Ultrasonic motor's H-Bridge control circuit using phase-shift PWM method

Ultrasonic motor is a special kind of actuator for motion control system. Because of the peculiar mechanism of ultrasonic motor, control circuit is needed for the operation of ultrasonicmotor.The performance of ultrasonicmotor depends on the topology and modulation method of control circuit. A novel type of control circuit for ultrasonic motor, H-bridge control topology using phase-shift PWM method, is proposed in this paper. Two kinds of implementary circuits are designed and analyzed. On the basis of the new designed circuit, the difference of performances between the phaseshift H-bridge circuit and push-pull circuit is analyzed. The experimental results proved that, the performance of the proposed control circuit is good. © 2014 Brazilian Society for Automatics-SBA.