Core Losses Analysis for Soft Magnetic Materials under SPWM Excitations

This paper illustrates the core loss analysis for non-grain-oriented silicon steel, grain-oriented silicon steel, and soft magnetic composite (SMC) materials under sinusoidal excitation and Sinusoidal Pulse Width Modulated (SPWM) excitations. The SPWM voltages with their modulation and carrier ratio have been created by MATLAB for experimental verification. The standardized measurement methods: Epstein Frame method and ring sample method, have been used to test the soft magnetic materials. The core losses from different experimental data have been analyzed. The results show that the core losses under three different SPWM excitations depending on the modulation and carrier ratios of PWM waveforms are different from the core losses supplied by sinusoidal excitations. And also, it can be found that the magnetic behavior of the material affects the core loss under non-sinusoidal excitation.