I highly appreciate the cut-out of the stator and rotor, because by doing so isn't stupid, rather it did explain the working of induction motors clearly. Your bold and flat-out disassembly isn't outrageous, yet is a showcase of the apical of science education and popularisation.
@TheeAldeen
12 жыл бұрын
I love how we as humans take things apart to understand them so naturally watching this guy tear through this thing makes me feel like a kid again!!
@eeprofessor
13 жыл бұрын
A great video for the classroom, the stator rotating magnetic field animation is particularly effective.
@Beachbum705
11 жыл бұрын
Without going into particulars of the formula, if you multiply the 120 by your frequency and divide by the number of poles you have your get the speed of rotation. in this motor 120x60/4=1800. This is your Synchronous speed. To answer your last question the only way to change the speed (without doing some sort of major overhaul) you simply increase or decrease the frequency. easier said than done, without proper electronic devices/components.
@WTF_BBQ
10 жыл бұрын
All the praise and technical scientific talk about this motor not once did the narrator give credit to the person who invented it .... Tesla.
@eraconline
10 жыл бұрын
** 3 person, including Tesla, -invented- discovered the induction motor within the spam of a year at various places on earth. Tesla made it's wide spread use possible.
@WTF_BBQ
10 жыл бұрын
I am not aware of any other inventor who built the polyphase induction motor. As far as I know, everyone else in the world thought it was impossible except for Tesla.
@eraconline
10 жыл бұрын
Look up Galileo Ferraris
@flupoop
10 жыл бұрын
Are you stupid? Tesla did not invent this! Doliwodobrovolski did!
@eraconline
10 жыл бұрын
Dud watch your language, the internet isn't kindergarten
@SenneVorsselmans
11 жыл бұрын
Awesome, was really looking for a good explenation for my finals :D
@Beachbum705
11 жыл бұрын
It will be connected to an AC power source, this can be 3 phase or 1 phase. AC flows in a sine wave, (kind of like a horizontal 'S' if that helps). This allows for the "switching". The magnet part is constantly switching 'N' and 'S' poles along with the current. (opposites attract). As for the 1800 rpm, The 3 phases are 120 degreese out of phase with eachother(Not 100% sure bout that reason, but the number is right) and the source frequency is 60Hz and there are 4 poles in this particular motor.
@klingest
11 жыл бұрын
It may seem so, but they do have this force. That is how it works! The heat you are talking about is taken into account when designing these motors. So it is not a problem. the rod's does not get as a hot as a wielding rod, but of cause they do get hot. The motors are designed so that the short circuit current doesn't have to be that large. That is why, it isn't as simple as explained in this video, when you have to design them in real life. Engineers thinks a lot about these things. I am one!
@gcrawford304
11 жыл бұрын
David yes your correct. Government will try not to let this get to big. Beecause now that's 'hurting gas (big oil) and other companies. Since no parts actually touch that cuts down on wear tear. So less maintenance
@greenmarine5
11 жыл бұрын
Awesome a video on 70 year old technology
@DanFrederiksen
12 жыл бұрын
the way I try to understand AC induction motors is via the Lenz effect. hold a neodym magnet over thick alu and feel how it resists movement. so when the magnetic field effectively rotates this Lenz effect drags the rotor along
@klingest
11 жыл бұрын
that is because of the eddy currents. You don't necessarily need a circuit. The aluminium bars in a linear induction motor will induce currents within itself producing a magnetic field that repels the other magnetic fields. But that plays no important role for the squirrel cage motors.
@MenzelMotors
3 жыл бұрын
cool video
@0118uhauha
2 жыл бұрын
fine explanation
@iliacht5
12 жыл бұрын
Not 3 copper wires but 3 copper coil pears which is total of 6 coils (lets say 6 for simplicity).The pairs are positioned one against the other across the rotor, and they are wired so when the current flows through first one it creates north magnetic field and when through the other-sought. Each pair is fed by one of the 3 phases.Now what creates that rotating magnetic field is a specific property of 3 phase system.You can see that if you check voltage vs time graphics of a 3 ph. system.
