Patent ID: 6771000
Filing Date: 2004-08-03
Classification: F01D,H02K

Abstract:
A power generation system, comprising:a compressor for compressing a medium comprising taken-in air and supplied fuel; a combustor for burning the medium compressed by said compressor; a turbine that is rotated by receiving the medium burned by said combustor; an electric rotaly machine mechanically connected to said turbine, said electric rotary machine including: a stator having a primary winding and a stator magnetic pole; a rotor having a field magnet facing said stator magnetic pole and a shaft; and a displacement mechanism provided on said rotor; a power converter electrically connected to said electric rotary machine; and a controller for controlling said power converter; wherein said field magnet comprises: a first field magnet with magnetic poles of sequentially different polarities arranged in a rotational direction; and a second field magnet rotatable with respect to said first field magnet, and having magnetic poles of sequentially different polarities arranged in a backward rotational direction; wherein said displacement mechanism displaces said second field magnet in an axial direction and in a rotational direction with respect to said first field magnet in accordance with a balance between a magnetic acting force between said first field magnet and said second field magnet, and a direction of torque generated in said rotor; wherein when said turbine is started, and said electric rotary machine is operated as an electric motor to elevate the speed of said turbine from zero to the self-sustaining speed of said turbine, the same magnetic pole centers of said first field magnet and said second field magnet are located in a line in accordance with the balance between the magnetic acting force between said first field magnet and said second field magnet, and the direction of rotating torque generated in said rotor; and wherein when said turbine operates at a speed in excess of the self-sustaining speed, and said electric rotary machine is operated as a generator to generate power, the direction of rotating torque generated in said rotor is reversed to thereby allow the same magnetic torque center positions of said first field magnet and said second field magnet to deviate from each other.