Dynamic Characteristic Of The Stator Of The Ultrasonic Motor Using The Non-Uniform Thickness Piezoelectric Ceramic

In this study, the application of non-uniform thickness piezoelectric ceramics on ultrasonic motors is studied. Since the present non-uniform thickness piezoelectric ceramics are mainly used to improve the working bandwidth of transducers or energy harvesters, and the method to increase amplitude of the stator of ultrasonic motors is mainly geometric shape optimization. Based on this, the idea that the non-uniform thickness piezoelectric ceramic can be used to increase amplitude of the stator of ultrasonic motors is proposed, and the feasibility of the idea are verified by finite element method simulation. It is found that the non-uniform thickness piezoelectric ceramic can effectively increase the amplitude and different variable thickness forms have different effects on the amplitude of the stator. The simulation results show that the convex paraboloid thickness variation has the greatest effect on the amplitude enhancement, and the thicker the non-uniform thickness layer, the larger the amplitude in the bending mode, which is beneficial to design of ultrasonic motor based on quadrature of bending mode. So it paves a way for future design of high-performance high power ultrasonic motors.