A High Revolution Speed Noncontact Ultrasonic Motor Driven by a Non-Symmetrical Electrode

A noncontact ultrasonic motor based on a non-symmetrical electrode is proposed. This motor has the advantages of using a simple driving electrode and having a high revolution speed. The revolution speed of its three-blade rotor can reach 5100rpm under a driving voltage of 20V. A method operated easily is proposed to measure the output torque.