Hysteresis Loop Measurement for Steel Sheet under PWM Excitation Condition
Xinyang Gao, Nana Duan* and Shuhong Wang
Published: August 19, 2022
Abstract
This article adopts a method of measuring the hysteresis loop of oriented silicon steel sheet under the excitation of pulse width modulation (PWM) signal. A measurement platform was built on the basis of the traditional Epstein frame method. According to international standards, the length of the equivalent magnetic circuit of the Epstein frame was calculated, and the harmonic control method was used to achieve the measurement of the hysteresis loop of the oriented silicon steel sheet under PWM excitation. Starting from the traditional sinusoidal excitation, this paper measures the variation of the hysteresis loop of the silicon steel sheet under different frequency excitation. On this basis, the waveform control and PWM signal output programming were carried out through the host computer, and the influence of high-order harmonics of different frequencies on the magnetic properties of the oriented silicon steel sheet under PWM excitation was compared. Provide theoretical basis for the design and research of transformer laminated core.