Com parison of the Traveling-wave Ultrasonic Motor with the Ultrasonic Motor Using Longitudinal and Torsional Vibration Model

Based on current development of the ultrasonic-motor using longitudinal and torsional vibration modes and the traveling-wave ultrasonic-motor,this paper analye them in detail from three aspects:driving mechanics of the ultrasonic-motor,energy conversion based on convert piezoelectric effect of piezoelectric ceramic and contact form between stator and rotor;it points out that the ultrasonic-motor using longitudinal and torsional vibration models has more dominance to improve performance of the motor than the traveling-wave types;also,it briefly illustrates some disadvantages on preventing the development of the ultrasonicmotor using longitudinal and torsional vibration modes.Finauy,this paper indicates that the perspective of the ultrasonic-motor using longitudinal and torsional vibration model is beautiful.