Magnetic circuit design and analysis of giant magnetostrictive force sensor based on the Villari effect

Based on the Villari effect of giant magnetostrictive material, a new giant magnetostrictive force sensor is proposed. The magnetic flux is measured by the Hall element in the structure, to realize the measurement of external load. Firstly, according to the structure and working principle of the giant magnetostrictive force sensor, its closed magnetic circuit is analyzed. Secondly, based on the basic theory of electromagnetic field, the magnetic circuit of the giant magnetostrictive force sensor is calculated by the finite element method. Finally, the specific factors affecting the output characteristics of the sensor are deeply discussed. The results show that the closed magnetic circuit can effectively avoid magnetic flux leakage, and it is reasonable to use the hall principle and Villari effect to measure the external load, which provides a technical way for the further research of giant magnetostrictive force sensors.