Modeling,analysis and suppression of current harmonics of Langevin-type ultrasonic motors under high voltage |
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| Affiliation: | 1. State Key Laboratory of Mechanics and Control of Mechanical Structures, College of Aerospace Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China;2. School of Mechanical and Electrical Engineering, Guilin University of Electronic Technology, Guilin 541004, China;1. College of Mechanical Engineering, Suzhou University of Science and Technology, Suzhou 215009, PR China;2. Suzhou Changfeng Avionics Co., Ltd., AVIC, Suzhou 215151, PR China;3. Key Laboratory of Special Purpose Equipment and Advanced Manufacturing Technology, Zhejiang University of Technology, Hangzhou 310023, PR China |
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| Abstract: | 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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| Keywords: | Ultrasonic motor Current harmonics Equivalent circuit model Tuning method |
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