CONTROLLER FOR WOUND ROTOR INDUCTION MOTOR

摘要

PROBLEM TO BE SOLVED: To provide a controller for a wound inductive motor capable of attaining an excellent conversion ratio and restricting current ripple with a relatively simple structure.

SOLUTION: This controller is constituted of a first voltage converter 3 connected with a secondary winding of the wound inductive motor; a capacitor for smoothing a DC output; a second voltage type converter 5 for regenerating a DC output to an AC power supply; a speed detector for detecting a motor speed; a detector for detecting a secondary current of the wound inductive motor; a detector for detecting DC voltage applied to the capacitor; a speed controller for generating the secondary current reference by controlling the speed by the speed detector; a controller for controlling a current by the secondary current reference and performing PWM control of the first voltage type converter by the output; and a second PWM controller for performing the PWM control of the secondary voltage type converter, so that the output of the DC voltage detector may become a prescribed value. The first PWM controller adjusts the ON/OFF ratio of three-phase shorting of the first voltage type converter.

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