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In a synchronous motor, during hunting when the rotor speed exceeds the synchronous speed then damper bar develop
Induction generator torque
Harmonic
DC motor torque
Synchronous motor torque
Induction generator torque
In a synchronous motor, when hunting occurs and the rotor speed exceeds synchronous speed, the damper bars develop induction generator torque. This torque opposes the increase in speed, stabilizing the rotor position.
In a synchronous motor, when hunting occurs and the rotor speed exceeds synchronous speed, the damper bars develop induction generator torque. This torque opposes the increase in speed, stabilizing the rotor position.
PgenтАЛ=RE2тАЛ тАФ Induction generator power
T=╧ЙPтАЛ тАФ Torque equation
The induction generator torque arises because the rotor slips into the generating mode when it exceeds the synchronous speed. The damper bars, which are usually equipped with squirrel cage windings, begin to induce currents that produce a torque opposite to the rotor's motion, thus acting to bring the rotor speed back down to synchronous speed.
Hunting in synchronous motors can destabilize operation.
Damper bars help counteract excessive speed and stabilize the motor.
Enhanced stability during dynamic conditions.
Reduced chances of overspeed operation.
Potential for increased wear on damping components.
Complex control requirements in high-load scenarios.
Wind turbines where synchronous generators are used.
Industrial applications requiring steady torque.
The damper bars are essential in preventing oscillations during load changes.
Option B is incorrect as harmonics relate to frequency variations, not torque.
A is correct тАФ Induction generator torque develops when the rotor exceeds synchronous speed, acting to stabilize system performance.
Understanding the interaction between speed and torque in rotating machines is crucial for effective motor control.