Torque Sensing Technology Based On Magnetic Barkhausen Effect

As one of the main power output forms of the mechanical device,the shaft system transmission mainly provides torque for the mechanical device through the power shaft,and drives the equipment to work normally.The state and working characteristics of the whole power system can be reflected by torque,and the overall performance of mechanical equipment can be evaluated,so the torque sensing of the transmission shaft is particularly important.The conventional methods of torque sensing include resistance strain gauge method,drilling method,piezoelectric measurement method,fiber Bragg grating method,ultrasonic detection method and magnetoelastic effect method.In this paper,the principle of Magnetic Barkhausen torque sensing technology is discussed in detail,and then a torque sensing method based on Magnetic Barkhausen noice(MBN)effect is proposed.This method uses axial stress to measure torque,and uses the characteristic value of Magnetic Barkhausen noise as a new parameter to represent torque.It can realize the real-time monitoring and non-contact measurement of torque,which provides a new idea for torque measurement.The main work of this paper is as follows:Firstly,the principle and timing of Magnetic Barkhausen noise are described from the perspective of magnetic domain and hysteresis loop of ferromagnetic materials,then the influencing factors and functions of MBN signal are introduced,and the eigenvalues of MBN signal are analyzed.Finally,the torque transmission based on MBN effect is obtained by establishing the equivalent model of stress and magnetic field and the relationship between torque and axial stress.Sense mathematical model.Secondly,the overall scheme of MBN effect torque sensing is designed,and the hardware and software system of MBN characteristic experiment is built,including excitation system,detection system,axial excitation structure and upper computer software part,and the excitation effect of excitation structure is simulated by finite element method;the experimental platform adopts suspension tensile experimental structure with uniform force.Through the tensile test,the performance of the experimental system is tested.The influence of excitation frequency and excitation voltage on the MBN signal of different materials is analyzed.The suitable working point is selected.The influencing factors,sensitivity,repeatability error and other indexes of the experiment are analyzed.Finally,the overall scheme of torque measurement experiment based on MBN effect is designed.Through a large number of experimental research on the experimental data processing and error analysis,summed up the advantages and disadvantages of torque experiment,in order to improve later.Experiments show that the torque sensing scheme based on MBN effect is feasible.This method of characterizing torque by MBN eigenvalues provides a new way of thinking and direction for torque measurement.