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Flywheel power supply having axial magnetic bearing for frictionless rotation

  • US 6,262,505 B1
  • Filed: 03/26/1997
  • Issued: 07/17/2001
  • Est. Priority Date: 03/26/1997
  • Status: Expired due to Term
First Claim
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1. A power supply device for providing uninterrupted power for a period of time,the power supply device comprising a controller and a flywheel device, the flywheel device comprising a housing containing a flywheel rotor and a motor/generator comprising a motor/generator rotor, the flywheel rotor and the motor/generator rotor being mounted on a common shaft, an active axial magnetic bearing comprising a coil surrounding the shaft and being located adjacent to the motor/generator rotor for frictionless rotation, the bearing providing support for the shaft, the flywheel rotor and motor/generator rotor, the axial magnetic bearing being attached to the housing and providing, in combination with the motor/generator rotor, a flux path and magnetic field tending to lift the motor/generator rotor and the shaft on which it is mounted, wherein a single flux path extends through the motor/generator rotor and axial magnetic bearing providing the magnetic field tending to lift the motor/generator rotor and the shaft on which it is mounted.

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