SPEED CONTROL SYSTEM FOR BLDC MOTOR CAPABLE OF CONTROLLING TORQUE OF BLDC MOTOR

摘要

PURPOSE: A speed control system is provided to achieve improved efficiency and reduce noises by controlling the torque of the BLDC motor which is driven by the phase current having a sinusoidal current waveform. CONSTITUTION: A speed control system comprises a voltage control unit(210) for outputting three-phase voltages to an inverter unit(200) for driving a BLDC motor(M); a current control unit(260) for outputting a voltage command signal corresponding to the voltage output from the voltage control unit, to the voltage control unit; a rotor position detection unit(230) for detecting the position and rotating speed of the rotor of the BLDC motor; and a speed compensation unit(250) for transmitting a current command signal to the current control unit by compensating for the error caused due to loads during the operation of the BLDC motor through the speed of the rotor detected by the rotor position detection unit and the average speed of the BLDC motor.