Design of a New Magnetoelastic Stress Sensor

To measure precisely the stress acted on mechanical equipment on-line and make the fault diagnosis, we designed a new the non-contact sensor with three magnetic poles based on magnetoelastic effect, analyzed and derived its operation principle and the mathematical model of induced voltage output 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.