Research And Design Of Torque Measurement System Based On The Inverse Magnetostrictive Effect

In the mechanical transmission system, torque is an important performance index,which reflects the system performances of equipment. Achieving non-contactmeasurement of the rotation and dynamic conditions is the development direction of thetorque sensor. Torque measurement principle based on magnetic bomb has the advantagesof non-contact and good dynamic characteristics, and combines with the development ofthe new inverse magnetostrictive material to further improve the measurement accuracy.This paper analyses the research progress and application of the inversemagnetostrictive material, Fe amorphous alloy is identified as magnetostrictive material ofthe sensor. Use the inverse magnetostriction effect to analyse and design the structure ofthe sensor and the measurement mode. Design a source of high-frequency excitationsignal based on the need of the excitation coil of the sensor. In response to the outputcharacteristics of the signal, the signal processing circuit is designed, the circuit achievesthe signal amplification, demodulation and filtering, and obtains the output DC signal ofthe torque in the end. Design the signal acquisition circuit based on the the ATmega128MCU, and transmit the collected singnal to the host computer, in order to achieving thereal-time display and analysis of the torque signal.Use the LabVIEW software to design the part of the host computer. The hostcomputer receives the datas from the microcontroller through the serial communication toachieve the functions of a real-time display and storage of the signal, the calls historicaldata, and data analysis and processing. Not only improve the system level of intelligence,but also reduce the use-cost of hardware resources.According to the current situation of dynamic torque calibration. The paper designsdynamic torque loading system based on magnetic particle brakes. And introduces theworking characteristics of the powder brake, and introduces a different type of torque loadsignal. The paper also uses a control method based on fuzzy adaptive PID. So that the loadtorque of the loading system output achieves the requirements of the different signalsthrough the control of the excitation current of the magnetic brakes.Through modeling and simulating in Simulink, and compared with the traditional PID control methord, the papershows that fuzzy adaptive PID can control the current effectively, so that the loadingsystem’s output of torque signal can be more accurate.