STUDY ON THE CONTACT MODEL OF ULTRASONIC MOTOR CONSIDERING SHEARING DEFOMATION

The interface contact model between the stator and rotor of a travelling wave type ultrasonic motor is presented, assuming that the rigid stator contacts the exible rotor over an area, and the frictional material is regarded as a distributed linear spring and without shearing deformation from which the mechanical characteristic of the motor and the interface transmission eciency are deduced. On this basis, the interface contact model taking account the shearing deformation of the frictional material, which better agrees with the practical situation, is proposed. Then the inuences of the motor’s parameters on its performance are investigated. The eectiv eness of the proposed model is validated by other researchers. K e y w o r d s: ultrasonic motor, contact model