Non-contact torque sensor based on magnetostrictive Fe₃₀Co₇₀ alloy

A non-contact torque sensor based on a magnetostrictive Fe30Co70 rod wound with an excitation coil and pickup is proposed in this paper. In the magnetic field range 0–30 kA/m, changing rate linearity of magnetostriction loading samples are significantly improved after heat treatment. Maximum 103 ppm annealed sample parallel direction, while its tensile strength allowable shear stress 608 194.56 MPa, respectively. According to mathematical model presented work, there linear relationship between output voltage torque. An apparent increase induced signal (peak voltage) 48.23 mV observed as increases 20 Nm case applying sinusoidal signals. addition, experimental results consistent calculated values within 0–16 Nm, good sensitivity 2.87 mV/Nm obtained. This work shows prospect alloy for sensing appropriate property no orientation requirement.