Patent ID: 6359415
Filing Date: 2002-03-19
Classification: H02P,Y02P

Abstract:
A synchronous motor controller for driving a synchronous motor at variable speed with a power converter, comprising:speed control means for calculating an active current reference value based on a deviation of a speed sensed value of said synchronous motor from a speed reference value of said synchronous motor; three-phase PQ conversion means for calculating an active current value and a reactive current value based on a three-phase current sensed value, or an armature current of said synchronous motor, and a voltage phase reference value; active current control means for calculating a voltage phase compensating value based on a deviation of the active current value calculated by said three-phase PQ conversion means and the active current reference value calculated by said speed control means; voltage phase computing means for calculating the voltage phase reference value based on the voltage phase compensating value calculated by said active power control means and a magnetic pole position sensed value of said synchronous motor; and polar-coordinate three-phase conversion means for calculating a three-phase voltage reference value based on the voltage phase reference value calculated by said voltage phase computing means and a voltage amplitude reference value.