Demagnetisation analysis for Halbach array configurations in electrical machines
Galea, Michael and Papini, Luca and Zhang, He and Gerada, C. and Hamiti, Tahar (2015) Demagnetisation analysis for Halbach array configurations in electrical machines. IEEE Transactions on Magnetics, 51 (9). ISSN 0018-9464
This paper proposes and investigates an analytical method for assessing the risk of potential, irreversible demagnetisation in the PMs of electrical machines, equipped with n-stages, Halbach arrays. The higher risk of demagnetisation, synonymous with Halbach arrays imposes that the method be both load and temperature dependant. In fact, the proposed method studies the magnetic field distribution in the air-gap and PM region, for various operating temperatures and expresses these fields as analytical expressions for the no-load and peak load conditions. The model can cater for Halbach arrays with up to n stages, thus making it a versatile tool that can be utilised for various Halbach configurations. Finite element analysis is used to validate the method.
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