Novel Iron Loss Modeling of the BLDC Motor for the Fuel Pump by Considering Non Sinusoidal Distributed Magnetic Flux Density Effect in the Stator Core

Abstract

This paper proposes a novel Iron loss model of the permanent magnet (PM) brushless dc (BLDC) motor. The novel iron loss model predicts the iron losses in the stator core of the BLDC motor. The novel iron loss model calculates more accurately the iron losses of the PM BLDC motor as compared to the earlier models. Also the novel iron loss model calculates the iron loss for the case of skewed stator teeth in the PM BLDC motor. The novel iron loss model calculates the hysteresis loss by considering the effect of minor hysteresis loops due to non sinusoidal flux density. The novel iron loss model calculates the eddy current loss and the excess eddy current loss in the tooth due to only normal component of flux density. The novel iron loss model calculates the eddy current and the excess eddy current loss in tooth due to normal component of flux density by considering the rate of change of flux density equal to one slot pitch. The novel model calculates the eddy current loss and the excess eddy current loss in the yoke due to both the components of flux density. The novel model calculates the eddy current loss and the excess eddy current loss in the yoke due to circumferential component of flux density by considering the rate of change of flux density is equal to the time required for the transversal of one magnet width. The novel model calculates the eddy current and the excess eddy current loss in yoke due to normal component of flux density for the rate of change of flux density equal to one slot pitch. Also the novel iron loss model calculates the eddy current loss and the excess eddy current loss in tooth when tooth is skewed, for the rate of change of flux density equal to one slot pitch. This paper presents an improved set of the models for calculation of the iron loss for the case of with and without skew in the PM BLDC motor. Finally prediction of the iron loss by the novel iron loss model is compared with the FEM results in this paper for the validity of the novel iron loss model.