Driving Mechanism Analysis of Cylindrical Ultrasonic Motor with Bending Vibration Mode
Dong Yinghui(1),Huang Kang(1),Zhao Chunsheng(2)
(1 School of Mechanical and Automobile Engineering, Hefei University of Technology, Hefei 230009, China)
(2 Research Center of Ultrasonic Motor, Nanjing University of Aeronautics and As tronautics, Nanjing 210016, China)

Abstract: Driving mechanism of the cylindrical ultrasonic motor with the first bending vibration mode is investigated. The total elliptical motion trace of a particle on the stator is derived in three-dimensional space. To research the distinguished feature of the driving mechanism of the cylindrical ultrasonic motor, the elliptical motion is decomposed into the effective elliptical motion perpen dicular to the stator end surface and the radial linear motion. The effectiveel liptical motion drives the rotor, meanwhile the radial linear motion brings out radial slip between the stator and rotor with great energyloss. The influence on the motion stabilization of the rotor is analyzed based on the effective ellip tical motion as the amplitudes of two phases of vibration are unbalanced or the phase difference is arbitrary.
Keywords: ultrasonic motor, effective elliptical motion, motion stabilization.