AC MOTORS

AC MOTORS - Department of Defense 1969 - PIN 39947 - AC MOTORS ARE SHOWN IN VARIOUS APPLIANCES AND ELECTRONIC EQUIPMENT TO EMPHASIZE THEIR WIDE USE AND IMPORTANCE. AN ACTUAL MOTOR IS DISASSEMBLED TO POINT OUT EACH PART AND THE SIMPLICITY OF CONSTRUCTION. THE PRINCIPLE OF OPERATION IS DEMONSTRATED, POINTING OUT THE MAGNETIC FIELD AND MAGNETIZATION OF THE ROTOR. A ROTATING MAGNETIC FIELD IS PRODUCED THROUGH A DEMONSTRATION. INDUCTION FROM ROTATING FIELD TO WIRE LOOPS IS DEMONSTRATED, FOLLOWED BY EXPLANATION OF HOW THE ROTOR IS MAGNETIZED. CONCLUDES WITH A DEMONSTRATION OF SLIPPAGE AND ITS RELATIONSHIP TO INTERNAL AND EXTERNAL LOADING, AND AN EXPLANATION OF A TYPICAL TORQUE CURVE.

[@catmom2509]

Took a 30 minute video from 1969 for me to finally understand AC motors. Better explanation than any textbook or college lecture that I have had.

[@TheKingOfAces1]

This is an incredible privilege to have tax funded and provided. These videos are extremely powerful. What took me several lessons and classes for many of the provided video's subjects, they made clear in a brief and concise manner. This is a proper public service, thank you.

[@burningknight7]

now this is the real lecture i want to hear in my university

[@CIJAY32]

These guys explain in 36 minutes what my professor couldn't explain in 1 hour of lecture ... Excellent now I can read this textbook lol !!!

[@Bandicoot803]

With these top quality videos, getting an A+ in physics is extremely likely!

[@PlanetPurgatory]

this is like b/w tesla and edison ac and dc.....i thank usa army for making such wonderful videos god bless america from india

[@abdullahalmubin]

These military guys make my day! Better than my Professor! They are awesome.

[@boowonder888]

now i understand my table fan completely. Watch this, you wont be disappointed.

[@Genuigr]

16:20 This just made my day! These videos are so awesome and the teach my more than by teacher in school.

[@MickDaneEnergy]

Just thought I would comment... Left hand rule is for AC Motors Right hand rule is for generators (Like an AC motor in regeneration mode) Thumb shows direction of motion Second finger = Current flow direction First finger = Flux (Flux being magnetic field direction)

[@jingshang6254]

What an amazing video! Best video on the internet that explains AC motors. It starts from the very basics but goes so much in depth, and very well illustrated. I'm so glad I found it!

[@aftabahmad4663]

The way You guys explained, was of course excellent one.

[@omkarjoshi3499]

THe proverb really suits this video..!!! "OLD IS GOLD"..very well explained.!!! not even a tinch of doubt in my mind..!! Great JOB.!!!! HATS OFF ..#respect#

[@edwardcox7169]

"absolutely brilliant conclusion" dripping with sarcasm : ) 21:56

[@willthomsen7569]

Those two had a charming surprisingly entertaining dynamic lol

[@vnandrietta]

Excellent video about AC Motors! I recommend for anyone who has doubts in AC motors! The best video I have ever watched.

[@SeptemberAdam]

You know a lot of youngsters who may happen upon this upload my pan it as "old foggy, decrepid grand daddy junk" But the basic information contained therein is still valid and thus good, you know. One thing or two I'd like to mention about induction motors demonstrated up above, not mentioned in this vid. Compared to regular ac motors, they much quieter in functioning and more durable in operation compared to regular ac motors. They are brushless and so nothing gets worn down during a long time or working, compared to the regular ones. However the trade off (as life is full of them trade offs) is that, as said indirectly by the gentlemen using " they are limited", is that they are caparatively weak in torque or rotational force. Which is why regular ac motors are used, for example, in power rotary saws. An induction motor in that case literally just wouldn't cut it. Like if an induction motor was connected directly to that humongous radar antenna shown in this vid, that big heavy ol thing wouldn't move circularly an inch. It's too weak for that kind of work. It needs a reduction gear box between it's shaft and that of antenna. But, However, because of the engineering make of it, it will last much longer in operation than a regular one, as rotating radar antennas need to operate around the clock to detect and alert. A regular motor, compared to the induction one will burn out sooner than desired.

[@nemesisc6122]

Now that's education, well said gentlemen !

[@SeptemberAdam]

Nice intro and ending tune.

[@sudhansumtripathy]

Hi, thanks for the videos, please upload all the videos regarding electrical engineering,each part so that the students will be benifit of the videos, you have done an awesome help Thanks again

[@Bruno_2]

Great video, the voice of the guy on white is so "classic" to old videos, awesome

[@mikemoore6151]

No worries, this is an UNCLASSIFIED presentation.

[@Varunkm110]

Nice explanation good work. 🎯 on target.

