This paper analyses and compares experimentally the magnetic hysteresis losses evolution in iron steel sheets submitted to different supplies: sinusoidal, square, triangular, two and three-level PWM voltage waveforms. The magnetic induction amplitude influence and the modulation index are investigated for Two and Three-level PWM voltage waveforms. The experimental investigation is performed using a workbench with a closed loop PWM inverter for imposing the induced voltage waveform on the secondary winding of an Epstein frame.
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