Affiliations: [a] Engineering Research Center for Motion Control of Ministry of Education, Southeast University, Nanjing 210096, Jiangsu, China | [b] School of Electrical, Mechanical and Mechatronic Systems, University of Technology Sydney, Sydney, Australia | [c] Department of Electrical Energy, Systems and Automation, Ghent University, Ghent B-9000, Belgium
Correspondence:
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Corresponding author: Baocheng Guo, Engineering Research Center for Motion Control of Ministry of Education, Southeast University, Nanjing 210096, Jiangsu, China. Tel.: +86 15005145661; E-mail:gbc_guo@seu.edu.cn
Abstract: In this paper, an analytical quasi three-dimensional
method is used to model an axial flux permanent magnet (AFPM) machine with
various eccentricities. AFPM machines (AFPMMs) have various advantages but
they are sensitive to geometrical imperfections for manufacturing aspect.
The main aim of this paper is to propose a general analytical model to
analyze the AFPMMs with various types of eccentricities. The radial and
tangential magnetic flux densities in the air gap under healthy condition
are obtained via combination of Maxwell's equations and Schwarz-Christoffel
(SC) mapping firstly. Next, in order to investigate the eccentricities,
equations for air gap length and radii are deduced. The back electromotive
force (EMF) is calculated and compared with those from healthy condition and
finite element (FE) analysis, respectively. The results show that the
analytical predictions agree well with the FE results. Moreover, using this
method has a significantly less time consuming than the 3D FM simulation
process, which is a great advantage of this method. Finally, the analytical
model is verified via experimental results.