@patrikleskovec334
8 жыл бұрын
GREAT VIDEO, GREAT EXPLANATION! TNX A LOT! :D
@klingest
11 жыл бұрын
Acually i was a bit wrong before. The currents may be very high in some cases, but the dissipated power in the rods is P = I^2 * R , and the resistance in the rods is very low, which means that even though you may have high currents it is not a problem, because the dissipated power will be low, because of the low resistance of the rods. But still, the rods do get hot. But it is not that much of a problem! and you design the motors in a way to reduce the currents.
@iliacht5
12 жыл бұрын
Not sure but I think this is not Asynchronous Motor. I think the 3 phase ones are usually synchronous only the single phase are Asynchronous. Basically if the rotor rotates with the same speed as stators' magnetic field then it is synchronous. Vice versa if the magnetic field can not make the rotor to run at its speed i.e.the rotor slips by a bit the it is asynchronous.
@dalebradshaw3543
11 жыл бұрын
They are separated by 120 Deg cause you have 3 phases and 360 Deg to cover
@klingest
11 жыл бұрын
I have not done it myself, but i have seen it demonstrated many times. What is you point? It is two different things, but the basic principles is the same. I don't think! I know that the aluminum is affected by the stator, but it is not a problem, because the induced current is not that that great.
@vasanthkumar360
7 жыл бұрын
need some more information about rotor construction
@benjohnson7974
11 жыл бұрын
best explanation possible !
@TheCerberusInferno
11 жыл бұрын
Excellent video
@klingest
11 жыл бұрын
If the induced currents was a real problem, then no induction motors would work, because the aluminium rods would melt. But they do not melt, and induction motors works fine!
@Observer1964
12 жыл бұрын
I have been thinking that the alluminum rods in the rotor are not meant to conduct electricity although it is the official explanation.. the inducted shortcircuit current would heat up the rods like a welding rod. the alluminum however has strange effects on magnetism look at experiment where a magnet is falling through a alluminum pipe or the maglev train or linear motors... inducted current just does not seem to be able to have this force.
@droberts12345yt
12 жыл бұрын
Nice video sure wish I could hear the person talking over the bad music.
@Observer1964
11 жыл бұрын
no it is not a problem it is what makes the motor really work, whitout the aluminum in the rotor or replacing the aluminum with copper it does not even work, the copper may get hot but it wont spin. KA and SKA motors dont really work like explained in the official theory. SA motor work on that principle, but has copper windings in the rotor for magnetic induction. cont.
@Observer1964
11 жыл бұрын
OK... did u ever try throwing a magnet down an alluminum pipe yet? did you see the magnet falls with way way less than normal gravitational acceleration? Dont you think then that all this alluminum in the rotor is not affected by the magnetic fields of the stator? i mean if alluminum pipe can brake the fall of a magnett like it does, that it wont be effected by the spinning fields... like trying to maintain relative position to the fields, and the drag of rotation ... it does not add up.
@Egymizo1
11 жыл бұрын
this video is amazing .... job well done thank you
@billybonewhacker
11 жыл бұрын
i like tesla as well but he spent hie time and money stuck on that oscillator. which he himself said would never achieve much.and he had so many great ideas that he could have perfected.
@Observer1964
11 жыл бұрын
I m an electrician and have worked with electric motors and know the different designs. no need to try to explain. what i am pointing at is cleerly not what u understand from it. Thats why i gave the links to the vids. Also a linear motor has no Shortcircuit rods or other type of conductive elements, just aluminum and windings like the stator of a motor, in fact a linear motor is like an unrolled stator on wich u place an alluminum plate. But i guess u need an open mind to see what i try to say
@Nehmo
13 жыл бұрын
Good vid. Now I need the next lesson, please. `~- Nehmo
@engrrabiul2090
10 жыл бұрын
Its very good electrical technology.
