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Damper windings:-
Most of the alternators have their pole-shoes slotted for receiving copper bars of a grid or damper winding (also known as squirrel- cage winding).the copper bars are short-circuited at both ends heavy copper rings. these dampers are useful in preventing the hunting9momentary speed fluctuations) in generators and needed in synchronous motors to provide the starting torque. Turbo- generators usually do not have these damper windings(except in special case to assist in synchronizing) because the solid field-poles themselves act as efficient dampers. It should be clearly understood that under normal running conditions, damper winding does not carry any current because rotor runs at synchronous speed.
The damper winding also tents to maintain balanced 3-phase voltage under unbalanced load conditions.
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What are damper winding?
damper winding help to maintain the magnitude phase shift (on load chages) between rotor an stator flux and kill some parasite currents produced by the leakage flux moving out the rotor winding to the rotor core.
When will a synchornous motor acts as an induction motor?
If there is an extra winding called the "damper winding" in addition to the field winding.Then the synchronous motor will operate as a squirrel cage induction motor.Whats is a damper winding ?A damper winding is made up of copper bars which are placed in the slots in the pole faces of the rotor.These are short circuited with the help of end rings in a squirrel cage induction motor.
Discuss why the damper winding are not used in turbo generator?
It is definitely used in a turbo-generator
What is the primary function of alternators?
The primary function of alternators is to generate electricity to recharge a car battery. The alternator recharges the battery while the car is being used.
What is the function of winding in motor?
because its winding follows the wave sign
What is the function of armature winding?
The winding function of an electric motor is a description of how the number of conductors in the windings around the motor changes with position.
Why alternators constructed with stationary Ac winding and rotating pole?
To eliminate the requirement for slip rings and brushes to handle the large voltage/current involved.
What are the uses of damper winding s in synchronous motor?
to achive constant speed and provide a eassy way to inter loacking with syn fluxDamper winding is a short circuited winding which are useful in preventing the hunting(momentary) speed fluctuation in alternator and are needed in synchronous motor to provide starting torque.
What is the function of damper?
used to adjust the volume of rates of flow to the desired quantity.
How is the synchronous motor made self starting?
The synchronous motor is made self starting by providing a special winding on the rotor poles, known as damper winding or squirrel cage winding. AC supply given to the stator produces a rotating magnetic field which causes the rotor to rotate, therefore, in the beginning synchronous motor provided with damper winding starts as a squirrel cage induction motor. The exciter moves along the rotor. When the motor attains about 95%of synchronous speed, the rotor winding is connected to exciter terminals and the rotor is magnetically locked by the rotating field of the stator and the motor runs as a synchronous motor. While starting a synchronous motor, the field winding must be shorted through a suitable resistance so that the induced voltage is distributed throughout the whole winding and no part is subjected to the high voltage induced in the entire winding.
Is there any other method of damping the oscillation in a synchronous motor other than using damper winding and if yes what is it?
In synchronous motor hunting can be minimized using flywheel to the shaft .
Does the primary winding VA equal the secondary winding VA when a transformer is loaded?
no becouse transformer function depends on no of coil in primary and secondry coil
