New considerations regarding frequency influence on soft magnetic materials characteristics

The soft magnetic materials as electric sheets are used successfully in electrical equipments as electrical rotating machines and transformers due their suitable properties. The extension of the working frequency required by a great variety of electrical drives imposed new challenges for this class of materials. Current researches aimed to increase material performances to be used in a broad frequency range. New measurement procedures and indicators are required. This paper deals with an analysis on measurement procedures of soft magnetic materials characteristics in variable magnetization regime, in order to establish the maximum frequency limit of use. Three types of electrical steel specimens with different thickness are analyzed. The effect of frequency on the magnetic characteristics and core losses, and thickness effect are established.