【作者】 沈润杰； 王波； 郭吉丰； 魏燕定；

【Author】 SHEN Run-jie, WANG Bo,GUO Ji-feng,WEI Yan-ding (College of Electrical Engineering, Zhejiang University, Hangzhou 310027, China)

【机构】 浙江大学电气工程学院；

【摘要】 本文提出一种新型微超声波电机——斜齿型微超声波电机。它是利用压电材料的逆压电效应,将交流电信号转变成定子表面超声频率的机械纵向振动,借助于定子表面的斜齿与转子的相互压紧,使斜齿端面质点产生椭圆运动,实现转子单方向旋转运动,这种电机的驱动力矩较大、反向自锁力矩大、结构简单。文中将定子斜齿与转子接触分为三个阶段——接触黏着阶段、接触滑移阶段和分离阶段,建立定子斜齿与转子耦合的非线性动力学模型,并对其进行仿真研究,分析电机的瞬态响应特性及主要结构参数对电机机械特性的影响;最后,研制了尺寸为Ф10的斜齿型微型超声波电机,经过实验表明,电机的堵转力矩可达10mN·m以上,空载转速达到840r/min以上,连续运转性能良好。更多还原

【Abstract】 A new type of micro ultrasonic motor—skew teeth micro ultrasonic motor has been proposed in this paper. Using converse piezoelectric effect of piezoelectric material, mechanical longitudinal vibration of ultrasonic frequency appears on the surface of the stator.. In the presence of the compressing force between the skew teeth on the surface of the stator and the rotor, elliptic motion of the particles on the end face of the skew teeth can be generated, and the rotor realizes its unidirectional rotary motion. This type of motor has comparatively big driving moment, reverse self-lock moment and simple structure. The contact between the skew teeth of the stator and the rotator has been divided into three phases—contact adherence, contact slippage and separation. An unlinear dynamics model of the skew teeth of the stator coupled with the rotator has been set up, and emulation study has been carried out to analyze the transient response traits as well as the influence of key structural parameter to the mechanical traits of the motor. At last, a skew teeth micro ultrasonic motor with the diameter of Ф10mm has been produced. It is proved by experiment that the locked rotor moment of the motor reaches over10mN·m, the runaway speed reaches over 840r/min and the continent running capability is excellent.更多还原