V型直线超声电机梁式夹持的结构设计

Structure design of beam type clamp for V-shape ultrasonic motor

探讨了直线超声电机夹持结构的设计方法。依据直线超声电机夹持结构的设计准则建立了在弹性夹持下的定子力学模型;研究了夹持结构的法向和切向弹簧刚度对定、动子在接触界面上的法向压力和切向摩擦力的影响规律,并通过有限元软件进行了仿真分析。最后,提出了一种切向刚度充分大的夹持方式,并设计了相应的梁式夹持V型直线超声电机。通过实验对比了设计的梁式夹持超声电机与柔性圆弧式夹持电机的输出特性。结果表明:相对原有的圆弧式夹持电机,新直线超声电机的输出力增大了1.7倍,速度增大了4.6倍,其最大输出力达到37N,最大速度达到1.4m/s。研究表明,提高切向弹簧刚度有利于提高电机的输出力和速度,设计的梁式夹持V型直线超声电机输出特性及稳定性良好。

This paper focuses on the structure design of liner ultrasonic motors.The mechanical model of stators with flexible clamping components was established according to the design criterion for clamps of liner ultrasonic motors.Then the influence rules of tangential and normal rigidities of the clamping components on the normal pressures and tangential friction forces of stators and actors on a contact interface were researched and analyzed by finite element software.Finally,a new type clamping method with enough tangential rigidity was put forward,and the corresponding V-shape ultrasonic motor with beam type clamp components was designed.The output performance of the designed V-shape ultrasonic motor was compared with the original V-shape liner ultrasonic motor with flexible cambered clamp components.And the results show that the maximum output force of the designed motor reaches 37 N,1.7times as high as that of the original motor,and the maximum noload speed is 1.4m/s,4.6times as fast as that of original one.The concludes indicate that enhancing tangential rigidity is conducive to increasing the output force and velocity of the motor.The V-shape liner ultrasonic motor with beam type clamp components has great output performance and stability.