The contact mechanism of traveling wave rotary ultrasonic motor (TRUM) provides us with numerous advantages. Usually polymer friction material is bonded on the contact surface of the TRUM rotor, in order to obtain excellent mechanical characteristics, such as high efficiency, long life and so on. Unfortunately, the creep happens for the friction layer made of polymer material, due to the large pressure at the contact interface between the stator and rotor. In this paper the creep of the friction layer is taken into account at the contact interface, especially its effect on the startup characteristics of TRUM in long-term storage. Based on the contact model of TRUM the creep behavior of the friction layer is investigated at the contact interface between the stator and rotor. With the consideration of the friction layer creep, we tried to explain how the distributing contact forces applied on the interface affect the speed response characteristics of TRUM, as is shown in our experiments.
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