In synchronous motor hunting can be minimized using flywheel to the shaft .
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.
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.
It is definitely used in a turbo-generator
There are 5 types of starting in induction motors: 1) resistance variable method 2) auto transformer method 3) slip ring induction motor method Squirrel cage induction motor using two types of starting methods 1.Direct on line starter 2.Star delta starter
In the event of fire, the fusible link melts and the shutter gets closed. This helps in blocking the fire from spreading through the duct ----- If you are asking about a damper on a stove or chimney, that is not called a fire damper, but just a damper. There is a link to a question on that below.
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.
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.
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.
Reduce the speed of the stator magnetic field.Use an external prime mover to accelarte the synchronous motor upto synchronos speed.Use damper windings.
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.
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.
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.
Damping is the resistance offered by a body when a system is in vibration. But the basic use of a damper(damping) is to help reduce the oscillations or vibrations.we can also conclude that we use damping to slow down the effect of a moving part.Damping controls the amplitude of vibrations just to avoid resonance conditions.
It is definitely used in a turbo-generator
a yaw damper
Reduce the speed of the stator magnetic field.Use an external prime mover to accelarte the synchronous motor upto synchronos speed.Use damper windings.
AKA, crank pulley damper, crankshaft damper, torsional damper, or vibration damper.