Abstract
D-decomposition technique is used to determine the stability/instability regions of a variable frequency induction motor. The technique is more simple, straightforward and elegant when compared to the conventional classical methods like root locus technique, Nyquist criterion and Routh-Hurwitz criterion. The machine equations are used in Park's vector notation which reduces the order of the system equation to three. The equation, however contains complex coefficients. The linearised model based on small displacements is used in the stability analysis to investigate the effects of variation of machine parameters such as stator and rotor resistances, leakage reactances etc. on the stability regions of the motor.
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