Abstract
The transient performance of three-phase heteropolar inductor alternators under sudden 3-phase short-circuit is presented in this paper. Lewis's transformation8 is utilized to formulate the basic differential equations of the alternator in terms of self-and mutual inductances. The inductor alternators with equal slot and tooth width of the rotor behave like cylindrical rotor synchronous machines, whereas those with unequal slot and tooth width of the rotor are similar to salient-pole machines. The transient reactance and time constants greatly depend on the ratio of the fundamental component of permeance variation to average permeance.
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