Abstract
It has difficulty in nonlinear modeling of performance characteristic of ultrasonic motor for its complex micro-structure. Through matching three sets of Vpp-Im data measured near the resonance frequencies of five ultrasonic motors, we run PSIM 6.0 to extract a new model in which nonlinear resistance and micro capacitance are tuned till touching the minimum relative errors between model Vpp (mean)-I1 data and measured Vpp-Im data. The experimental results show that five key parameters of this model match for actual driving data of ultrasonic motors with diameter of 45mm and their waveforms show well too. This work will provide both compact ideas for future nonlinear modeling and applied simulation basis for its ASIC design.
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