Study on Output Model and Test of a New Kind of Magnetoelastic Force Sensor

To measure the force which act on a mechanical equipment on-line and make the fault diagnosis, a kind of the non-contact force sensor with three magnetic pole based on magnetoelastic effect was designed and its operation principle and the mathematical model of induced voltage output were also derived out in this paper. The output characteristic of the sensor affected by field current intensity, frequency, and the gap between the probe of the sensor and the surface of the material tested was analyzed by testing. The calculation result based on the output model found by the paper accord basically with the test result. The results of the test have showed that the measuring precision and sensitivity of the sensor can meet the demands of the general practical application.