MOTOR-DRIVING APPARATUS FOR VARIABLE-SPEED MOTOR

摘要

An object of the invention is to provide a motor-driving apparatus for driving a variable-speed motor, which increases a motor torque and efficiency at a high rotation speed. The motor-driving apparatus has a three-phase inverter and a boost DC/DC converter, which are operated the single-phase-switching method. The three-phase inverter consists of a nine-switch inverter applying the three-phase voltage to two three-phase windings of the motor. The single-phase-switching method reduces a switching power loss of the nine switch inverter largely. The boost DC/DC converter boosting a battery voltage reduces a copper loss of the inverter and the motor, too.