摘要
提出一种大功率夹心式纵弯复合直线超声电机。电机定子主体结构由2个小端相连的指数形变幅杆组成,并在连接处设有驱动足。纵弯振动叠加并在驱动足处产生具有驱动作用的椭圆轨迹。在经典变幅杆理论和变幅杆弯振的传递矩阵分析法的基础上,利用有限差分法,分析各结构参数变化对纵弯谐振频率变化的灵敏度,选取敏感度最大的参数作为设计变量,将电机的纵弯频率简并至27.476kHz。有限元仿真和阻抗特性测试结果与理论计算结果吻合。讨论分析了纵弯振动间的耦合作用并提出带耦合环节的等效电路模型拓扑结构,并利用单相驱动实验验证模型的正确性。电机样机的最大速度为1280mm/s,最大推力为45N。
A linear ultrasonic motor using longitudinal and bending （L-B） hybrid Langevin transducer was proposed. The main structure consists of two exponential horns intersecting at driving foot. L-B vibrations are superimposed and elliptical locus is generated at driving foot. Sensitivity analysis of structure parameters to the L-B resonant frequencies were performed using finite difference method based on the classical horn theory and flexural horn transfer matrix analysis method, and frequencies were degenerated to 27.476 kHz by choosing the most sensitive parameter. Finite element method （FEM） simulation and impedance characteristic test agreed well with the calculated results. The coupling, effect between L-B vibrations was studied and its equivalent circuit model with coupling elements was proposed and testified by one phase driving experiment. The maximum speed and thrust force were 1 280 mm/s and 45 N.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2010年第9期55-61,共7页
Proceedings of the CSEE
基金
国家自然科学基金项目(50875057)~~
关键词
超声电机
灵敏度分析
有限元法
耦合效应
ultrasonic motor
sensitivity analysis
finite element method （FEM）
coupling effect
