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Recently the rare-earth magnet NdFeB is applied to a magnet motor of electric vehicles. The rise of temperature due to eddy current loss in the PM (Permanent Magnet) leads to serious deterioration of ...the PM, especially in high speed operation. In general NdFeB is coated with Ni (Nickel) or Al (Aluminum) in order to prevent from corrosion and destruction. PM coating is very thin, but conductivity of coating material is much larger than that of PM, and Ni is the magnetic material. Consequently, PM coating has an influence on the eddy currents in PM. This paper presents the finite element analysis of eddy currents in coated PM of surface-mounted-PM SM (Synchronous Motor), and makes clear an influence of Al- and Ni-coating.show more
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