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Eigenvalue Loci of Small Signal Stability in Induction Motor

Nader barsoum

This paper presents new loci of the eigenvalue which obtained from the characteristic equation of induction machine model represented in synchronous flux wave reference frame, which is time invariant frame. It discusses the inherent instability when the motor shaft is excited by small forced oscillation, and shows the analysis and the form of the dominant mode and the mode of causing the instability in the whole range of operating conditions. Stability analysis is investigated from the perturbation variables which relate to small signal model, and the eigenvalue loci is given by varying the important machine parameters within the range of operation.