Table of Contents
What is the purpose of damper in a synchronous generator?
Damper Winding: A synchronous motor has no self-starting torque. Therefore, damper winding provides starting torque necessary for starting the synchronous motor. It also prevents hunting of synchronous motor, that is it reduces oscillations of the rotor when the motor deviates from synchronism.
What is the use of damper winding Mcq?
The function of damper winding in synchronous motor: Therefore, damper winding provides starting torque necessary for starting of the synchronous motor. It also prevents hunting of synchronous motor, that is it reduces oscillations of the rotor when the motor deviates from synchronism.
When synchronous motor is running at synchronous speed damper winding produces?
The damping winding produces _______ when a synchronous motor is running at synchronous speed.
Which rotor is used in synchronous motor?
Cylindrical, round rotors, (also known as non salient pole rotor) are used for up to six poles. In some machines or when a large number of poles are needed, a salient pole rotor is used. The construction of synchronous motor is similar to that of a synchronous alternator.
What is the synchronous speed of a motor?
The synchronous speed is the speed of the revolution of the magnetic field in the stator winding of the motor. It is the speed at which the electromotive force is produced by the alternating machine.
What are the functions of damper windings in a synchronous motor?
Functions of Damper Windings: By providing damper windings in the rotor of synchronous motor “Hunting of machine”can be suppressed.When there is change in load, excitation or change in other conditions of the systems rotor of the synchronous motor will oscillate to and fro about an equilibrium position.
How hunting of machine can be suppressed by damper windings?
By providing damper windings in the rotor of synchronous motor “Hunting of machine”can be suppressed.When there is change in load, excitation or change in other conditions of the systems rotor of the synchronous motor will oscillate to and fro about an equilibrium position.
How does a synchronous motor work?
The exciter for synchronous motor moves along with rotor. When the motor attains about 95\% of the synchronous speed, the rotor windings is connected to exciter terminals and the rotor is magnetically locked by the rotating magnetic field of stator and it runs as a synchronous motor.
Why induced emf in the damper winding of synchronous machine is zero?
When the rotor is rotating at synchronous speed, then the relative velocity between the RMF (rotating magnetic field of the stator) and the rotor is zero. Hence induced EMF in the damper winding is zero. Thus, under normal running conditions, damper winding in synchronous machine does not carry any current.