SYSTEM FOR DRIVING A PERMANENT MAGNET BRUSHLESS DIRECT CURRENT(PM BLDC) MOTOR AND DRIVING METHOD THEREOF

摘要

The drive device of the PM BLDC motor using the three harmonics according to the present invention, the rectifier for receiving a single-phase AC power to convert the DC to output; An inverter converting the DC power input from the rectifier into a three-phase AC power and providing the same to the PM BLDC motor; A third harmonic detection circuit unit connected to each of the three-phase lines connecting the inverter and the PM BLDC motor by Y-connections and detecting a third harmonic voltage of the PM BLDC motor; A hysteresis current control unit connected to any two phases of a three-phase line connecting the inverter and the PM BLDC motor, and detecting hysteresis current by detecting the connected two-phase currents; A Hall sensor signal generation unit receiving an output signal from the third harmonic detection circuit unit and the hysteresis current control unit and generating an estimated Hall sensor signal; A gate driver configured to receive an output signal from the hall sensor signal generator and generate a gate signal for driving a gate terminal of the semiconductor switching device in the inverter; And a hysteresis current controller and a hall sensor signal generator, electrically outputting a driving start signal of the hall sensor signal generator, and receiving a hall sensor signal from the hall sensor signal generator to control PI and D / A. And a main controller to output a control signal for controlling the hysteresis current controller.