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Design and simulations of a 2DOF ultrasonic motor

A 2DOF ultrasonic motor structure is designed and simulated using finite element method (FEM) in this study. The ultrasonic motor structure is consist of two resonant driver rods and one driven shaft between. Each driver rod is equipped with four stacked piezoelectric actuators to perform resonant functions. Different resonant modes of the driver rods, the driven shaft, and the overall assembly would be excited to conduct different motion characteristics. Preload and non-preload conditions for the driver rods are studied as well, and assembly of a half portion or an overall ultrasonic motor structure are simulated considering contact and constraint boundaries as well. The adequate resonant modes to perform the driven shaft's liner and rotary motion, respectively, arc calculated and tabulated in this study.