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Energies 2016, 9(11), 892; doi:10.3390/en9110892

Analytical Modeling of Static Eccentricities in Axial Flux Permanent-Magnet Machines with Concentrated Windings

1
Engineering Research Center for Motion Control of Ministry of Education, Southeast University, Nanjing 210096, China
2
Department of Electrical Energy, Systems and Automation, Ghent University, Ghent B-9000, Belgium
*
Author to whom correspondence should be addressed.
Academic Editor: K.T. Chau
Received: 7 July 2016 / Revised: 23 October 2016 / Accepted: 24 October 2016 / Published: 29 October 2016
(This article belongs to the Collection Electric and Hybrid Vehicles Collection)

Abstract

The aim of this paper is to calculate the static eccentricity (SE) of a double rotor axial flux permanent magnet (AFPM) machine by using a general analytical model. The flux density in the air gap under healthy conditions is calculated firstly, where the axial and circumferential magnetic flux densities are obtained using a coupled solution of Maxwell’s equations and Schwarz-Christoffel (SC) mapping. The magnetic flux densities under SE conditions are calculated afterwards using a novel bilinear mapping. Some important electromagnetic parameters, e.g., back electromotive force (EMF), cogging torque and electromagnetic (EM) torque, are calculated for both SE and healthy conditions, and compared with the finite element (FE) model. As for the double rotor AFPM, SE does not contribute much effect on the back EMF and EM torque, while the cogging torque is increased. At each calculated section, FE models were built to validate the analytical model. The results show that the analytical predictions agree well with the FE results. Finally, the results of analytical model are verified via experimental results. View Full-Text
Keywords: analytical model; axial flux permanent magnet (AFPM) machines; back electromotive force (EMF); conformal mapping (CM); double rotor; static eccentricity (SE); Finite element (FE) model; torque analytical model; axial flux permanent magnet (AFPM) machines; back electromotive force (EMF); conformal mapping (CM); double rotor; static eccentricity (SE); Finite element (FE) model; torque
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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

Huang, Y.; Guo, B.; Hemeida, A.; Sergeant, P. Analytical Modeling of Static Eccentricities in Axial Flux Permanent-Magnet Machines with Concentrated Windings. Energies 2016, 9, 892.

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