[@RajithaSeneviratne]

so fantastically done! now all i see is crappy powerpoint

[@edemedem4885]

This a great job. Thanks for this

[@Savalandan]

An Old Black and White (but Excellent, Educational and Correct) Documentary Film. Note that in this film Bob uses “Left Hand Rule”, the established rule is “the right hand rule” where you put your thumb in the direction of current (that flows from + to -. The results are identical if the current is defined as the direction of the flow of electrons, i.e. from - to + . Note also that it was Michael Faraday who invented electric motor and not Tesla.

[@WJCTechyman]

Really well-done video for an introduction to induction motors.

[@salimkhan007]

i was searching this kind of video form years now i find these best videos thanks Department of Defense

[@chrishouck4294]

Thank you for your service and explanation! Very many of the thanks.

[@ronaldanore7569]

The best of all i watch thanks its easy to understand

[@godseeker11]

excellent explanation!!!

[@GoldSrc_]

It's so easy to understand now, thanks.

[@Yorumcu63]

great video

[@cameronhanson2881]

Is it just me or did they mess up the direction of rotation. Because in one part of the video a positive voltage applied to both coils the needle moved in between the 2 positives. But then when they were using the graph when they applied positive to both the top is still a north pole and the left is still a north pole. My question is why did the needle turn to the right when it should have gone the other direction?

[@asimdas5716]

Excellent.❤❤❤

[@shivasingh7879]

Incredibly clear explained

[@FTSinclair]

Lol troll scientist always correcting him xD

[@TheCerberusInferno]

This video is excellent !

[@miketooth8119]

very well explained

[@EETechs]

Produces current in conductors which anytime current flows in a conductor will produce a magnetic field of its own. Hence the rotor becomes a magnet when current flows in the rotor bars caused by the moving magnetic field from our magnets on disk example. With AC the stator changed polarity itself and so you get this "phantom" rotating magnetic field instead of needing to spin magnets on a disk as in our example.

[@jamaljamal7675]

excellente methode to learn

[@Dekker90210]

just shows that education is timeless!

[@lx87mustang]

Great video

[@MpMViews]

Excellent video

[@ukhayyam1078]

Very good video Thanks

[@DigGil3]

That MIT graduation really paid off...

[@Zahidalizahidi]

i learned a lot fro this video

[@pikuorguk]

AC Current goes in the field windings, the phase and frequency of the AC current determines how fast the rotor spins. I think you need to learn about induction. Then you'll understand why the rotor becomes "magnetic". You can prove this to yourself by dismantling your washing machine, pulling out its AC motor and removing the insides. Then switch it on and poke metallic things in the hole where the rotor used to be. Do it "right" you'll learn about induction heating too.

[@fobmongrel9925]

I do not understand. If the load is increased, and the amount of current decreases as a result and as it is explained, what causes breakdown of the motor (the stator, I presume)?

[@user-lj9fm9tm7f]

Strangely they omit discussion of the stator amps changing with slippage, and the problem of rotor stall (locked rotor amps) at motor startup.

[@abdiazizmohamed9462]

Old is Gold .... Who is watching 2018??

[@Varunkm110]

Can you please explain all the industrial equipments. Blowers, boilers, heat exchanger, pumps,

[@ramwelito]

i wish my teachers explains like this

[@lokeshbadgujar2208]

Please upload more vedio on syn. Machine... Please

[@Naousaios26]

These old videos are fantastic! What was their initial purpose? Army? School?

[@santiagovega8489]

Greek Dandy the initial purpose is stated in the first 10 seconds of the video.

[@xteeth]

They left out the part about how one makes the field appear to rotate. Assumedly there is not some little guy turning that knob around and around.

[@skuula]

Just connect 2 AC voltages 90 degrees out of phase, isn't that the point made?

[@Szpulenso]

@@skuula how tan all the phases have different voltages, but eventually be connected to each other? Wouldn't electrons "even their speed out" after connecting all wires together?

[@bsdiceman]

I believe it's the AC voltage alternating reversing polarity through L1 and L2 in series that causes the rotating magnetic field. Perhaps.

[@dmanikhine]

Thank you very very much. Please put all electronics and electric Department of Defense video to youtube. Is it possible to download all this video? Thank you once again.

[@ammarsyaf3035]

The voice at 2:32 sounds like EssentialCraft Channel

[@toddmolloy311]

Pay super close attention to 17:11 the keys to the power grid right there just need to induce a much bigger coil !

[@Kg277]

A+ material.

[@cagmito76]

I want a PSM6 looks like it could survive a good blast.

[@jackrumorz]

@dmanikhine yes, it is possible to download. You can go to archive.org/details/FedFlix and download or just use online tools to download videos.

[@MissBina143]

i build a motor in my eye, but the magnetik field it produces feeds it to infinity, how to shut off or protect bashar coil

[@windoes98se]

induction motor FTW simple yet robust

[@7money0man7]

@ 00:40, I have a 115v AC motor just like that one there shown & I'm trying to rewire it, but not to sure& so it can be hooked back up, can anyone help me out? Its has a 1green,1black, 1red, & 1yellow wire also its connected to a smaller device, which is the speed control circuit or transformer with 2speeds high and low... How can I wire it so it can be connected to a 12G wire?

