The pulse magnetic field method for measuring magnetization curves of silicon steel under highly saturated state

Abstract

Silicon steel in high power density motors typically operates at high saturation points (above 2 T). However, existing magnetic measurement methods currently struggle to accurately measure the characteristics under highly saturated conditions. Therefore, this paper proposes a Pulse Magnetic Field (PMF) method, which generates a sufficient excitation magnetic field to measure the magnetic properties of silicon steel under highly saturated states. Firstly, the feasibility of the method is proved by principle and simulation. Secondly a signal processing method is proposed to solve the noise, zero drift, and localization. Then the experiments show that the PMF method can generate a magnetic field of over 1,40,000 A/m, causing the silicon steel to reach a high saturation state, over 2 T. Finally, the effect of capacitance value on the measurement of the intrinsic magnetization curve is explored. The test results show that the PMF method can quickly and accurately measure the intrinsic magnetization curve of silicon steel materials under high saturation. Compared with the existing method, the error is about 1 %.