时栅位移传感器的动态特性研究

为了解决时栅角位移传感器的动态测量问题，在基于静态的时栅位移传感器电磁仿真的基础上，通过引入运动单元模块，建立了时栅位移传感器的动态电磁仿真模型。通过分析时栅位移传感器的感应电动势幅值信号和感应频率信号，得到了动态条件下的时栅位移传感器感应电动势幅值和频率与转子转速的关系，并测算了磁场式时栅位移传感器在激励频率为400Hz的情况下，理论上能够达到的极限转速为8r/min。实验结果表明，转子转速在0～8r/min时传感器动态误差为±1.4″,速度超过8r/min时传感器精度开始恶化，转子转速为10r/min时传感器误差为±8.2″。

Study on Dynamic Performance of Time Grating Displacement Sensor

In order to solve the dynamic measuring problem of time grating angular displacement sensor, through introducing motion unit module, a dynamic electromagnetic simulation model was established based on the static state electromagnetic simulation of time grating displacement sensor.The relationship among amplitude, frequency of the induced electromotive force and the speed of the rotor as well as magnetic field distribution was analyzed when time grating displacement sensor functions under its dynamic conditions. It is also predicted that the maximum speed is approximately 8r/min theoretically when the time grating displacement sensor is running with 400Hz excitation frequency. The experimental results show that the error of the time grating displacement sensor is as ±1.4″ under the speed of 0～8r/min and when the rotary speed of the time grating displacement sensor exceeds 8r/min, the error of the time grating displacement sensor begins to deteriorate. The error of the time grating displacement sensor is as ±8.2″ at the speed of 10r/min.