Patent ID: 6750628
Filing Date: 2004-06-15
Classification: H02K,H02P

Abstract:
A permanent magnet machine control arrangement comprising:a stator having a plurality of windings; a rotor disposed for rotation within the stator having a plurality of pole pieces and a plurality of permanent magnets disposed between the pole pieces to generate magnetic flux extending from the pole pieces to intercept the windings in the stator during rotation of the rotor; a plurality of magnetic shunts disposed between adjacent pole pieces, each shunt having a winding to generate flux in the shunt in proportion to the current supplied to the winding to thereby reduce flux shunted through the shunt from adjacent pole pieces and increase flux extending from the pole pieces to intercept windings in the stator; and a control unit for comparing the instantaneous output of the machine with a wave form representing a desired instantaneous output and generating a difference signal to control the instantaneous energization of the windings in the flux shunts in the rotor and thereby control the wave shape of the output from the machine to conform to a desired wave shape.