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The Design, Facture and Mechanism Simulation of the Traveling Wave Ultrasonic Motor

Author: WuYeKun
Tutor: ChenWen
School: Wuhan University of Technology
Course: Materials Science
Keywords: Ultrasonic motor Piezoelectric ceramics Finite Element Analysis Optimal design
CLC: TM359.9
Type: Master's thesis
Year: 2006
Downloads: 293
Quote: 1
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Abstract


The ultrasonic motor is a use of the inverse piezoelectric effect of the piezoelectric ceramic excited ultrasonic vibration, and is driven by a friction coupling, the electrical energy into mechanical energy of the new type of direct drive motor. Compared with traditional motor, it has the advantages of compact, low speed high torque, fast response and insensitive to electromagnetic interference, power-off self-locking, can be used in aviation, aerospace, automobile manufacturing, biotechnology, medicine, chemical industry, light industry precision instruments, and many other fields, has received extensive attention of scholars at home and abroad. The object of this paper is the main line of the wave-type ultrasonic motor, to carry out research work around the traveling wave ultrasonic motors and ultrasonic motors using piezoelectric ceramic material mainly includes motor requirements of piezoelectric material, motor preparation of the piezoelectric ceramic ultrasonic motor finite element simulation modeling of ultrasonic motors produced and Characterization. By the finite element method, the theoretical analysis method and equivalent circuit of ultrasonic motor performance requirements of piezoelectric materials. The results showed that: improve the piezoelectric coefficient, especially d 31 , and can significantly improve the surface of the particle displacement of the motor stator, thereby improving the driving efficiency; elastic supple coefficient of the change has little effect on the surface of the particle displacement, but The motor can effectively adjust the resonant frequency; dielectric loss motor will cause fever, affecting the speed of the motor output. Based on the performance requirements of the ultrasonic motor, piezoelectric ceramic materials, the design principles of the ultrasonic motor with a high-power piezoelectric ceramics. PSN-PZN-PZT, on the existing soft ceramic hard manganese the doping modification, the experimental results show that Mn doping amount of 0.5wt%, the material has the best overall mechanical and electrical performance, and the frequency-temperature stability performance greatly improved. The modified PSN-PZN-PZT used in ultrasonic motors using ANSYS finite element analysis software, the finite element model of the motor stator, the vibration of the motor type and its natural frequency, modal analysis, and to determine the optimal mode of the motor. Harmonic response analysis, based on considering the piezoelectric effect of piezoelectric ceramics, stator tooth height, the thickness of the piezoelectric patch structure parameters optimized design provides a theoretical basis for the optimal design of the ultrasonic motor stator. Optimal design based on the self-made piezoelectric ceramic ultrasonic motor to prepare. The stator in the vicinity of the resonance point change in capacitance, impedance, admittance characteristics provide an experimental basis for the design of the ultrasonic motor drive circuit. Stator resonant frequency of the measured results with finite element analysis results are very consistent. Ultrasonic motor prototype can be produced to achieve the following performance: output torque 0.80Nm; output load speed ≥ 100rpm: the positional accuracy of the output 30 '; motor efficiency ≥ 27%.

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