Research on exciting principle of circular cylindrical non-contact ultrasonic motor based on travelling-wave

A travelling-wave non-contact ultrasonic motor is proposed, whose stator is a circular cylindrical vibrator. The rectangle piezoelectric ceramics bonded on the outer surface of the vibrator are used as exciting supply. The exciting principle of travelling-wave along the circumferential direction of the vibrator is studied systematically. The relationships among the exciting supplies on space and time domains are given, which provide the theoretical foundation for designing and exciting the stator. Moreover, the connecting method between electric power and exciting supply is also discussed. Based on those theories, the prototype of the motor is fabricated for trial, and the revolution property is well.