Design and Evaluation of a Magnetoelastic Tensile Force Sensor

Anotace: This paper introduces the basic theory behind magnetoelastic sensors which are bas ed on the change of magnetic properties(permeability) due to mechanical stress (Villari effect). A well-known magnetoelastic sensor, the Pr essductor, is described. Asimulation model of a sensor is created, described, and evaluated by computing the static transfer characte ristic of RMS secondarycoil voltage change due to tensile stress. A real sensor is then manufactured fr om a polycrystalline transformer sheet andexperimentally tested by using a tensile load created by water weight. The si mulation and experiment show similar behavior but arenot completely identical which is most likely since some material properties were taken from literature rather than from experimentalmeasurements, like the magnetostriction coefficient and initial magnetic susceptibility.