An equivalent wear method of friction material for ultrasonic motor

As one of key materials for improving the performance of ultrasonic motor, the wear of friction material plays an important role in contact friction properties and output performance of ultrasonic motors. However, the wear loss of friction material is small in the friction system of ultrasonic motor. If effects of wear of friction material on properties of ultrasonic motor studied with a real motor, the experiment process were time-consuming and low efficiency and influenced by lots of known or unknown factors. In this paper, based on operation principle and wear characteristics of ultrasonic motor, an equivalent wear experimental method which using reduction of thickness of friction material equivalent to wear of friction material was proposed. And the relationships between wear of friction material and performance of ultrasonic motor were established. Validity of the method was carried out on one 60 traveling wave ultrasonic motor. This research could provide a new method for studying performance and life of ultrasonic motor.