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This paper verifies the influences of magnetic saturation of main flux for the mass-produced induction machine (IM) with closed rotor slot on impedance characteristics using high frequency voltage signal injection techniques. The high frequency signal is injected on the estimated flux axes via the high frequency signal injection axis. The impedance characteristics are evaluated by measuring the high frequency impedance in the case of changing the high frequency signal injection axis. The high frequency impedance is measured from the amplitude ratios of high frequency voltage to the current. The high frequency signal is extracted by utilizing Fast Fourier Transform (FFT) analysis. The test IM is driven with an ideal voltage source, and this system is mechanically coupled to the load machine via torque measuring equipment. The impedance characteristics are investigated in operation at low speed, regenerative and zero stator frequency by using the experimental system. As the measurement results, the change of the saliency position of the main flux saturation is clarified from the impedance characteristics. Also, the results of the impedance characteristics in the case of a load test at locked rotor condition are shown, and the difference of the impedance characteristics is clarified.
Inspec keywords: stators; asynchronous machines; electric impedance measurement; rotors; magnetic flux; fast Fourier transforms
Subjects: Impedance and admittance measurement; Integral transforms; Asynchronous machines