SENSORLESS DYNAMIC DRIVING METHOD AND SYSTEM FOR SINGLE PHASE ALTERNATING CURRENT PERMANENT MAGNET MOTOR

摘要

A sensorless dynamic driving method and system for a single phase alternating current permanent magnet motor. The back electromotive force of motor windings is detected, and the direction and the duration of the current flowing through the motor windings are controlled based on the wave form of the back electromotive force. The half period of each wave form of the back electromotive force is separated into a supplying power zone and a waiting power zone, or a front waiting power zone, a supplying power zone and a rear wanting power zone, and the current flows through the motor windings in the supplying power zone so that the rotor of the motor is effectively driven. The method and the system not only simply the structure, reduce the size, save the cost and enhance the reliability of the motor, but also increase the starting performance and improve the efficiency of the motor.