A new speed/position control technique for travelling wave ultrasonic motor under different load conditions

Due to the rapid development of technology, the new applications are occurring into presence which request high efficient speed control and high efficient position control. So, travelling wave ultrasonic motors (TWUSM) have been drawn attention as important actuators for position control and speed control applications of late years. The relationship between rotor speed and different load behaviours of the TWUSM is not linear. In order to solve this nonlinearities and variation problems of TWUSM, proportional-integral (PI) controller, proportional integral-derivative (PID) controller, frequency controller and phase difference controller are proposed and implemented for position control and rotor speed control in this study. There are many speed control techniques such as frequency control, applied voltage phase difference control, applied voltage amplitude control. Besides these control techniques increase the efficiency of the system, we required to design control techniques which using TWUSM position control. For this we make use of the control system techniques such as controllers and compensation techniques. The proposed system evaluates the steady-state performance of TWUSM driver system by using PID controller, frequency controller, and phase difference controller. The obtained simulation results of the proposed technique are analyzed and presented with comparisons.