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Article Dans Une Revue Progress In Electromagnetics Research B Année : 2009

Discussion about the magnetic field produced by cylindrical halbach structures

Résumé

This paper uses a three-dimensional analytical approach based on the Coulombian model for studying the magnetic field produced by cylindrical Halbach structures. Such structures, commonly used in magnetic couplings or in electrical machines, are composed of tile permanent magnets with rotating magnetizations. Such assemblies of tile permanent magnets allow one to optimize easily the radial field shape in the air gap of electrical machines. In addition, Halbach structures can be used in magnetic couplings for improving the torque transmitted between the two rotors. Analytical studies dealing with the optimization of such structures generally use a two-dimensional analytical approach for calculating either the magnetic field produced by tile permanent magnets or the forces exerted between them. These two-dimensional expressions are useful because they have a very low computational cost. However, their accuracy depends greatly on the structure dimensions. We propose in this paper to use a three-dimensional analytical model based on the Coulombian model for determining the exact shape of the magnetic field produced by a halbach structure. Such an approach also allows one to determine the demagnetizing magnetic field inside the tile permanent magnets. This element of information is important for the design of tile permanent magnets.
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Dates et versions

hal-00365870 , version 1 (09-03-2009)

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Romain Ravaud, Guy Lemarquand. Discussion about the magnetic field produced by cylindrical halbach structures. Progress In Electromagnetics Research B, 2009, 13, pp.275-308. ⟨10.2528/PIERB09012004⟩. ⟨hal-00365870⟩
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