Determination of Parameters in the Universal Induction Motor Model

A systematic procedure to determine the parameters of a previously proposed low-to-high frequency induction motor model is presented. Analysis of the high-frequency behavior with regard to the impact of magnetic core selection, parasitic inter-turn and winding-to-frame capacitors, and skin effects of windings is investigated in greater detail for the proposed universal model of an induction motor. The model is universal in the sense that it is derived by extending the low frequency standard-T-equivalent circuit (IEEE Std. 112) to include high- frequency effects under both common-mode and differential- mode domains, and can be used for transient reflected wave studies and EMI emissions in motor drive systems. A test-based method and an analytical approach, respectively useful in application and design stages, is presented to determine the frequency characteristics of the induction motor. Findings of the investigation were verified experimentally with results presented in this paper.