Patent ID: 8148866
Filing Date: 2012-04-03
Classification: H02K

Abstract:
1. A permanent magnet generator comprising: a stator including stator field coils, said stator being connected to supply an output voltage to an output; a permanent magnet rotor positioned to rotate relative to said stator, said permanent magnet rotor having a plurality of pole pieces, with said plurality of pole pieces being provided with permanent magnets; and a separate control coil associated with each of said plurality of pole pieces and a control for supplying current through said control coils to change the output voltage supplied to the output; said output voltage supplied to the output being sensed and compared to a desired set point, and the current flow through the control coils being controlled in response to said comparison; a first switching position being selected to control the current flow through the control coils if the sensed voltage is higher than the desired set point, and a second switching position being selected should the sensed voltage be lower than the desired set point, and said first switching position including closing a first switch and opening a second switch, and said second switching position including opening said first switch, and closing said second switch.