Abstract
This paper investigates influences on impedance characteristics for magnetic saturations of main and leakage fluxes. The demonstrated impedance characteristics will promote effective use of sensor-less vector control systems of an induction machine (IM) with high frequency voltage signal injections. The IM is driven with an ideal voltage source, and the impedances are evaluated in operation at no-load and various load conditions. The impedances for high frequency components are measured from the amplitude ratios of high frequency voltage to the current, and their high frequency components are extracted using Fast Fourier Transform (FFT) analysis. As a result, the main flux saturation saliencies are obtained under the conditions of high frequency and high voltage levels, and the leakage flux saturation saliencies are obtained under the conditions of high frequency and low voltage levels. In addition, the locus of the leakage flux saturation position change under various load conditions are clarified.
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