The voltage and torque equations of induction motor during hunting are formulated at first, then the asynchronous and damping torque coefficients are derived.

Hunting Hunting is a phenomenon that can occur upon load changes in which the frequency or the voltage continues to rise above and fall below the desired value without reaching a steady-state value.

Voltage regulation includes two fields: one is voltage rise near the end of the feeder: another is the tap hunting phenomenon of tap change under load (TCUL) transformers.