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Energies 2018, 11(8), 2141; https://doi.org/10.3390/en11082141

Quantitative Comparisons of Six-Phase Outer-Rotor Permanent-Magnet Brushless Machines for Electric Vehicles

1
School of Energy and Environment, City University of Hong Kong, 83 Tat Chee Avenue, Kowloon Tong, Hong Kong, China
2
Research Laboratory of Electronics, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
*
Author to whom correspondence should be addressed.
Received: 20 July 2018 / Revised: 10 August 2018 / Accepted: 11 August 2018 / Published: 16 August 2018
(This article belongs to the Special Issue Permanent Magnet Synchronous Machines)
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Abstract

Multiphase machines have some distinct merits, including the high power density, high torque density, high efficiency and low torque ripple, etc. which can be beneficial for many industrial applications. This paper presents four different types of six-phase outer-rotor permanent-magnet (PM) brushless machines for electric vehicles (EVs), which include the inserted PM (IPM) type, surface PM (SPM) type, PM flux-switching (PMFS) type, and PM vernier (PMV) type. First, the design criteria and operation principle are compared and discussed. Then, their key characteristics are addressed and analyzed by using the finite element method (FEM). The results show that the PMV type is quite suitable for the direct-drive application for EVs with its high torque density and efficiency. Also, the IPM type is suitable for the indirect-drive application for EVs with its high power density and efficiency. View Full-Text
Keywords: permanent-magnet machine; brushless machine; Vernier machine; flux switching machine; multiphase machine; outer rotor; electric vehicle permanent-magnet machine; brushless machine; Vernier machine; flux switching machine; multiphase machine; outer rotor; electric vehicle
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Yao, Y.; Liu, C.; Lee, C.H. Quantitative Comparisons of Six-Phase Outer-Rotor Permanent-Magnet Brushless Machines for Electric Vehicles. Energies 2018, 11, 2141.

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