Abstract
This paper presents methods to determine the operational impedance of rotating machines by Fourier transformation of the voltage and current measured when a step (or pulse) voltage is applied to the two stator winding terminals. These standstill tests using a small-capacity DC power supply unit are tentatively termed DC testing methods. We also describe in detail the case using a DC power source with ripple and the case in which a step (or pulse) voltage is applied with current flowing. These methods are applied to a 5.5-kW squirrel-cage induction motor having semiclosed rotor slots. The validity of the proposed prediction methods is demonstrated by comparing the calculated and measured speed characteristics of the tested induction machine. © 2004 Wiley Periodicals, Inc. Electr Eng Jpn, 147(4): 51–59, 2004; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/eej.10348
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