Application of the surface‐current method to the analysis of saturated electromagnetic devices

Abstract

This paper deals with the application of the surface-current method to the analysis of electromagnetic devices. The basics of the method are outlined and new developments involving the implementation of automated procedures for the definition of the geometry and sources, the contour subdivision according to suitable error indexes and the upgrading of the magnetic permeability to analyse saturated devices are described. As examples of application, the method is applied to the analysis of a single-phase step motor and a linear brushless DC motor; the results are discussed and compared with the outputs of corresponding finite-element method analyses.

Optimization of magnetic devices using Surface Current Method (SCM)

“…Number SCM and FEM elements. nent magnet step motor, which is illustrated in Figure 16(a) [6]. The relative permeability of stator is 4000, and the rotor is made of a cylindrical permanent magnet with rec = 0 and H c = 820 kA/m.…”

“…In this situation, because of high-calculation resources and a large number of iterations, the time consumption will be high enough, and so FEM would not be suitable for pre-elementary or optimization process. The Surface Current Method (SCM) is a candidate one for this application in magnetic optimization, especially in power engineering eld [4][5][6]. Because of easy management of the geometric con guration and simpli ed interface with external procedures, SCM can be used for such a purpose.…”

“…The lack of SCM is analysis of the magnetic devices with variable permeability (saturation e ect). In [6], two methods of considering saturation e ect have been reported, but these techniques are not general and do not present a unique and complete inside object subdivision method for permeability calculation. In other words, none of the two techniques has not presented general identifying roles to select inside sampling points.…”

“…The unknown surface currents are computed by imposing the validation of the tangential magnetic ux density refraction law on each element of magnetic interface [6], expressed in Eq. (2).…”

Electrical and Magnetic Circuit Coupling Using Surface Current Method

“…magnetic calculation in magnetic field and post processing [3]. Two methods for nonlinear analysis using SCM are -, , proposed [4]. Automated contour refinement of SCM was real(jr1) developed for increase calculation accuracy.…”