@klingest
11 жыл бұрын
I know what i am talking about. I have been designing motors and generators for quite a while now, and yes ofcause you have losses in the aluminium rods, but it is not that much of a problem, because you design the motors in a way to reduce the currents in the rotor. if you want a basic understanding, then read this: wiki/Induction_motor and for the rotor losses, read this: wiki/Rotor_(electric) There is more to it, but this will do for now!
@willam4174
10 жыл бұрын
this is not exactly true, induction motors use poliphase systems (3-phase) but anyway this is good demonstration
@sethmoening9650
8 жыл бұрын
I thought the same thing. The three coils are not exactly turned on & off, the magnetic strength of the 3 coils changes to the 3 sine waves spaced 120 degrees apart. And the 3 coils are spaced 120 degrees apart as well.
@hassanhureshi891
11 жыл бұрын
good explanation but scary
@Fred6191
12 жыл бұрын
@florinc93 do u have power distribution videos as well
@Platano_macho
3 жыл бұрын
Can you make a generator out of these?
@EETechs
11 жыл бұрын
Get out a 400 Hertz electric saw, then you will not be laughing. The power-to-weight ratio of 400 Hertz motors is insane to say the least and they make 400 Hertz power tools for specialized industries that involve stone cutting. Unfortunately, we, the mainstream consumer are left with weak ass brushed universal motor tools that limited to 120 volts and 20 amps breakers. Can't really lug around a 60 Hertz AC induction motor with high power as it would be very heavy!
@MadCodex
11 жыл бұрын
I like Tesla, but this time I wuld say "Thanks Dolivo Dobrovolsky"
@spiltmilkmaniac
12 жыл бұрын
IQ20000 Actually the USA limited Tesla, dropping funding for the Wardenclyfe Tower and holding his research as classified information
@jackwhite3820
11 жыл бұрын
Yes nice popular science video with lots of shiny animations and heavy duty grinders, so that the viewer doesn't get bored ;) But I don't think this video conveys the working principle or physics as clearly as it could have.
@Observer1964
11 жыл бұрын
KA and SKA are dutch for squirrel cage type motor sorry...
@Caleidus
11 жыл бұрын
In 1885 Ferraris demonstrated working induction motors. Ferraris never wanted to patent his inventions on the ground of ethical reasons. He was pushed by his collaborators to write a paper in 1888. Tesla (who knew italian) came up with the invention in 1888 as well. Ferraris died young and so he Tesla was able to start a self promotion propaganda about the paternity of the idea. Ferraris was a gentleman, Tesla no !!!
@TheDevika001
12 жыл бұрын
so the 3 phases means that there are 3 copper wires containing current simultaneously......??is this so??
@carultch
Жыл бұрын
3 phases means that there are 3 live wires conducting current with waveforms that are time-delayed from each other, and a common wire called the neutral, that could carry return current if there were unbalanced loads. The reason there are 3-phases, is that there are multiple coils in the generators that produce it, that are at different positions around the generator's rotation. One picks up its peak current from the generator, and the others each pick up the opposite current at half the magnitude. One of the others is increasing its current, and the remaining one is decreasing its current. The waveforms are time-delayed from each other, because they pick up a different part of the magnetic field in the generator.
