一种新型固态摩擦驱动器

A New Type of Solid State Frictional Actuator

设计和装配了一种新型固态摩擦驱动器（具有对称双面齿和压电陶瓷结构的行波型超声波马达）的实验样机。该样机提供一种新颖的对称式双面设计结构，实现将材料点的椭圆形运动轨迹耦合到两个独立的接触表面，本质上，增大了马达输出力矩的能力。新型马达具有小型量轻、响应速度快、无电磁干扰、力矩波动小、高的力矩密度和输出端不需要齿轮降速机构而直接实现驱动等特点。阐述了新型马达的工作原理，用有限元法（ＦＥＭ）分析了马达振动体部分的各阶振动模态和相应的固有频率，分析中计入了压电陶瓷的压电效应对模态和频率的影响。采用ｖｏｎ－ｍｉｓｅｓ法获得了振动体２Ｄ和３Ｄ动态变形分布和应力分布，数字计算优化了马达的结构形式。

A new type of solid state frictional actuator(traveling wave ultrasonic motor with zygomorphic teech projections and piezoceramics)has been designed and fabricated.The new prototype provides the novel construction of the symmetric two sided design,which couples the elliptical locus of any material point to respective interfaces,inherently,increasing the motor′s torque capability.The prototype combines the advantages such as compactness,quick response,absence of electromagnetic interference,tittle torque ripple,high torque density,direct drive without intermediate gears etc.In this paper,the drive mechanism of vibrating elements is discussed.The vibration modes and corresponding resonance frequencies of the motor were analyzed by the finite element method (FEM) in which the piezoelectric effect of piezoelectric actuators bonded on the stator is taken into consideration.Accurate 2D and 3D deformation fringes and stress distribution of any material point on the stator were obtained using von mises method.Consequently,the concrete construction of the stator was optimized using the numeral computation method.