Alternator Theory and Operation
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- Опубликовано: 1 июл 2024
- This screen cast will walk students through how a voltage is produced in an alternator and what factors contribute to the amount of required generated voltage as compared to terminal output voltage
Really good explanation!!! It took me many days to find one of the best videos😊
Thank you for your excellent explanation.
Nice one,well explained,thanks.
All the info I've gotten about alternators is that they create AC energy first which is turned into DC by the rectifier.
so it would be the phasor sum of Vphase+Vxsync+Vres
Hello Marc Garner, I am quite aware of that, thanks, 20 yrs ago I flashed field in sisters VW square-back. started charging right away. BUT maybe you know this. I heard that having a load on gen when slowing down, from running out of gas can/or will cause trouble. Have you ever heard of that?
Pretty good explanation. so the field poles for exciter must have residual magnetic fieild, so i guess tying exciter end to ac output the generator is always properly excited?
Raymond Garafano If the field has lost its residual magnetism you can “Flash the Field” by applying a DC source for a spell. This will provide the necessary electromagnetic field to create the residual magnetism necessary for buildup once the machine is put into operation.
Wonderful Explanation , Please would you let us know Where does AVR comes into picture ( like UNITROL 1000 from ABB or what it does )
Thanks !!
Nice.. thank u ..
where is the capacitor connected(38Microfarad) in this circuit diagram shown. In practical brushless generator , a capacitor is used.
Thank you
dosent your e(gen)=V(t)+V(xsync)+V(res) have to be done vectorally? you cant just add them straight up...you have to take into account what angles they are at on the phasor diagram...right?
Bravo davver. By, da
Utenti.itali
Grazie mille
I was an electrical generator repair tech. In the army. the training was very poor. Most army generators are 3 phase. each phase is 120ish volts we were told there was 1 primary phase for general use but it was best when possible to distribute the load evenly across the 3. Someone also implied by using 2 phases and ground to output 240v. No one ever explained how but to be fair I never had a need to do so. All the gennies I worked with had 3 stages on the rotor. 1 dc earth magnet genny to provide startup power to stage 2 the exciter and stage 3 the alternator. Could you do a video to explain how a multi phase genny works and how you can get 240v out of 2 120v phases? I learned more from your 15 minute video than I did in 3 months at ait training in the army.
Being someone who's familiar with the 52 Delta MOS, How much did you expect to learn from attending a 3 month technical course? AIT is suppose to get you familiar with a basic understating of mechanical and electrical fundamentals (Ohms law, diesel engine operation, and using test equipment and general tools. Your true learning is suppose to come from your supervisors in the motorpools.
Army generators from 5kW to 840kW are designed to operate, and support three phase loads. Some of the power consumers we used have three phase motors installed E.G Radars, Weapon Systems and Environmental Control Systems. When your setting up power grids, you want to insure that the load is as balanced as possible. This will allows the generator to spread the load evenly across all three phases. A generator that isn't properly balanced with reduce the life expectancy of the generator.
On additional note... this about the 220 VAC...In Europe (Germany), we use 220 VAC, 50Hz, If we had to use a printer or plotter from our office in the field, we would just take one of the german style extension cords, splice it into two of the three phase, and one to neutral. That will give to 208 VAC when operating in a three phase setup. the 12 volt difference is not a big deal, and because the german equipment works on 50Hz, the motors may turn a little faster.;)
@@haroldbottom3474I ok
how about with three phase connection diagram .pleass ineed it
A lot of people wrongly think that if it has brushes, go brushless. Nope.
If you practice good maint. U start geny every few months an actually put a load on it, you are doing 3 good things, making sure engine starts easily, making sure everything is dry an no leaks and knowing gen will be there when u need it.
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TY
NO Nuclear Damm Its Going TO KILL Us ALL
Please show a 10 kva or 15 kva single phase alternator full rewinding process with diagram and with full service
so i think your Egen should be 122.1v
good
Good
why not include a small earth magnet in the exciter field core so that you are allways garonteed to always have an initial starting field?
lol, I sat down and thaught about it and I think I know why the army uses 3 stages instead of a magnetic core in the exciter. earth magnets lose there field over time naturally. pushing against the north pole of an earth magnet with a northern electro magnetic field and the same with the south could potentially cause an unnatural decay at best or crush the earth magnet or at worst turn it into a projectile.
The Army use a permanent magnet generator on the 3kW, and 7.5kW generators.
@@tberry7348 There's no such thing as an earth magnet. It's called a rare earth magnet because it's made from rare earth elements.
"Prime Mover" Are you referring to some God invisible prime mover?
Dayum hit the wrong button. Once a year, pull brush holder and check brushes, and yes the springs. a good brush set will have a braided wire out of the brush itself, that is often called a 'shunt' larger gens might have brass or metal brush holders but if the brushes have no shunt it is not a good practice. Some large KW D.C. generators have a field winding in series with the load. So whatever current comes off brushes to an external ckt. must go thru a commutating winding.
I cannot understand
Please explain briefly
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Byst
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A generator does not provide 'residual magnetism.' LOL No such thing. A generator provides current. If a generator needs battery current in order to charge the battery, we have free energy. LOL . If you want to charge a battery you do not draw power from that battery.
MrPeterpott residual magnetism is how it self excites itself. This is why people whos generators sit for a long time have to "flash" the field. Same thing with old tractor generators. Im not real sure you know what youre talking about.
Lol wow Peter. Wouldn't be speaking with such a condescending tone when you clearly have no idea what you're talking about. Your arrogance makes me sick. Thanks for the helpful video Marc.
To BearNameJoeOnceMore: Please, go and get yourself a job, stop being a useless clown. You are not a comedian, learn to tell jokes. 05/31/16.
Hey, where did the so-called residual magnetic field came from in the so-called Exciter? Don't tell me the alternator. The alternator had to run to produce power to get the Exciter going so the exciter can get the alternator going so it can excite the exciter so it can get the alternator going. Yea you are something. Cut with all the blah blah blah. I am outta here.
you´re a special kind of dum. the residual magnetic field is in the steal the rotor made of.
@@oliverroedel1111 Residual means left over, not innate. This means your "Primal, primer, primordial mover and a shaker is not so self exciting after all". What am I dumb or something not to know the meaning of residual, (I.e. left over). You know when you toss your left over food towards the dog because he depends on you. Your beloved dog doesn't have his own food. He lives off your residual left over food. Can't make his own. At least residual is not residential. I can deal with that.
@@alchemy1 residual is residual and means that METAL gets magnetic and this is resisual magnetism. en.wikipedia.org/wiki/Remanence