Module 1 : Stability of Electric Drives
Steady State Stability of an Electric Drive
(Cont.)
Criteria for steady state stability:-
Let the equilibrium of the torques and speed is
and the small deviations are
After the displacement from the equilibrium state the torque equation becomes,
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Dr. K. R. Rajagopal
and the small deviations are 
After the displacement from the equilibrium state the torque equation
becomes,
