Quantitative Comparisons of Outer-Rotor Permanent Magnet Machines of Different Structures/Phases for In-Wheel Electrical Vehicle Application

Jinlin Gong (), Benteng Zhao, Youxi Huang, Eric Semail and Ngac Ky Nguyen
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Jinlin Gong: School of Electrical Engineering, Shandong University, Jinan 250061, China
Benteng Zhao: School of Electrical Engineering, Shandong University, Jinan 250061, China
Youxi Huang: School of Electrical Engineering, Shandong University, Jinan 250061, China
Eric Semail: Laboratory of Electrical Engineering and Power Electronics of Lille (L2ep), Arts et Métiers, 59043 Lille, France
Ngac Ky Nguyen: Laboratory of Electrical Engineering and Power Electronics of Lille (L2ep), Arts et Métiers, 59043 Lille, France

Energies, 2022, vol. 15, issue 18, 1-19

Abstract: As one of the key components, low-speed direct-drive in-wheel machines with high compact volume and high torque density are important for the traction system of electric vehicles (EVs). This paper introduces four different types of outer-rotor permanent magnet motors for EVs, including one five-phase SPM machine, one three-phase IPM machine with V-shaped PMs, one seven-phase axial flux machine (AFM) of sandwich structure and finally one hybrid flux (radial and axial) machine with a third rotor with V-shaped PMs added to the AFM. Firstly, the design criteria and basic operation principle are compared and discussed. Then, the key properties are analyzed using the Finite Element Method (FEM). The electromagnetic properties of the four fractional slot tooth concentrated winding in-wheel motors with similar dimensions are quantitatively compared, including air-gap flux density, electromotive force, field weakening capability, torque density, losses, and fault tolerant capability. The results show that the multi-phase motors have high torque density and high fault tolerance and are suitable for direct drive applications in EVs.

Keywords: permanent magnet machine; SPM machine; IPM machine; axial flux machine; hybrid flux machine; multiphase machine; outer-rotor; electric vehicle (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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