a, phase current and q-axis current component ( iql) of the 3-
phase windings YI respectively, when the given speed is
changing at f = 0.5Hz.
It’s seen fiom Fig. 3, Fig. 4 and Fig. 5 that the waveforms of two models are completely the same when the input is
constant or changing slowly. It shows that the equivalent
circuit model is correct and practical for steady-state and
quasi-steady-state. analysis.