Analytical Modeling of PM Electrical Machines With Eccentric Surface-Inset Halbach Magnets

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Abstract
In this article, a linear analytical model has been proposed for solving and optimizing the magnetic fields in brushless permanent magnet (PM) electrical machines having eccentric surface-inset magnets. Using a subdomain model with an equivalently split method, on the basis of a linear superposition, the magnetic fields have been analytically obtained and optimized in the PM machines having the assumed linear materials with proposed eccentric surface-inset Halbach magnets. Moreover, the induced phase electromotive force and instantaneous electromagnetic torque have been also derived. Compared with the conventional and concentric Halbach surface-inset models, the optimized eccentric Halbach model exhibits good performances with the equal magnet volume. The prediction results of the linear analytical model are coincided with finite element analysis (FEA).
Funding Information
  • National Natural Science Foundation of China (51637001)
  • Anhui Provincial Natural Science Foundation (2008085ME179)
  • Higher Education Discipline Innovation Project (BP0719039)

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