Generator V/s Alternator : What's the difference? 

Automobile alternator is basically a alternator. The alternating current is converted to direct current via a rectifier.

@@mazeofworld5155 Thank you for rectifying. I researched a bit and found it to be true.

Thank you.

Next time explain for week because some disturbence for dreawing.... Kk

U can by a power inverter and easily run DC on an alternator.. it's 35 usd at walmart!

Les Hulsey Thank you. I am trying to correctly tune my accent for everyone so that nobody finds it tough to follow. Thanks once again and god bless you as well.

polymetric Agreed. The difference can be done on fewer points only.

Glad to know that 🙂

Edit: please read the pinned comment.

spelunkerd

op a Thanks please share and subscribe :)

ABOOTHAHIR U Anytime :)

yekeen adekunle Can you elaborate a bit. I was unable to understand your question.

His question is...Can we use a dc generator or as you said induction motor for supplying power to lift. I guess the answer should be to use "Slip Ring Induction motor or wound rotor motor which have high starting torque and used for variable speeds applications."

sujeet kumar Thank you, please share and Subscribe :)

Thank you.

ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-ggslJTb-U7c.html

Thank you :)

Thank you 😊

Thank you very much.

Glad you liked it

Thank you

Yes you can but why using a shunt generator? Also battery power will be required to give power to the motor. So, it's not going to charge the battery although it can reduce the required supply current due to back emf. Hi

Some golf carts use a generator to power the wheels and also starts the gasoline engine. The centrifugal clutch uses a rubber belt to a gear box, the gear box connects to the rear axle with a drive shaft. But if you look at 2 stroke Polaris 4 wheelers, they use a cogged rubber belt.

yekeen adekunle No. There is a specific direction you need to rotate the rotor/armature. It is based on Fleming Hand rule or cork screw rule.

Thank you so much. I wish you all the best.

Joseph A induction motor is what used for generation of electricity from windmill. Induction Motor rotor when made to run at super-synchronous speed (i.e, speed greater than Synchronous Speed), it cuts the synchronously rotating magnetic field and hence generates electricity. This is how windmill generates electricity. So basically both windmill generator and induction motor is same but difference is one works at super-synchronous speed while other at sub-synchronous speed.

Anytime :)

😊😊

Power factor is basically the ratio between Active Power to Apparent power of an AC device or simply put, it is the amount of total power in the circuit being used actually by the machine to do some work. Like an AC motor of 220V and 5A has total power or capacity of 220*5=1100VA if fully loaded. But, when measured using a wattmeter, you will find that it is using some less power than that, say 1000W only. Thus power factor =1000/1100=10/11=0.99. This 1000W is active or real power represented by VIcosφ while 1100VA is the apparent power represented by VI. So, the power factor is VIcosφ/VI = cosφ. Actually, it happens due to nature of load. AC motor for example is an induction machine. By Lenz's law we know that any time varying current passing through a coil or inductor is opposed by the counter magnetic flux generated by the coil. Thus the amount of useful power reduces and only a part of that power does real work while another part is used in generating magnetic field flux. This is the magnetic field flux generated between the stator and the rotor in a machine which is sine of the total or apparent power that is VIsinφ (called reactive power) while cosine component is the actual measurable power that the machine uses that is VIcosφ. That's why we calculate power factor to understand what part of power is actually being used by the machine out of the total power. If power factor that is cosφ is poor then for same voltage and same power demand, the machine will draw huge current and may burn out or affect other loads in the line. Thus it should be as close to unity as possible. Here's a video I made on measuring reactive power using Wattmeter - ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-Z8We1ytQgOM.html I may make a video on the topic in the future as it's a broader concept. I didn't get your second question regarding motor. Can you elaborate. Thanks

@@ervivekchoubey Great. Now my question is, the power grid comes with voltage and current in phase. So PF 1. Then eventually PF will change according to the load. My issue is that this time my source isna GenSet having already its PF 0.8. So my question is: how comes a source has a PF? Also, how can I correct the PF of my GenSet so that I can maximise it VA usage? If my Genset is 2500 MVA / 2000 MW means that PF is 0.8. Can I improve PF so that I can improve 2000 MW to 2200 MW ?

Who said that source has now pf? Source or generator has power factor and it's not unity. That is because of the generator circuit. Generator itself us an inductive component and has two components of reactants which make the synchronous reactance. There isn't much you can do about the generator but the load can be put as to utilise the max active power by Static VAR compensation techniques or by using an over-excited synchronous motor.

