嵌入式容栅传感技术及轴功率测试研究

Study on embedded capacitive grating sensing technology and shaft power testing

针对旋转轴功率测试存在的传感器信号引线困难、安装空间受限、信号易受干扰的问题,设计了一种嵌入式容栅扭矩、转速传感器和测试系统。测试时在轴的两端分别安装容栅传感器,轴在受到扭矩时产生扭角,则两容栅的输出信号会产生一个相位差,通过测量相位差的变化得到扭矩。容栅传感器的差动结构提高了灵敏度减小了误差,容栅的嵌入式安装,将对被测轴的影响降到了最低。实验证明容栅传感器可靠性高,可以在环境要求严格的情况下长时间使用,并且无需通过滑环、无线或红外进行供电和信号的传输,克服了以上方式安装复杂、信号易受干扰的缺点。

The difficulties in power measurement of revolving shaft are difficult signal transmission,limited installation space and signal disturbance.In order to solve the above problems,an embedded capacitive grating torque/speed sensor and related measuring system have been developed.Two capacitive grating sensors are installed on both ends of the shaft.When the revolving shaft is actuated by a torque,a twist angle is produced;and a phase difference between the outputs of the two capacitive grating sensors appears,and the phase difference represents the amount of the twist angle.Through measuring the phase difference,the torque is obtained.The differential structure of the capacitive grating sensor increases the sensitivity and decreases the measurement error.The embedded installation of the capacitive grating sensor decreases the effect on the shaft under test to the lowest.Experiment results show that the capacitive grating sensor is highly reliable and can be used under harsh environment for a long time.Besides,the capacitive grating sensor does not need to use slip ring,radio or infrared to transmit signal and power,which overcomes the shortcomings of complex installation and signal disturbance.