Calculation of Iron Loss in Soft Ferromagnetic Materials using Magnetic Circuit Model Taking Magnetic Hysteresis into Consideration

Abstract

The establishment of a simple and practical method of calculating iron loss, including magnetic hysteresis behavior, in electric machines has recently been required in order to develop highly efficient machines quickly and at low cost. A novel and practical method of calculating hysteresis behavior based on a magnetic circuit model incorporated with the Landau-Lifshitz-Gilbert (LLG) equation was proposed in a previous paper. The proposed method enabled highly accurate calculation of the hysteresis loops of conventional non-oriented Si steel under sinusoidal and pulse width modulation (PWM) wave excitations. In this paper, we prove the usefulness and versatility of the proposed method by reporting our recent calculations of the hysteresis loops of two other types of soft ferromagnetic materials (low-loss Si steel with thickness of 0.2 mm and an amorphous core). The calculated results were compared with those obtained from an experiment.