What are the function of damper winding?

The function of the damper winding in the synchronous generator is to suppress the negative sequence field and to dampen oscillation whereas it is used to provide starting torque and reduce effect of hunting to some extent in the synchronous motor.

Why are damper winding used in the construction of hydrogen generator?

Why are damper windings used in the construction of hydro-generators? Explanation: The damper windings are generally used in the construction of hydro-generators. It is generally used to reduce the oscillations in the generator. 11.

How does damper winding prevent hunting?

Damper winding damps out hunting by producing torque opposite to slip of rotor. The magnitude of damping torque is proportional to the slip speed. This increases the inertia of prime mover and helps in maintaining the rotor speed constant.

What happens if the field winding of the synchronous motor with damper winding is short-circuited?

In the case of an induction motor, the field winding is permanently short-circuited by end rings. In a Synchronous motor, the rotor winding is supplied with DC excitation. Therefore if we short circuit the field winding of a synchronous motor then it will behave as an induction motor.

What is a damper winding generator?

The damper winding is used to reduce the winding oscillation. Damper winding in an alternator is also known as squirrel-cage winding. This winding is located inside the slotted pole shoes of the alternator.

What is damping in synchronous machine?

synchronous motors usually referred to as a damper winding because of its additional property of damping out any oscillation that might be caused by sudden changes in the load on the rotor when in synchronism. Adjustment to load changes involves changes in the angle by which the rotor field lags the stator…

When a synchronous motor is running at synchronous speed the damper winding produces?

Zero torque
The damping winding produces Zero torque when a synchronous motor is running at synchronous speed.

How damper winding in the rotor of the synchronous motor makes it self starting?

Synchronous motor is not self starting but the damper winding makes it self starting. When three phase supply is given to stator of synchronous motor it produce rotating magnetic field. This rotating magnetic field links with the damper windings and motor will start as a three phase induction motor.

What is damping in synchronous generator?

Definition of damper winding : a short-circuited squirrel-cage winding placed in the pole faces and around the pole shoes of synchronous machines, the currents induced in the winding by the periodic variations in synchronous speed having the effect of a damper. — called also amortisseur.

How is damper winding used to reduce hunting?

Use of Damper Winding: It consists of low electrical resistance copper / aluminum brush embedded in slots of pole faces in salient pole machine. Damper winding damps out hunting by producing torque opposite to slip of rotor. This increases the inertia of prime mover and helps in maintaining the rotor speed constant.

What determines the speed control of a synchronous motor?

The speed of a synchronous motor is dependent on the frequency of the power source and the number of poles the stator has. RPM increases directly with frequency and inversely as the number of poles.

What is the function of damper windings in synchronous motor?

Damper windings in synchronous motor will carryout the same task of induction motor rotor windings. Therefore due to damper windings synchronous motor starts as induction motor and continue to accelerate).

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.

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.

What happens when a synchronous motor is connected to DC?

So, initially, the synchronous motor will start as an induction motor and it will continue running after giving the auxiliary DC supply to the main field winding. When the rotor catches the synchronous speed there will be no relative speed between the stator and rotor and the damper winding will stop inducing emf.