@Observer1964
11 жыл бұрын
also watch this v=OI_HFnNTfyU it shows a lot of things that should make you think again... the construction of the rotor has little to do with induction and current but with magnetic river. and if u have the chance make a rotor without the alluminum and see if it still functions as before... it should if it works on electric induction only,
@soniarose530
10 жыл бұрын
Fantastic explanation
@swayingGrass
11 жыл бұрын
Ok, this is nice but I still don't understand some things. First, what make the copper coil switching one after the other? Second, it said 1800 RPM, and I watch at NatGeo "Mega Factories" the Tesla Model S can reach hight speed, that means hight RPM. My question is what can make the RPM changing, the power source or what? Thx, hope can help me
@carultch
Жыл бұрын
"What makes the coils switch one after the other?" The answer is three phase electricity. Three phase electricity consists of 3 voltage waveforms that are time delayed from each other by 1/3 of a cycle. This is caused by the power plant's generator coils also being energized with a similar time delay. The phases are called A, B, and C. Suppose we have an amplitude voltage of 170V for each phase to neutral, and 60 Hz (as we do in the USA). This means voltage of each phase is given by: Phase A: 170*sin(120*pi*t) Phase B: 170*sin(120*pi*t - 2*pi/3) Phase C: 170*sin(120*pi*t - 4*pi/3) So while phase A is at its peak, phases B and C will add up to the opposite. One of these phases will be increasing in voltage, while the other decreases. This increases the current delivered to one coil, and decreases the current delivered to the other. As a net result, the magnetic field in the center of the windings will follow the time-varying current among the windings. The south pole chases the magnet field from the coil that becomes more positive, and the north pole chases the magnetic field from the coil that becomes more negative.
@carultch
Жыл бұрын
As for 1800 RPM, this is a rotation rate that is directly determined by the 60 Hz power supply. The geometry of the coils causes this particular design of a motor to rotate at half the frequency of the electric supply, and this half ratio is common for 3-phase motors. If it were a different design with only two magnetic poles and one coil, it would rotate at 3600 RPM, a rotation rate that matches the frequency. The video doesn't do a good job explaining anything about the term asynchronous, because when the steady state rotation rate is directly determined by the electrical frequency, that's a synchronous motor. To get a variable speed rate on an electric motor from an AC supply, you need a variable frequency drive, which produces an entirely new set of waveforms at a different frequency to run the motor. Electric cars don't directly use the grid frequency to power their motors, but instead use inverters to generate 3-phase AC power from the DC power in their batteries. And frequency is just a software setting for inverters, so it is no issue to change it on a whim.
@thomassenaganyo5608
7 жыл бұрын
powerful
@RobertLogic
7 жыл бұрын
"No mechanical parts" lol
@mtraven23
4 жыл бұрын
right? pretty sure bearings are moving/mechanical parts (and touching).
@Bapuji42
Жыл бұрын
Why does the field rotate 30 turns per second? The period of 3-phase power is still 60Hz.
@carultch
Жыл бұрын
Good question. The frequency in the coils is still 60 cycles per second. The geometry of the coil and magnet arrangement is what makes the field turn at half the frequency. A 2-pole motor would spin at 3600 RPM, where the rotation rate directly matches the power frequency. The magnetic poles return to their original configuration after 1 complete rotation, such that the magnetic field rotates at 3600 RPM and so does the permanent magnet rotor that follows the field. A 4-pole motor has 4 magnetic poles that alternate between north and south. It takes only 180 degrees of rotation for north pole #2 to take the place of north pole #1. The magnetic poles have effectively completed a single cycle in just one half of a rotation. So even though the magnetic field rotates at 3600 RPM, the permanent magnet rotor that follows the field only needs to rotate at 1800 RPM.
@Bapuji42
Жыл бұрын
@@carultch Ah, that makes sense. Thank you.
@wallace0419
10 жыл бұрын
how does saliency pole PM Motor work?
@SaumilShivdikar
12 жыл бұрын
this was telecasted at Discovery Turbo :|
@spiltmilkmaniac
12 жыл бұрын
How did you determine he stole it ? It seems to me that they discovered induction motors concurrently. I wouldn't have thought Tesla was the kinda guy to straight up steal others inventions.
@dmoneyusa2851
11 жыл бұрын
The motor is AC motor am I right?
@FunSketchMovies
3 жыл бұрын
yes
@EETechs
11 жыл бұрын
Its already big... Else we would not have over 95% of manufacturing equipment using electric motors like AC.
@Caleidus
12 жыл бұрын
Galileo Ferraris Invented induction motors. Tesla just stole the idea
@alimaster5292
7 жыл бұрын
what language is the subtitles ?
