Patent ID: 6828744
Filing Date: 2004-12-07
Classification: H02P

Abstract:
A motor torque control apparatus comprising:a frequency-to-voltage converter for converting a command frequency to a voltage value according to a predetermined rated voltage-to-rated frequency ratio of a motor and outputting the voltage value; a magnetic flux controller for outputting a compensation voltage to compensate a difference between a predetermined reference value of a magnetic flux component current and a measured actual magnetic flux component current value; a stator voltage drop computing means for receiving the measured actual torque component current value, for computing a compensating voltage to compensate a voltage drop by the stator resistance of the motor and for outputting the compensating voltage; an adder for summing output values of the magnetic flux controller, of the frequency-to-voltage converter and of the stator voltage drop computing means and outputting the summed value as a torque component command voltage; a magnetic flux component command voltage generator for receiving the value of the measured actual magnetic flux component current and the value of the actual torque component current, computing and outputting a magnetic flux component command voltage; and an inverter for controlling the motor according to the torque component command voltage received from the adder and the magnetic flux component command voltage received from the magnetic flux component command voltage generator.