Comparative study of alternative modular switched flux permanent magnet machines

Author

Taras, P. ; Li, G.J. ; Zhu, Z.Q.

Author_Institution

Dept. of Electron. & Electr. Eng., Univ. of Sheffield, Sheffield, UK

fYear

2015

fDate

17-19 March 2015

Firstpage

658

Lastpage

663

Abstract

The electromagnetic performance of alternative single layer modular switched flux permanent magnet (SFPM) machines, i.e. conventional, C-core, E-core and modular, is compared by finite element analysis in this paper. The comparison includes winding factor, open-circuit flux density, back-EMF and electromagnetic torque, together with the influence of four slot/pole number combinations (12s/10p, 12s/11p, 12s/13p and 12s/14p). It is found that with flux gap the electromagnetic performance of modular SFPMMs does not necessarily degrade. The flux focusing and defocusing effects are observed in the C-core and some of the E-core machines. However, the flux defocusing effect occurs in all modular machines with large flux gap openings. Since the flux gap opening affects the slot area, the copper loss will be changed as well. Hence, the variation of copper loss against flux gap opening for the same current or the same torque has also been investigated.

Keywords

finite element analysis; permanent magnet machines; SFPM machines; alternative modular switched flux permanent magnet machines; back-EMF; copper loss; e-core machines; electromagnetic performance; electromagnetic torque; finite element analysis; flux defocusing effect; flux gap; open-circuit flux density; winding factor; Copper; Magnetic flux; Stator windings; Topology; Torque; Windings; finite element; flux focusing; modular machines; permanent magnet; single layer; switched flux;

fLanguage

English

Publisher

ieee

Conference_Titel

Industrial Technology (ICIT), 2015 IEEE International Conference on

Conference_Location

Seville

Type

conf

DOI

10.1109/ICIT.2015.7125173

Filename

7125173