[@leerman22]

Why was America so good at making educational videos back then? Apollo perhaps?

[@likeapinwheel]

Chris Isaak presents: AC MOTORS!

[@thealchemist5376]

Bob is having none of it!

[@FortSasquatch]

Where is the squirrel?

[@ethendixon4612]

Does he not mean right hand rule? Or am I messed up?

[@Thetrucky69]

Excellent information.

[@EETechs]

Common sense dude.... The rotor becomes an electromagnet that is "dragged along" with the phantom rotating field of the stator. You can take an AC motor's rotor and attach it on a free spinning bearing isolated from a disk that you attach a north facing magnet and south facing magnet at opposite ends of each other that are close to the rotor. When you spin this disk with the magnets, the rotor will try to follow this disk that has the magnets on it because a changing magnetic field... Cont..

[@The_Joker_]

Imagine if someone added a battery to an electric motor 🤔they could make electric vehicles 😲😲😲😲😲

[@saboorsaboor704]

how often do you see an army officer teaching AC motors on TV? it is not going to happen in this day and age

[@07shovon]

prof. L UMANANDA senior research scntst..iisc bangalore

[@crimsonsinclair]

finally unclassified hahahaha .... now we know, thanx for the free knowwledge hahaha ... said that, THANX SERIOUSLY ... this is way better than the shit done today

[@tsepofenyane4582]

Really :0 only now i undersyand what the textbook and the lecturer were trying to say. mxm feel like i weasted my moduole feeds.

[@Caleidus]

@psychotickable 1915, Tesla wrote in his autobiography that he "dreamed up" about induction motor in 1882, by chance 3 years before Ferraris experience. No evidence support this claim. It was evidently an attempt to ripp off Ferraris by showing that he pre-dated him. Ferraris was a gentleman, the true forgotten genius, who never wanted to patent his inventions since he thought that none should take advantage from science. Tesla took advantage of Ferraris's honesty....

[@IGmaNIK]

Tesla has invented the electric AC motors, not DC. He believed that DC motors are very imperfect. I can't undrestood, but many people considered that Tesla was discovered of electromagnetism. Video is very intеrestiИg

[@DiondGame]

Maine am test la Masini Electrice

[@acika72]

Tesla is a GENIUS!!!!

[@solidsnake19902342]

that dr looks like gregory peck :D

[@darlingamor6836]

umm...wow

[@mr.radium4962]

People in the 60s were really though look how he put hand in a switched on electric coil at 16:34

[@MissBina143]

magnetik shielding somehow

[@acika72]

i know this video is about AC motors...

[@imyyz4u]

What they do not explain is how you get two out of phase electric currents. The A/C power supply has only one. I know how it's done but wonder why they did not explain how a 'shaded' pole or a capacitor is used to accomplish this.

[@lifeforce3451]

+imyyz4u it was not the wiring ?

[@deseanlothian]

+imyyz4u its in another video of theirs

[@plateofshrimp]

"AC Motors and Generators"

[@andythebritton]

Yes, that's the one thing that's missing.

[@Seandude23]

nobody has Pet Squirrels..

[@07shovon]

to know more and in details abt any electrical equipments like dc and ac generator or motor..transformers..just check out the series of Prof. L UMANANDA Senier research scientist..iisc bangalore...there are 40 lectures in that series and all are added in my favourites..jus go to my acount and tk a lk

[@Caleidus]

Galileo Ferraris invented AC motors. Tesla just stole the idea

[@vel0_rouge]

Do people keep squirrels for pets?

[@acika72]

@psychotickable HA! LOL SORRY ABOUT THAT!

[@safeway3168]

guess I am brain dead.. @15:14 can anyone show the math of how 7.07v is derived ? "when we divide the sine waves into 45 degree segments of time."

[@savinduishan4416]

sin(45)*10 = 7.07V

[@Kg277]

All the dislikes got electrocuted..

[@Good-Enuff-Garage]

why did we stop making videos like this? think about it, what are we teaching these days instead?

[@bigstuff52]

America still made things then--Sad commentary on today

[@MrPeterpott]

This is all wrong. Firstly - they do not say what sort of current is fed in - Is it AC or DC? Secondly - there is no principle that says the rotor becomes magnetic material. In other words they do not understand why the rotor spins.

[@bigstuff52]

Huey Lewis' dad

[@99frofro]

Pet squirrels? lol

[@2020corp]

true that.. at one point they are almost talking about something like stepper motors or 3 phase principles with the 4 coil diogram switching coils.. they are so losted "rotating magnetic field" lol.. when a lot of this ac motor principle actually has to do with how the angular iron pattern in the rotor.. and the residual magnitism acting against the constantly reversing alternating current field.. @EETechs and @pikuorguk.. go read a book and stop acting like you all smarty pants..