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The simplicity of the machine equations in their two-axis form depends upon a certain relation between the inductance coefficients being satisfied. The condition is likely to be fulfilled in a machine having a uniform air-gap, but in a salient-pole machine its fulfilment is open to doubt. The paper contains a theoretical and experimental study of the question: the experimental aspect has required the development of new methods of measuring the machine constants.
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Carter et al. (1961) studied this question.
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