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It has been demonstrated clearly in the literature that saturation in electrical machines leads to a flux linkage between orthogonal axis windings. Hence this magnetic coupling should be included in the mathematical model for the (small signal) dynamic analysis of saturated machines. Obviously, in smooth air-gap machines the resulting incremental mutual inductances must be equal because of symmetry. I n salient-pole-type machines, however, the assumed saturation models do not settle the question whether the reciprocity property, which is well-known for linear inductors, is still valid for these saturated mutual inductances. I t is shown that the reciprocity property can be extended to these cases, provided the losses are either negligible or modeled separately (as is usual in machine analysis). As a corollary, a condition is derived for the self-inductances of the orthogonal windings so that the total magnetizing current can be used to characterize the saturation level in both axes.

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