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Electromagnetic design of axial-flux permanent magnet machines.

Bumby, J. R. and Martin, R. and Mueller, M. A. and Spooner, E. and Brown, N. L. and Chalmers, B. J. (2004) 'Electromagnetic design of axial-flux permanent magnet machines.', IEE proceedings : electric power applications., 151 (2). pp. 151-160.


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.

Item Type:Article
Additional Information:This paper is a postprint of a paper submitted to and accepted for publication in [IEE proceedings : electric power applications.] and is subject to Institution of Electrical Engineers Copyright. The copy of record is available at IET Digital Library.
Keywords:Generator, Torus.
Full text:Full text not available from this repository.
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Record Created:23 Apr 2008
Last Modified:08 Apr 2009 16:20

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