Analysis and phase control of a piezoelectric traveling-wave ultrasonic motor for haptic stick application

An original modeling of a traveling-wave ultrasonic motor is established in order to provide a new torque control law for this category of actuators. In particular, self-driving is implemented, avoiding the classical drawbacks of frequency control, i.e., pull-out phenomenon. With such a robust control, force feedback application is available. Experimental results are obtained on an active haptic stick.