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Electromagnetic design of axial-flux permanent magnet machines

Bumby, J.R.; Martin, R.; Mueller, M.A.; Spooner, E.; Brown, N.L.; Chalmers, B.J.

Authors

J.R. Bumby

R. Martin

M.A. Mueller

E. Spooner

N.L. Brown

B.J. Chalmers



Abstract

A general, analytic approach to the calculation of magnet fields in a slottless, axial-flux, permanent magnet generator is presented. The basic 'building block' is the vector potential produced by a current sheet situated between two, infinitely permeable, iron surfaces. By modelling the magnet by currents at its periphery, and integrating over the magnet thickness, the vector potential and magnetic field due to the permanent magnets can be found. In contrast the armature winding is represented by a current sheet close to the stator iron surface. Magnetic field results produced by the analytic equations have been compared with two-, and three-, dimensional finite element studies and found to produce results comparable to within 5%. In addition emf, flux and inductance measurements have been made on two generators and compared with both finite element and analytic results. The analytic model predicts the emf to within 5%. The 'end winding' inductance of a toroidal, air-gap, armature winding, is shown to contribute significantly to the overall inductance with the analytical model predicting the inductance to within 10% of the measured values.

Citation

Bumby, J., Martin, R., Mueller, M., Spooner, E., Brown, N., & Chalmers, B. (2004). Electromagnetic design of axial-flux permanent magnet machines. IEE proceedings. Electric power applications, 151(2), 151-160. https://doi.org/10.1049/ip-epa%3A20031063

Journal Article Type Article
Publication Date 2004-03
Deposit Date Apr 23, 2008
Journal IEE proceedings. Electric power applications.
Print ISSN 1350-2352
Electronic ISSN 1359-7043
Publisher IET
Peer Reviewed Peer Reviewed
Volume 151
Issue 2
Pages 151-160
DOI https://doi.org/10.1049/ip-epa%3A20031063
Keywords Generator, Torus.