Research on the performance simulation of multi-stator traveling wave type ultrasonic motors

In order to improve the output performance, multi-stator structure is applied to traveling wave type ultrasonic motor (TWUM). In this paper, taking into account the multi-stator traveling wave type ultrasonic motor (MSUM) with diameter of 60mm, authors apply the elastic contact principle to deduce the MSUM's simulation model. By reason of machining errors and installation errors, the stators and rotors can't agree uniformly. So the errors of different stators and rotors are added into this simulation model. According to the actual motors' structure parameters, the operational characteristics are presented. In this paper, by given the varied applied torque, the MSUM's operation performance is obtained. The measurement is also executed. The simulation results agree with testing results. And it shows this simulation model is valid. This model makes it possible to predict most of the behavior and performance characteristics of MSUM as a function of the external loading parameters. And the conclusion can also guide the design and assembly of MSUM.