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In the process of hunting when a DC generator (alternator) is subjected to a sudden change in load (in the stator) causes the rotor to hunt for a new equilibrium position (let us take the example of a pendulum when its made to oscillate with a general push it oscillate with a particular amplitude and frequency and after its oscillation, reaches the mean position, but as a certain load say 2gms is applied to the pendulum, oscillation changes and pendulum tries to attain a new amplitude and frequency as the applied load suggests) similarly in the case of alternator as the load changes rotor attains a new equilibrium position say of a particular degree(z)and the degree of rotation changes from (0 to 360 previously to 0+z to 360+z degrees with a new changed position) which refers to hunting in general sense.
Always remember in an alternator stator consists of armature windings and rotor consists of field windings and the main field flux is produced in the field windings (just opposite the case in an induction motor)...
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What are the effect of hunting in synchronous motor?
1.it can lead to loss of synchronism. 2.the machine losses increases 3.temperature of the machine rises . 4.it can increases the possibility of resonance.
Why is the frequency of a synchronous generator locked into its rate of shaft rotation?
By definition a synchronous generator must be synchronous. If it is not "locked in" it is not a synchronous generator, but an induction machine.
What is emf equation for synchronous machine?
ediot
What do you mean by synchronous watt?
It is that torque which at the synchronous speed of the machine under consideration would develop a power of 1 watt
How can you simulate the synchronous machine using pscad?
drag and drop and run
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 .
Why the synchronous machine rotate at synchronous speed?
The spatial distribution of the windings in the armature is designed in a way such that it produce a rotating field when a three phase source is applied to its terminals. The field windings have a DC field applied to it and it is rotated mechanically by a prime mover. If the prime mover tried to rotate the synchronous machine at speed higher than its synchronous value then the power output of the generator will increase and this causes the speed to "lock" again to the synchronous one. If the prime mover applied less torque then the machine will slow down but the power output will decrease DUE TO DECEASE in the applied torque and this cause the machine to "lock" again to synchronous speed of the grid. The same principle can be applied to synchronous motors except that torque is negative (i.e. the prime mover is applying negative torque)
Applications of synchronous motor?
It is used in variety of applications such as... · Machine Tools such as a ball mill · Motor generator sets · Synchronous clocks · Timing devices · Synchronous condensers to condition electrical power · Record players · Robotics
Why the no of poles are less in induction machine compared to synchronous machine?
The number of poles determines the speed a machine has to turn (RPMs). The more poles, the slower the machine can turn. I don't believe your statement is true. I've seen synchronous generators, for example, that turn at 1200 RPMS, and induction motors that turn at ~1800RPMs.
Why the synchronous motor is always a salient pole machine ie why don't we use a cylindrical pole machine as a synchronous motor?
The speed of the machine is tied to the power supply frequency and the number of poles the machine has. It becomes impractical to make a round rotor machine with many poles, so machines that spin at low revolutions will typically be salient designs. A two or four pole machine could be round rotor designs.
What in slip speed control?
slip speed control refers to induction machines s=(synchronous speed-motor speed)/synchronous speed by varying slip the machine can be either be operate in generated mode or motor mode
What is synchronous machein?
mainly alternator,synchronous motor comes under the synchronous machine.a synchronous motor is not a self starting motor.if a synchronous motor moves with more than synchronous speed then it acts as a synchronous generator.
