Patent ID: 6020712
Filing Date: 2000-02-01
Classification: H02K,H02P,Y02E

Abstract:
An AC machine, comprising a:an AC machine rotor with a layer of a re-magnetizable high coercive magnetic material provided thereon;an AC machine stator of a soft, low-loss magnetic material having a pole piece and an excitation coil on said pole piece;said stator and said rotor rotating relative to one another with a clearance enabling rotor magnetic poles to be selectively reformed on said layer of ret-magnetizable magnetic material by current energizing said excitation coil as said rotor rotates; anda control signal generator responsive to at least one input signal for generating pulses of programmed wave shapes which are selectively controlled in width, phase and magnitude as necessary to modify at least one of a location, length, and field intensity of said rotor poles for controlling an electrical characteristic of said AC machine.