@mervinfischer627
7 жыл бұрын
Dutch :)
@sekolahonlineteknikotomotif
2 жыл бұрын
2022
@lambertlazaro2407
4 жыл бұрын
I feel sad for destroying it for the sake of science.
@Caleidus
13 жыл бұрын
Thanks Galileo Ferraris. Tesla just stole the idea
@ADRIAN6078
12 жыл бұрын
how its made:??
@Observer1964
11 жыл бұрын
Look again at how a linear motor works... it has no copper, no rods no electric circuit in the aluminum, the aluminum just gets repelled by the magnetic forcefields.
@spiltmilkmaniac
13 жыл бұрын
Thanks Tesla
@abiramisiet
11 жыл бұрын
can u present subtitle in english..??
@swayingGrass
11 жыл бұрын
Ok.. When I serching I founded this video "How AC Generators and Motors Works". Instead understand, I become confused... What I learned from that video is, this is a three phase AC motor, with 6 poles (3 pair(3north, 3south)), the formula 120*f/P=N (120*90/6=1800) for RPM. I think higher flow of electricity will make it spin faster. What make me confused is, it's from 1 source of AC power. So, does it branch to three, bla bla bla bla...? I can't send this for 3 days cuz "Eror, Please Try Again"
@Caleidus
12 жыл бұрын
Thanks Galileo Ferraris. Tesla stole the idea from him
@klaass
9 жыл бұрын
Sometimes i thinnk over horses
@eraconline
10 жыл бұрын
That's a pretty bad explanation of how it work but oh well.
@ankurpatel5554
10 жыл бұрын
This so much cheaper to make this than to make a gas engine
@rp-rh8pb
10 жыл бұрын
Yes, and therfore the eletric engine is older than the gas engine. But gas is a greater energy source in J/kg than any kind of battery we know...
@RahulRaviM
8 жыл бұрын
well explained :)
@iversonjcameron
11 жыл бұрын
Nice vid but cutting a nice good workin motor??? I couldnt
@OmarBecheer
11 жыл бұрын
PERFECT (Y)
@rrgiri
10 жыл бұрын
fantastic :)
@EETechs
11 жыл бұрын
You know what I find VERY HILARIOUS? The fact the you guys and all other oil Barons are using AC motors to pump oil out of the ground. ROFLOLOLO. Also, last time I checked, over 95% of industrial manufacturing equipment is powered by AC motors. So, were are those little Briggs and Stratton engines, hmm? Also Briggs has a mkt cap of $962.84 MILLION where as an electric motor manufacturer such as Regal Beloit has a mkt cap of $3.06 BILLION. Seems to me that combustion engines are the small fries.
@Observer1964
11 жыл бұрын
Also KA and SKA rotor respond to the frequency of the power for the rotation not the strenght. to change the speed of KA motors u need to change the frequency u put into it. look at the small difference in the rotation of the field and the rotation of the rotor and compare it to the magnet falling down a aluminum pipe. what you try to explain to me i already had in school and believed it for the bigger part of my life. I just notice it is wrong and does not explain all observations u can make.
@hardyexe
12 жыл бұрын
All hail Lord Tesla!!
@EETechs
12 жыл бұрын
Nope, Try again. In industrial manufacturing 3-phase asynchronous motors are a common thing. Nearly all equipment is powered with asynchronous motors. You should work in the industrial environment like I do so you can see for yourself.
@jaouad2680
5 жыл бұрын
Ik zweer het je vis
@kerimil
12 жыл бұрын
fckin magnets how do THEY work ??
@carultch
Жыл бұрын
en.wikipedia.org/wiki/magnetism
@j5892000
4 жыл бұрын
No mechanical parts ? There's msny mechanical parts in that motor lol
@DickCheneyXX
11 жыл бұрын
Anyone with a pension fund does...
@Observer1964
11 жыл бұрын
v=OI_HFnNTfyU or search for 'Professor Eric Laithwaite: Magnetic River 1975' Sofar it is the best i can find to explain what i mean to say.
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