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Modeling of a piezoelectric rotary ultrasonic motor

1995; Institute of Electrical and Electronics Engineers; Volume: 42; Issue: 2 Linguagem: Inglês

10.1109/58.365235

2373-7840

Nesbitt W. Hagood, Andrew J. McFarland,

Innovative Energy Harvesting Technologies

A piezoelectric rotary ultrasonic motor is modeled for the purpose of predicting, a priori, motor performance as a function of design parameters. The Rayleigh-Ritz assumed mode energy method is used to model the distributed piezoceramics and the traveling wave dynamics of the stator. Natural frequencies and modeshapes are obtained for a generally configured motor. Nonlinear normal and tangential interface forces between the rotor and stator are incorporated into the forcing function along with the linear piezoelectric forcing. Given the applied torque, applied axial loading, and piezo drive voltages as inputs to the model, general motor performance measures are obtained-namely speed, input power, output power, and efficiency. The approach presented here provides a general framework for modeling these motors as well as a design tool for optimizing prototypes with the added flexibility of allowing for a wide variety of geometries and materials. >