Abstract

This paper proposes a new type of circular ring traveling wave linear ultrasonic motor with incomplete teeth. The motor’s movable slider is pressed against the end face of the tooth structure on the outer surface of the circular ring vibrator under a certain pre-pressure, four piezoelectric ceramic plates are evenly distributed at 90° intervals on the inner side of the circular structure, and four sets of driving teeth are arranged at 45° intervals from the position of the piezoelectric ceramic plates.When the motor is in operation, only one driving tooth works, and the life of the ultrasonic motor can be increased by rotating the different working teeth. The motor operates in two in-plane third-order bending modes that are orthogonal to each other at the same frequency. The dynamic design and simulation of the vibrator was carried out using ANSYS finite element software to analyze the effect of the structure on the mode. The principle prototype was fabricated, and the operating mode of the vibrator was measured using a laser Doppler vibrometer (LDV), and the vibration characteristics and output performance of the prototype were tested. Experimental results show that the motor runs smoothly at the excitation voltage of 240 V peak-to-peak, the excitation frequency of 30.459 kHz and the pre-pressure of 0.6 N, with the maximum output force of 90 mN and the motor no-load speed of 102 mm/s.

摘要

本文提出了一种新型不完整齿圆环行波直线超声电机。电机的活动滑块在一定的预压力下压紧在圆环振动器外表面上的齿结构端面，四片压电陶瓷片以90°间隔均匀分布在圆形结构的内侧，四组驱动齿与压电陶瓷片的位置间隔45°排列。电机工作时，只有一组驱动齿工作，通过转动不同的工作齿，可以提高超声波电机的寿命。电机以相同频率彼此正交的两个面内三阶弯曲模式运行。利用ANSYS有限元软件对振动器进行动态设计与仿真，分析结构对振型的影响。制作了原理样机，并利用激光多普勒测振仪（LDV）测量了振动器的工作模式，测试了样机的振动特性和输出性能。实验结果表明，在励磁电压峰峰值为240 V、励磁频率为30.459 kHz、预压力为0.6 N时，电机运行平稳，最大输出力为90 mN，电机空载。速度为102毫米/秒。并对样机的振动特性和输出性能进行了测试。实验结果表明，在励磁电压峰峰值为240 V、励磁频率为30.459 kHz、预压力为0.6 N时，电机运行平稳，最大输出力为90 mN，电机空载。速度为102毫米/秒。并对样机的振动特性和输出性能进行了测试。实验结果表明，在励磁电压峰峰值为240 V、励磁频率为30.459 kHz、预压力为0.6 N时，电机运行平稳，最大输出力为90 mN，电机空载。速度为102毫米/秒。