差动感应式扭矩传感器及其有限元分析

扭矩是机械设备运行状态的重要监测信息，设计了一种新型差动感应式扭矩传感器，其输出绕组采用分段差动式串接，工作时首先利用弹性轴拾取扭矩信号，再通过电磁感应原理将负载扭矩转换成输出绕组的感应电动势。根据欧姆定律和磁路的基本定律推导了传感器的输出特性，并建立了传感器的有限元模型，对传感器在空载和负载运行时的磁场情况进行了仿真，验证了测量原理的正确性。采用高精度扭力扳手对传感器样机进行了标定，结果是灵敏度约为32.6 mV/(N·m)，线性误差约为0.24%，重复性误差约为0.16%，迟滞误差约为0.18%。

A Differential Induction Torque Sensor and Its Finite Element Analysis

Torque is an important information for monitoring the condition of mechanical equipment,a novel differen-tial induction torque sensor is designed in this paper,the output winding is connected with differential piece-wisely. Firstly,the torque signal is got by sensor shaft,and then the load torque is converted into the induction electromotive force of output winding based on the principle of electromagnetic induction. The sensor output characteristic is de-duced according to the basic law of the magnetic circuit and Ohm’s law,and the finite element model of the sensor is established,the magnetic field at no-load and load are simulated, and the measurement principle of sensor is verified. The sensor prototype is calibrated by high precision torque wrench,and the results show the sensitivity is a-bout 32.6 mV/Nm,the linearity error is about 0.24%,the repeatability error is about 0.16%,the hysteresis error is about 0.18%.