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August 14th, 2018, 06:32 AM   #1
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How this Synchronous generator work?

Hello
can you explain how salient pole generator work in power dam?
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Last edited by skipjack; August 14th, 2018 at 11:41 AM.

 August 14th, 2018, 09:44 AM #2 Math Team   Joined: Oct 2011 From: Ottawa Ontario, Canada Posts: 13,612 Thanks: 954 Phone "Information Division" of "Generator Section" of "Power Dam Department". Ask for Joppy. Thanks from Joppy
August 14th, 2018, 11:41 AM   #3
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Quote:
 Originally Posted by EBTERTTBT Hello can you explain how salient pole generator work in power dam?
Some information is given here.

 August 16th, 2018, 12:42 AM #4 Banned Camp   Joined: Jul 2018 From: INDIA Posts: 93 Thanks: 0 How does these generate power So high in MVA
August 16th, 2018, 08:35 AM   #5
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Quote:
 Originally Posted by EBTERTTBT Hello can you explain how salient pole generator work in power dam?
It's constructed from two things. The Stator and Rotor .The stator is a cylinder made by a material that is a good conduit of magnetic fields. The rotor is again a cylinder inside the stator in which poles are attached on it. Poles are wires in the form of a skein and work exactly as coils.

Now we give a small DC power in the poles of the rotor and we spin it. The faster the rotor spins and the more DC power we give it the more electric power we gonna take. But we can also increase the number of poles in the rotor. The more poles, the more power the generator will generate. The mathematical formula for this is given by:

$\displaystyle F = \frac{N \cdot P}{120} Hz$

Where F is the frequency of the rotors rotation
N is the speed of the rotation in RPM
P is the number of Poles.

So in order to increase the power that the generator is going to give us we can do:

1) Increase the rotation speed (the most common way).
2) Increase the number of Poles (very useful in rivers where the river can not give enough kinetic energy to increase the speed of the rotor, so we use more number of poles to increase the outcome power).
3) Increase the DC power (less common way, because the whole point of the generator is to take that DC and multiply it using kinetic energy).

Now how exactly does it work? The poles in the rotator when DC power is flowing inside them they create a magnetic field. Also because the stator is also made from the same material, it also creates a magnetic field. Also notice that between the rotor and stator there is a small gap, and there is where the magnetic fields are being united together creating one whole magnetic field. Now when the rotator is rotating, the magnetic field also rotates. So now we have a magnetic field that rotates (rotor's field) inside another static field (the stator's field). This causes something known in Physics as: Electromagnetic induction and this induction generates electrical power.

If you want to know more about it, you need to read it because this is a whole subject by itself, it's not easy to explain everything, but this should be enough to understand the basics.

Last edited by skipjack; August 16th, 2018 at 08:55 AM.

 August 16th, 2018, 11:02 PM #6 Banned Camp   Joined: Jul 2018 From: INDIA Posts: 93 Thanks: 0 hello how to build big synchronous generator for dam
August 17th, 2018, 06:58 AM   #7
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Quote:
 Originally Posted by EBTERTTBT hello how to build big synchronous generator for dam
Well you need something for the water to move in order to rotate the rotor. This is mostly done using Watermills.

Then you need to create enormous generators (big size of stator and rotor) and probably more than one and connect them to the network (no the internet the electrical network) to share the generated electrical power with the people. Connecting them to the network is not easy because when using more that one generators you have to Synchronize them (in frequency and speed) to match the network. This is important because if the generators produce more power than the network provides (for example in Greece is 220 volts one phase only, 3 phases give 400 volts) it can destroy Electrical devices or even kill somebody!

One thing to notice is that generator for dams because they depend on the speed of the moving water, they usually don't generate enough speed for the motor to spin. This results in low outcome. In order to solve this problem they increase the number of poles in the generators rotors in order to increase the outcome power.

Also one thing that is hidden from the formula i gave you before is the physics terminology of Torque. This is a property of spinning objects that help's reduce the amount of force you need to apply to an object to spin it by increasing the distance you apply the force from the rotation point. If you apply this then the force that the water applies in order to spin the generators motors doesn't have to be that much if you just create long axis that will be used to spin the rotor.

I hope that helps

Last edited by babaliaris; August 17th, 2018 at 07:01 AM.

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