Abstract
The requirement for electrical machines operating at extremely high temperatures has prompted researchers to focus on new materials. The use of nickel-coated copper (Cu/Ni) wires can be a promising alternative to copper wires because of their resistance to oxidation at high temperatures. In this article, the characterization of Cu/Ni wires' electrical resistance in the frequency domain as well as the measurement of pure nickel's B(H) curve have been specified. The effect of nickel coated on a copper wire is remarkable in terms of electrical resistance at high frequencies because of the skin effect and eddy currents. An original model has been proposed for the prediction of the electrical resistance. The originality is to consider the bimetallic conductor as a transformer in order to generate its model. Since the analytical calculation is not possible because of the nonlinearity of the nickel's magnetic properties, a new numerical computational method for the determination of the impedances was proposed. The modeling results are correlated with the experimental tests made on 3 Cu/Ni wires: 0.3 mm diameter with 27% of nickel in volume and 0.5 mm diameter with 8 and 18 μm nickel thickness. This article, thus, provides essential information about the important parameters for the performance of electrical machines.
Published Version
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