高精度反力矩测量系统研制及标定

Development and calibration of high precision counter torque measurement system

针对陀螺仪电机转矩波动高精度微力矩测量需求,提出了一种基于力矩器与角度传感器的高精度反力矩测量系统方案,基于共轴传递的阶梯轴结构,采用弹簧状游丝柔性连接外部接线,降低接线引入的弹性干扰力矩,实现了转矩波动的高精度测量;在传统砝码标定基础上,开展了测量系统静态标定及不确定度分析。实验结果表明,与优化前相比,系统测量精度提高了90%,在-10~10 mN·m的量程内,测量精度高达0.06%,线性度优于0.03%,漂移误差优于0.5μN·m/2 h,不确定度优于0.025%。

In response to the need for high-precision micro-torque measurement of the torque fluctuation of the gyroscope motor,a high-precision counter-torque measurement system based on a torque device and an angle sensor is proposed.Based on a coaxially transmitted stepped shaft structure,the external wiring is flexibly connected with spring like hairspring to reduce the elastic interference torque caused by wiring,and realize the high-precision measurement of the torque fluctuation;based on the traditional weight calibration,the static calibration and uncertainty analysis of the measurement system are carried out.The experimental results show that the system measurement accuracy is improved by 90%compared to before optimization.In the range of-10~10 mN·m,the measurement accuracy is as high as 0.06%,the linearity is better than 0.03%,and the drift error is better than 0.5μN·m/2 h,the uncertainty is better than 0.025%.