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Energies 2014, 7(12), 8056-8075; doi:10.3390/en7128056

Influence of Different Rotor Teeth Shapes on the Performance of Flux Switching Permanent Magnet Machines Used for Electric Vehicles

School of Automation, Beijing Institute of Technology, Beijing 100081, China
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Received: 10 October 2014 / Revised: 12 November 2014 / Accepted: 24 November 2014 / Published: 1 December 2014

Abstract

This paper investigated a 12-slot/11-pole flux switching permanent magnet (FSPM) machine used for electric vehicles (EVs). Five novel rotor teeth shapes are proposed and researched to reduce the cogging torque and torque ripple of the FSPM machine. These rotor teeth shapes are notched teeth, stepped teeth, eccentric teeth, combination of notched and stepped teeth, and combination of notched and eccentric teeth. They are applied on the rotor and optimized, respectively. The influences of different rotor teeth shapes on cogging torque, torque ripple and electromagnetic torque are analyzed by the 2-D finite-element method (FEM). Then, the performance of FSPMs with different rotor teeth shapes are compared and evaluated comprehensively from the points of view of cogging torque, torque ripple, electromagnetic torque, flux linkage, back electromotive force (EMF), and so on. The results show that the presented rotor teeth shapes, especially the combination of stepped and notched teeth, can greatly reduce the cogging torque and torque ripple with only slight changes in the average electromagnetic torque. View Full-Text
Keywords: flux switching permanent magnet (FSPM) machine; cogging torque; torque ripple; notched teeth; stepped teeth; eccentric teeth flux switching permanent magnet (FSPM) machine; cogging torque; torque ripple; notched teeth; stepped teeth; eccentric teeth
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Zhao, J.; Yan, Y.; Li, B.; Liu, X.; Chen, Z. Influence of Different Rotor Teeth Shapes on the Performance of Flux Switching Permanent Magnet Machines Used for Electric Vehicles. Energies 2014, 7, 8056-8075.

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