Study on Resonance Frequency of the Longitudinal and Torsional Ultrasonic Motor

Resonance frequencies of the longitudinal and torsional ultrasonic motor were studied in this paper.It was shown that there was close relationship between load factor and resonance frequency of ultrasonic motor.The resonance frequency of ultrasonic motor decreased as the load factor increased,which meant that the material with large acoustic impedance should be used in stator of ultrasonic motor in engineering design to ensure the resonance frequency of ultrasonic motor influenced by load at least.Experiments showed that the theoretical resonance frequency of the longitudinal and torsional ultrasonic motor was in a good agreement with the measured result.