Journal
PRECISION ENGINEERING-JOURNAL OF THE INTERNATIONAL SOCIETIES FOR PRECISION ENGINEERING AND NANOTECHNOLOGY
Volume 64, Issue -, Pages 177-187Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.precisioneng.2020.04.009
Keywords
Ultrasonic motor; Current harmonics; Equivalent circuit model; Tuning method
Categories
Funding
- National Natural Science Foundation of China [51675278, 51905265]
- Fundamental Research Funds for the Central Universities [NP2018301]
- China Postdoctoral Science Foundation [2019M661820]
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For achieving high speed and large thrust, Langevin-type ultrasonic motors (LTUM) are generally operated under high voltage. However, high voltage causes the current harmonics of piezoelectric material nonlinear phenomena, which will decrease the efficiency, the output force, and the accuracy of LTUMs. In this study, the nonlinearity of current harmonics of LTUM are described and analyzed by a novel nonlinear equivalent circuit model using Lagrange equations. Thereafter, based on a nonlinear tuning method, a specific driver circuit is suggested to suppress the current harmonics. Experimental results validate that the time response of the current is consistent with that of the model and furtherly demonstrate that the total harmonic current distortion decreases by 68% utilizing the proposed nonlinear tuning method under 500 Vpp.
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