The d-axis inductance of reluctance motor is affected by not only the d-axis current but also the q-axis current, because of cross magnetic saturation between the direct and quadrature axes. This situation is similar for the q-axis inductance. The authors propose a method to determine the d-axis inductance related to the d- and q-axis currents and the q-axis inductance related to the d- and q-axis currents from a standstill test. This method involves the following four steps. First a rectangular-wave voltage, alternated between plus and minus, is applied to the two armature winding terminals after braking the rotor in the d-axis position. Secondly the voltage and current between the terminals are measured. Thirdly the d-axis inductance related with d-axis current is calculated from the voltage and current. Finally the process above is repeated when a DC current flows from the remaining armature terminal to neutral point terminal and the d-axis inductance related to the d- and q-axis currents is derived. A similar treatment applies when determining the q-axis inductance related to the d-and q-axis currents in the q-axis rotor position. The method is implemented on a 1.1kW-178V- 6.3A-4P-2200min-1 flux barrier type reluctance motor. Results of load performance on a vector controlled reluctance motor measured by on-load tests and calculated from the d- and q-axis inductances obtained by the proposed method clearly demonstrate the validity of the proposed method.
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Yamamoto et al. (2003) studied this question.
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