Three Phase Motor Driving Apparatus

摘要

The present invention relates to a method of initially driving a three-phase motor, comprising transmitting a first PWM driving signal to an inverter to excite two phases corresponding to position of a rotor provided in the three-phase motor; measuring excitation phase current corresponding to the first PWM driving signal within a cycle of the first PWM driving signal by periods equal to the cycle of the first PWM driving signal; calculating a reference measured-value on the basis of values continuously measured by predetermined reference times from the first measurement with regard to the excitation phase current; calculating a compare measured-value on the basis of values continuously measured at predetermined compare measuring intervals by the reference times with regard to the excitation phase current after the excitation phase current is measured by predetermined delay times; and transmitting a second PWM driving signal for commutation according to rotation of the rotor to the inverter when the compare measured-value is higher the reference measured-value by a predetermined rate according as the reference measured-value is compared with the compare measured-value. Thus the present invention provides an initial driving method for a three-phase motor, in which position of a rotor is determined while the three-phase motor reaches a predetermined speed from a stop state, thereby decreasing power consumption in controlling commutation according to the position of the rotor, and reducing production cost.