Working Mechanism of a Kind of Non-resonant Linear Piezoelectric Motor with Flexible Driving End

A non-resonant piezoelectric linear motor with a flexible driving end, which has an extensive working frequency range and good operation stability, is studied theoretically and experimentally. Based on the microscopic vibration characteristics of the motor stator, the longitudinal vibration model is established for the whole motor system. According to the Coulomb friction model and the motor vibration model, the friction mechanism of the non-resonant piezoelectric linear motor is investigated by dynamical analysis of the whole motor system. Furthermore, the vibration characteristics and mechanical output characteristics of the stator are simulated and experimentally studied on the basis of the friction drive mechanism model. Finally, both the simulation and experimental results show that this kind of motor remain stable in the frequency domain from 2.2 kHz to 3.5 kHz and that when the pre-stress is 4 N and the driving voltage is 90 V, the maximum velocity of the motor is above 4 mm/s and the maximum thrust is nearly 0.5 N.