Matrix vs pulse-width-modulation frequency converters. Iron losses under pulsating forms of voltage excitation

摘要

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 magnetic material, commonly used in laminated stator cores of induction motors.