If you are talking about wind-generated power then definitely an AC generator or more specifically, an induction generator. Induction motor when made to run higher than the synchronous speed, it begins the generation of electricity and hence called induction generator. Finally, the output of the generator is fed to a converter circuit (rectifier) and stored in a battery. To control the variation of speed, Ball-bearing must be connected to the windmill rotor as well as a speed controlling circuit must be there along with a gearbox to maintain a constant speed. You can learn about the windmill system on Google/RU-vid.

@@ervivekchoubey Thanks a lot

Not specifically but mostly. Alternator is used everywhere like in cars or normal alternators used as backup power in case of power outage. What you are saying is how alternator works (exciting the rotor by DC supply) which I have addressed by showing where the field and the armature coils are located for a particular machine (generator and alternator).

Yes of course it can be done.

Can you briefly explain it, I'll appreciate, thanks

@@NEWNATURE777 A DC current is all what is required to excite the rotor. Now-a-days brushless static excitation is done in which a rectifier unit is mounted on the rotor shaft itself. The AC output from the alternator is fedback to the rectifier mounted on the rotor and the output from the rectifier is connected directly to the rotor windings. Permanent magnet generators can also be used by coupling its shaft to the alternator's rotor and thus connecting the output of the generator to rotor winding with brush. But brushless excitation is more efficient as there is no contact loss/spark and no wear and tearing of contact point. That's why static excitation is more preferred.

@@ervivekchoubey thank very much Choubey, I'm working on ebike using an old alternator, didn't want to use battery to excite it.

@@NEWNATURE777 anytime :)

Chelford Quider an alternator is more economical due to its liw weight, Higher kW capacity. No brushes, no commutators and smooth operation. And if you need DC, you can take the alternator output and fed it to rectifier bridge. The total setup is mire economical than a generator.

The output is AC. But it is said generator loosely.The terms are used interchangeably at various places.

Yes you're right. Efficiency and capability of a DC machine is limited as there is no physical isolation between the stationary and the rotating parts. This problem led to the invention of AC machines.

Sorry I didn't get you. Please elaborate your query.

I mean can the rotor of an alternator be a magnet like neodymium magnet? Then the stator be of winding coils

@@TellAStoryofficial00 It can be but as you know permanent magnets lose their magnetic property over time thus field excitation is a good way. Also by just controlling the field current we can vary the active/reactive power from the alternator which is important. For a permanent magnet that's not possible.

@@TellAStoryofficial00 The magnet is an electromagnet. It receives voltage from the car battery to make the magnet that rotates. In an Alternator.

Not for a DC generator because its already DC voltage. But DC generators are not used now in general except in few applications. Rectifier is necessary where you need DC output voltage from an alternator.

Thank you

Values differ from machine to machine. Any well designed machine will give you 95-98% efficiency. But the factor is the cost and maintenance which us high in case of DC generator as compared to that of an alternator of same power capacity. That's why you won't see DC generator in use generally anywhere. If DC current required, Alternator output is fed to a rectifier.

@@ervivekchoubey if efficiency is almost same and i don't care for capital cost then can i use dc generator to charge my battries?

Yes but not directly. If you are using Li-ion battery then you need a power regulator module to control the charging otherwise your batteries would be left damaged.

@@ervivekchoubey noted and thanks

0786RICARDO In a way you can say that because generators are bigger in size and have thus a speed limitation also because of armature reaction (talking about DC generators). Alternators are basically of two types 1. Salient pole alternator 2. Cylindrical Rotor alternator According to design, salient pole alternators are limited upto certain speed because the poles are like inside out carrying windings and hence rotating them at high speed will cause tearing of the windings under centripetal force. Whereas cylindrical rotors are used where the primemover is of high speed like coal based thermal power plants. Salient pole alternators are used in hydal power plants where the thrust applied is low but output is nominal.

It should be better to have a single coil.wraped around iron spinning fast than many coils, right?

0786RICARDO how can you work with single coil? There are 3 phases and it is the rotor which carries a single DC winding.

Single coil feeding the electromagnet

Alternators aren't used only in cars. What I meant was that if DC voltage is required then one can take the output from the alternator and convert it to DC using a rectifier-filter unit. Hence no need of lossy and bulky DC machines.

You can reach out to me on E-mail

**THERE IS NO FREE ENERGY!** You can't have a free electric generator no matter what you do. However there is a small generator that you can make which can turn fan air into electricity to lit small LEDs. Just search for a video titled "Turn an electric motor into generator" on my channel.

Yes there is. But it's not a machine. The device is piezoelectric sensor.

