Matrix vs Pulse-Width-Modulation Frequency Converters. Iron Losses under Pulsating Forms of Voltage Excitation

A Single Strip Tester was used to measure iron losses in laminations of non-oriented electrical steel magnetised under typical supply of a 2-level PWM (line-to-line) and three-phase matrix converter (line-to-neutral). Results show the beneficial effect of the harmonic characteristics of voltage excitation produced by direct ac-ac converters on the performance of soft magnefic material, commonly used in laminated stator cores of induction motors.