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The windings behave in the same fashion as the squirrel cage of an induction machine. When rotor speed differs from the stator-side electrical speed, currents are induced in the damper windings. These currents set up a torque that has the effect of pulling the rotor back toward synchronous speed. This is true whether the rotor is spinning above synchronous or below synchronous speed.
When the rotor is spinning at synchronous speed (i.e. zero slip), no currents are induced in the damper windings.
Damper windings are commonly found on large, low-speed, salient pole machines, where there is a tendency to have inadequately damped rotor oscillations without the amortisseurs.
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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.
What is LV winding of a transformer?
For a step-down transformer, its secondary winding will be the LV winding. For a step-up transformer, its primary winding will be its LV winding.
What is field winding?
The field winding on a generator is the winding that is electrified to create an electromagnet; it is generally the winding found on the rotor (the rotating part of the generator).
Lap winding and wave winding?
Both lap winding and wave winding are found in the use of DC generators. The main difference is as follows: lap winding is high current, low voltage, and wave winding is low current, high voltage.
What is winding transformer?
A winding is the name given each of the coils wound around the transformer's core. A basic transformer has two windings, termed the primary winding (connected to the supply) and the secondary winding (connected to the load).
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 function of the damper winding in alternators?
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.
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.
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 .
What is another name for harmonic balancer?
AKA, crank pulley damper, crankshaft damper, torsional damper, or vibration damper.
Where is the damper on a furance?
were is the damper on a furance
What precautions should be taken during the start-up period of a synchronous motor?
Reduce the speed of the stator magnetic field.Use an external prime mover to accelarte the synchronous motor upto synchronos speed.Use damper windings.
How is damper made from grass seeds?
well they pick grass and put it in the damper and mix it and it becomes damper
How do remove and replace a strut on a 97 Nissan Sentra GXE?
Honda calls it a damper. If you want the front damper. Remove the brake hose clamps from the damper remove the damper pinch bolt (on the bottom). Remove the damper fork bolt. then remove the damper by removing the two 10 mm nuts on top. Do not try to Disassemble the Damper without a spring compressor.
