This paper compares two impedance based methods used to determine magnetically nonlinera characteristics of an iron core inductor. Tested inductor is supplied from a sinusoidal voltage source. The ...inductor voltage and current are measured. In the first method, Fourier analysis is performed in order to determine only fundamental harmonic components of measured voltage and current. In the second method, an equivalent fundamental harmonic component current is defined. It has the same effective (RMS) value and produces the same averaged power as the measured current [1]. In both methods,the fundamental harmonic component current and voltage are used to calculate current dependent impedance, inductance and flux linkage. The obtained current dependent characteristics of flux linkages are compared with those determined by numerical integration of measured currents and voltages [2].
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