On the Hysteresis Losses Investigation for Rotational Core of a SMPM in Time-stepped FEA

 Hafedh Trabelsi and Ali Mansouri

Abstract
This paper deals with the modeling and computation of rotational hysteresis core losses in a rotating surface-mounted permanent magnet (SMPM) machine. Formulations of these losses taking into account the rotational behaviour of the magnetic field are developed. These formulations are used together with the time stepped finite element method to calculate the hysteresis core losses in the considered design according to the distribution of the rotating magnetic field. The originality of this work resides on the search of the optimum number of directions to be used for Vector Preisach model. This parameter has an interesting impact on the magnetic intensity value, and hence on the hysteresis loss value. So it seems significant to optimize this parameter by considering the two main criteria: (i) accurate estimation of the hysteresis iron losses, (ii) reasonable computation time. In a first step, the effect of the number of directions on the hysteresis loss term has been investigated. In a second step, the hysteresis losses, considering the optimum number of directions and the developed formulations have been investigated. The calculated results are discussed.

Keywords: magnetic hysteresis losses, rotating electrical machines, time-stepped finite element analysis.

(P1110741008, 906 KB)