一种用于高旋稳定弹药的超声电机调速系统

针对高旋转制导弹药平台的固定式鸭舵控制,提出了一种旋转型行波超声电机驱动进给机构的制动方式和舵机调速系统,搭建了舵机性能测试试验平台并获得了良好的速度控制性能。首先,采用库伦加黏性摩擦理论建立了超声电机驱动的制动盘和旋转盘之间的摩擦制动模型,综合考虑超声电机的机械负载特性,计算了制动盘对旋转盘产生的摩擦力矩,得到了旋转盘(外壁设计有舵翼)的转速输出方程;其次,结合试验与仿真分析,测定了结构的阻尼系数;最后,通过试验验证了基于超声电机作动制动模型的正确性,测量了舵机的速度控制曲线,引入速度波动率来衡量速度控制效果。试验表明,舵机速度调控响应时间小于150ms,速度波动率能够控制在10%以内。

An Adjustable Speed System Using Ultrasonic Motor for High Spin-Stabilized Projectile

A braking method of traveling wave type rotary ultrasonic motor (TRUM) driving feeding mechanism is designed. and a speed regulating system of a rudder-actuator is proposed to control the fixed canards in the high rotating guided ammunition. The test platform is established for the actuator and the performance of speed control is tested on it. First, the model of the frictional braking between the brake disc and the rotating disc is built based on the Coulomb and viscous friction theory. Considering the mechanical characteristics of the TRUM, the frictional torque is calculated, and the dynamic equation of the rotating disc (including rudder wings) is obtained. Then, combined with the experiment and simulation, the damping coefficient of the structure is determined. Finally, the correctness of the frictional braking model is verified by experiments. The speed control curve of the rudder-actuator is measured, and the speed fluctuation rate is introduced to measure the speed control effect. It shows that the speed control response time of the rudder-actuator is less than 150 ms, and the speed fluctuation rate is less than 10%.