Abstract:The relation between rotor speed of the Travelling wave ultrasonic motor (TWUSM) and current drawn by TWUSM is not linear for the TWUSM under different loads. In order to solve this nonlinearities and variation problems of TWUSM, PI controller, current controller, frequency controller and phase difference controller are proposed and implemented.The proposed system evaluates the steady-state performance of TWUSM drive system by using PI controller and current controller. Additionally, in the proposed TWUSM driv… Show more
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