Method of Torque Measurement Based on the Equivalent Theory of the Magnetic Field and Stress

The non-contact torque sensing application is used widely in modern measurement, but now the structure of torque measurement system was found to be relatively complicated. In this work, a non-contact torque measurement method based on the equivalent theory of the magnetic field and stress is proposed to detect the rotation angle of magnetization using thermodynamic equilibrium principle, and a theoretical model of equivalent stress and rotation angle of magnetization is established. The sensitivity of the torque measurement system reached 28.4 mV/(Nm) and the maximum nonlinearity error is 1.3%FS through the experiment, which verifies the feasibility of the torque measurement method.