Patent ID: 6414462
Filing Date: 2002-07-02
Classification: H02P

Abstract:
A speed control apparatus for a synchronous reluctance motor comprising:a voltage detector for detecting a voltage applied to the synchronous reluctance motor; a first phase converter for receiving voltages in three phases outputted from the voltage detector based on the voltage detection thereof, and converting the three-phase voltages into equivalent voltages in two phases; a current detector for detecting a current applied to the synchronous reluctance motor; a second phase converter for receiving currents in three phases outputted from the current detector based on the current detection thereof, and converting the three-phase currents into equivalent currents in two phases; a rotor speed operator for receiving the two-phase voltages outputted from the first phase converter, thereby computing a speed of a rotor included in the synchronous reluctance motor; a speed controller for receiving a deviation between a speed command externally inputted and an output value from the rotor speed operator, thereby generating a torque-related current command; a current controller for receiving a deviation between a torque current command externally inputted and an output value from the rotor speed operator, thereby outputting a torque-related current command; a current controller for receiving a deviation between the torque-related current command outputted from the speed controller and a torque-related one of the two-phase currents outputted from the second phase converter, thereby outputting a torque-related voltage command along with a magnetic-flux-related voltage command; a voltage generator for converting the two-phase voltage commands, outputted from the current controller, into voltages in three phase; and an inverter for conducting a pulse width modulation for the three-phase voltages outputted from the voltage generator, and applying the resultant voltages to the synchronous reluctance motor.