Discussion
Hunting in a synchronous motor is
Answer: D
Correct answer: oscillation of the rotor about its steady torque angle
Hunting is a swinging of the rotor about its equilibrium torque angle following a disturbance - a load step, a supply dip, or a pulsating load such as a reciprocating compressor. The rotor and the electromagnetic stiffness of the coupling form a lightly damped oscillator, and if the disturbance is periodic and near the natural frequency the swing can grow until synchronism is lost. Damper windings exist to suppress it.
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