For a salient-pole machine, the values of the inductances measured by the locked rotor test can lead to appreciable error if the windings produce mmf harmonics. In practice, the effects of winding harmonics cause considerable divergence from values of the ideal machines. In the case of a reluctance-synchronous machine, the discrepancy is even larger because the axis reactance ratio is higher than that of a conventional synchronous machine.In this paper, the amplitude of the second harmonic term of the self-inductance is defined to be independent of the corresponding amplitude of the mutual inductance, which represents the effects of space harmonics. Therefore, expressions for the direct-and quadrature-axis inductances of the machine with space harmonics can be derived only for three-phase machines.Inductance variations of several cageless reluctance-synchronous machines for high-speed drives were measured. Based on the results of the measurements, the direct-and quadrature-axis inductances are predicted using derived expressions. In addition, these are also predicted by the conventional method and compared with the machine parameters ohtained by the load tests. The proposed method is found to predict accurate machine parameters.
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