Er. Vivek Choubey can it convert a spinning fan to electrical energy?

Er. Vivek Choubey (thank you for responding!)

@@chrisawesome3091 this might help you ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-mH3pKaZDON0.html

Sounds good. You can put here a brief idea of what you want to say. And how can I help you?

Thanks for liking

Windmill uses induction generator which is basically an induction motor rotating at super-synchronous speed. It doesn't use dc Generator.

You can ask in Hindi if you know.

That's why I said it is not wrong to call a machine by either name. However the differences pointed out here are between certain design related things in a general Electrical machine, generator/alternator.

Thanks

Normally a DC Generator is referred as a generator whereas its more accurate to refer to an AC Generator as an Alternator.

Why then is a car's generator that obviously has to produce DC to charge a battery, still called an alternator?

Alternators used in automobiles/vehicles are indeed AC generators. Until 1960, dynamos or DC generator were used but after that with the advancement in Electronics and Silicon semiconductor devices, alternators came into fashion with rectifier unit.

@@ervivekchoubey Ok thank you for clarifying. So it has to do with what format of power the rotating parts originally produce, even if power-electronics like a rectifier reformat it at a later stage.

Yes, original emf generated by any machine is AC. In DC generators we have commutators that do the rectification work. But with power electronic converters the rectification is easier and efficient without much wastage of power.

Victor Miranda but the emf polarity changes for a DC generator

It's just one there is no phase in DC. Secondly, yes but alternator is also called generator but alternator is strictly for AC generator

Ok seems i need to study more. Lol. Thank you.

@@ervivekchoubey If an alternator is strictly AC, then why is a car's generator that charges its batteries (obviously requiring DC) called an alternator?

​@@carultch- Because it is in fact, an alternator, which produces AC but is then fed to a three phase full wave rectifier. This changes the AC to the DC required to charge the vehicle battery and power the electrical system.

@carultch Sorry for the late reply. You can check the pinned comment on this video.

nirajan bovi sorry I am unable to understand your question.

I am sorry if the video wasn't helpful to you. However the basic theory says that either the field should be rotating or the armature conductor. In a generator or specifically a DC generator has field stationary while it is the armature that rotates and as armature carries conductor therefore there is a speed limitation on a DC generator due to centripetal force. Another thing is that there are brushes on a DC generator with commutator which causes speed of the DC generator to be lowered further because of sparking. The other type of machine that we have therefore is an alternator where the magnetic field rotates while the 3 phase armature conductor remains stationary. No brush required and thus the speed of an alternator is high and thus the generated terminal voltage is high. That's why the basic difference between generator and alternator is based on what rotates and what remains stationary.

Thank you :)

I don't know something by the name 'magneto'. Do you mean Dynamo, then yes.

@@ervivekchoubey look up “magneto” on Wikipedia. It’s somewhat similar to a dynamo.

en.wikipedia.org/wiki/Magneto?wprov=sfti1

Thanks @David. Yes both of them can be said to be the same. Any generator produces AC current. Although Dynamo has commutator which converts the same into DC, magneto as per definition has no commutator to convert AC to DC. So, that's the slightest difference between them. All of them fall in the category of generator.

No I am from India.

In a Typical Alternator the Magnetic Field run parallel to its shaft, and magnetic poles are re-routed/redirected through the steel claws in a NSNSNS configuration...but, no matter how fast shaft goes...North and South will always be on the same side of shaft. You are welcome

😂 it happens sometimes from RU-vid voice recognition system ...

Sorry 🤦, have corrected it now. It was taken up by RU-vid automatically. Thanks for informing 😅

@@vipulwaghmode29 yes, thanks for understanding 😅

@@ervivekchoubeyno problem , And thank you so much , your videos are giving me a lot information ❤️

@@vipulwaghmode29 Thank you 😊

Yes I do agree. This video is from the time I started making video on RU-vid with very little experience.

Thank you for your feedback.

Kartavya Gupta bhai south Indians ke liye bhi hai ye video warna kr deta.

It's ok bro Double brain use karna padega. Or iske bad me hi bana k dal dunga...

I don't speak Kannada.

True. But alternator is a section of generator which generates alternating current. That's why in the beginning of the video I said that it's not incorrect to call alternator as generator, both are same.

No problem friend. I hope you come up with something better 👍

I'm sorry for the bad experience you had. This was a video when I started my channel and was testing a number of videos. I am improving the quality. I am not a native English speaker hence was finding it a but difficult back then. Sorry for the inconvenience.