupled to the stator winding, the magnetically active portion of the rotor is longer than the stator core by a length from about zero to about fifty percent an inner radius of the stator core.

2. The motor/generator of claim 1 , the magnetically active portion of the rotor is a high temperature superconductor (HTS) winding.

3. The motor/generator of claim 1 , the magnetically active portion of the rotor includes a superconducting winding.

4. The motor/generator of claim 1 , the magnetically active portion of the rotor includes at least one permanent magnet and ferromagnetic material.

5. The motor/generator of claim 1 , the length of the magnetically active portion is a function of balancing a loss in torque versus an efficiency of the motor/generator.

6. The motor/generator of claim 1 , the length of the magnetically active portion is between about zero to about forty percent the length of an inner radius of the stator core.

7. The motor/generator of claim 1 , the length of the magnetically active portion is between about zero to about thirty percent the length of an inner radius of the stator core.

8. The motor/generator of claim 1 , the length of the magnetically active portion is between about zero to about twenty percent the length of an inner radius of the stator core.

9. The motor/generator of claim 1 , the length of the magnetically active portion is between about zero to about ten percent the length of an inner radius of the stator core.

10. The motor/generator of claim 1 is a permanent magnet machine.

11. The motor/generator of claim 1 is a superconducting synchronous motor/generator.

12. A superconducting synchronous motor/generator comprising:

a rotor having a superconducting winding; and

a stator core;

the superconducting winding is longer than the stator core by a length ranging from near zero to about fifty percent of an inner radius of the stator core.