How an Alternators work | How 3 phase Electricity produce | Generator working principle brushless

Welcome back again in the new video of power learning channel. So my dear friends in today's video we will discuss about AC three-phase alternator which are used in diesel generators. AC alternator is a main component of diesel generator. Diesel generator having two main components one is diesel engine and the other is AC alternator. So in today's video we'll discuss about three-phase AC alternator. So once the three-phase AC alternator is coupled with the engine it will produce AC electrical power which is three-phase. In industrial generator we are producing three-phase electrical power. Three-phase power is very common requirement of all the electrical item which used in industries. So in today's video I will explain you in details how the AC alternator is producing electricity while it's taking mechanical power from the diesel engine. The diesel engine is coupled with the alternator and diesel engine is only producing the mechanical power and it's giving this mechanical power on its engine shaft which is having flywheel and the flywheel is coupled with the alternate coupling plate of the alternator. So the main router of the alternator is coupled and it is rotating with the power of engine. So the alternator having several parts so I will explain you about these parts. So the number one is main stator and then main router. After that we have exciter stator and we have exciter router. So these are the four main parts four main windings which we have on our alternator. Main router, main stator, exciter router and exciter stator. So as you see on the screen now these are the complete alternators without engine. Okay so on this we have this coupling plate okay and we have also terminal box. From the terminal box we took the power and we will connect to our panels where we need the electrical power. Alternators are available in single bearing and double bearing specification. Now you see on the screen this is a complete genset which is coupled with the alternator. As you see as you see on the screen now the rear part is alternator and the front part is the engine and here also we have in our generator the control panel from where the operator can operate the generator. So now you will see what is exciter stator. So this is the exciter stator. Okay I will explain you about it and this is the main router and exciter router. So my dear friends welcome again. So now with the and this picture we will understand that how our self-excited alternator is producing electricity with the help of diesel engine. The diesel engine is coupled with the main router. The shaft as you see in the picture this shaft having a disc plate which is connected on the flywheel of the engine and once the engine is rotating the flywheel is which is connected with the connecting plate of the stator our alternator is revolving also the main router of our alternator. So what is the link between the revolving of main router why we are making rotation of the main router and how the electricity is produced. So first of all you will aware about the parts of the main stator main alternator. So here if you see we have shaft which is coupled with our engine then we have bearing and we have fan. Fan is using for alternator cooling and here if you see we have two wires and one is dotted wire this is AVR source of power and sensing from alternator output okay sometimes we are using two phase and sometime we are using three phase and these wires as you see is going to our AVR. AVR is sensing the main stator voltage and giving DC power to the exciter stator. This part which you see this is exciter stator and the in between this is called exciter router. So now I will take you on the this picture as you see in the 3d view main the main component of the alternator are stator and inside the stator we place the stator winding which is red color these three wires as you see these are the main stator winding which is connected to our load and supplying the AC power okay and this AC power we took from here sensing voltage for our AVR. So now what will happen once the voltage is generated it will give sensing voltage to the and once the AVR is getting sensing voltage from the main stator this reference voltage will generate the AVR DC voltage and this DC voltage will excite our exciter stator windings. Once the flux is produced inside the field winding of the exciter stator the revolving armature of the exciter stator will cut the magnetic line of force and it will produce will produce the three-phase AC power. This three-phase AC power will connect with on our diode plate and this diode plate is having three-phase diode assembly which will convert this diode AC power three-phase AC power to the DC and this DC power will go to our main router. So in this way our main router will get excite and our main router having four poles we have two north pole and two south pole and these two positive and negative will excite and make it as a electromagnet. Once this electromagnet router is revolved inside the stator winding so it will again produce the electrical power the voltage. So this is the simple way to understand that how the electricity is produced and this system is called self-excitation system of our alternator. This kind of alternator is called self-excitation alternator. So now you see you understand how the voltage is produced in the self-excitation system. In the self-excitation system the main router which is coupled with alternator is revolving inside the main stator winding and once the magnetic flux is produced on the main router and within the air gap the stator winding will cut the magnetic flux the magnetic field it will produce the electrical power. Here if you want to see as you see the main router is in the middle and the main stator winding is on the in the parallel of the main router. Once the revolving shaft is moved with the help of the diesel engine it will produce electrical power. So my dear friends if you have any question you can ask me in the comment below and inshallah in next video I will try to explain about permanent magnet generator excitation system. So thanks for watching Power Learning channel. See you in the next video. Till that take care and have a nice day. Assalamualaikum.