Analysis of Magnet Shape Effect on Cogging Torque and EMF Waveform of AFPM Generators Using FEM Methods

Authors

Faculty of Electrical and Computer Engineering, University of Tabriz, Tabriz, Iran

Abstract

Axial flux permanent magnet machines (AFPMs) have a higher cogging torque than their radial flux counterparts. Power density, cogging torque, torque-speed characteristics, and the efficiency are the most important parameters in the design of the generators. This study aims to investigate the effects of the rotor magnets deviations which reduce the cogging torque and influence the performance of the AFPM generators. Therefore, the effects of these deviations are thoroughly studied through finite element analysis of a nine-phase single-stator single-rotor AFPM generator.  FLUX 11.2 and the finite element method are jointly used to analyze this generator. The simulations are conducted under no load and full load conditions. The results show that with an optimal deviation in the rotor magnet shapes, an almost sinusoidal Electro- Motive- Force (EMF) can be obtained. In addition, reducing the cogging torque leads to output torque ripple reduction. Therefore, the current waveforms are improved.

Keywords

TABRIZ JOURNAL OF ELECTRICAL ENGINEERING
Volume 47, Issue 3 - Serial Number 81
November 2017
Pages 1147-1159

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