摘要 |
PURPOSE: A speed control apparatus for induction motor is provided to achieve an optimized response of system by varying the proportional gain and integral gain in accordance with the speed error. CONSTITUTION: A speed control apparatus comprises a subtracter(211) for calculating a speed error(Werr) by subtracting a feedback speed(W) from a speed command(W'); a proportional controller(212) for compensating output of the subtracter with the proportional gain; an integral controller(213) for compensating output of the subtracter with the integral gain; an adder(214) for adding the output of the proportional controller and the output of the integral controller, and generating a torque command(Tr); a speed control unit(215) for outputting the speed command to an induction motor by performing an arithmetic operation to the output of the adder; and a gain converting unit(216) for varying the gain of the proportional controller and the integral controller in accordance with the output of the subtracter.
|