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As part of EPRI Program RP 1288-1, Improvement in Accuracy of Prediction of Electrical Machine Constants, a method has been developed for calculating small-signal operational inductances. The method utilizes solutions to the magnetic diffusion equation, solved by the finite-element method. To faithfully simulate the behavior of the rotor iron for small-signal perturbations, measured values for incremental permeability are used.
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Dougherty et al. (1983) studied this question.
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