Advances on Tribology of Ultrasonic Motor and Its Friction Materials

Ultrasonic motor is a new kind of motor developed in recent years. It is different from conventional electromagnetical motors. It is a kind of motor drived by frictio nal force and has a lot of different properties from electromagnetical motors. At present, the new motor has been developed rapidly and entered practical application stage in some developed countries. There has been some investigating basis of ultrasonic motor in China. More and more attentions to the new motor are being paid by researchers and engineers. In ordor to promote the motor development in China, the research advances in tribology of ultrasonic motor at home and abroad are introduced and reviewed synthetically from several main aspects that are the contract driving and friction and wear properties between stator and rotor, the effect of ultrasonic vibration on tribological properties of interface of stator and rotor and the choices and life prediction of friction material in motor and so on. Based on the friction driving characteries of ultrasonic motor, several important research directions and topics are put forward.