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Energies 2015, 8(3), 1663-1684; doi:10.3390/en8031663

Research on an Axial Flux PMSM with Radially Sliding Permanent Magnets

1
School of Automation, Beijing Institute of Technology, Beijing 100081, China
2
School of Electrical Engineering and Automation, Harbin Institute of Technology, Harbin 150080, China
*
Author to whom correspondence should be addressed.
Academic Editor: Omar Hegazy
Received: 26 December 2014 / Revised: 6 February 2015 / Accepted: 15 February 2015 / Published: 27 February 2015
(This article belongs to the Special Issue Advances in Plug-in Hybrid Vehicles and Hybrid Vehicles)

Abstract

Axial flux permanent-magnet synchronous machines (PMSMs) are very suitable candidates for the power train of electric vehicles (EVs) due to high power density and high efficiency. This paper researches an axial flux PMSM with radially sliding permanent magnets (PMs) to fulfill field-weakening control. The field weakening principle and the structure of this kind of axial flux PMSM by mechanical method of sliding PMs are proposed and analyzed. The influences of radially sliding PMs on magnetic flux density distribution, inductance, flux linkage and torque are analyzed and discussed based on 3D finite element method (FEM). The field weakening capabilities by mechanical method and electrical method are compared. The field weakening capability of the machine can be much improved by the optimized combination of the two methods, which is very satisfying for EV drive application. The forces on the PMs are analyzed and calculated. The hysteretic characteristics caused by the friction of the PMs are investigated, which provide useful reference for designing this kind of machine. View Full-Text
Keywords: axial flux; permanent magnet synchronous machine (PMSM); sliding permanent magnets; field weakening; inductance; hysteretic characteristic axial flux; permanent magnet synchronous machine (PMSM); sliding permanent magnets; field weakening; inductance; hysteretic characteristic
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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.; Li, B.; Gu, Z. Research on an Axial Flux PMSM with Radially Sliding Permanent Magnets. Energies 2015, 8, 1663-1684.

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