Direct Current Electric Motor

[nilanjana96]

@TheLionRichard yup, u r right... but the current v/s time graph will be pulsating instead of being constant

[foiwater]

@TheLionRichard Yes you are correct. While motoring, the source acts a prime mover moving the coil. faradays induction law states that relative motion between a conductor and a magnetic field induces a voltage in said conductor. The thing is, the voltage is induced in the opposite direction of the applied voltage. It is called Counter EMF, and all motor's exhibit it. Thus, all motor's generate while motoring. Because they are being turned while they motor.

[willbirful]

very interesting video thanks

[jayejayeee]

very interesting video thanks

[The007yoman]

Screw My Physics Teacher...

Youtube Is Much More Better..!!!

[a2zhandi]

It appears the current is flowing backwards?

[magna59]

These sort of motors were often found in children toys & also in science kits. There was a Lady bird book, with this design,as a home make experiment, made out of dressmaking pins,a cork & winding made out of a few turns of copper,and the commutator made out of a couple of long strands of copper for the static component and the rotating puck up, pins finishing off the rotating coil. But you do find it will often stalls at the cross over point. 'Real' DC motors have more than one coil.

[stanlelR]

I have it in school now! A great topic!

[trippleciz]

Nice simulation but this is NOT a DC motor. The fact that only a single loop is incorporated in the design makes it  'AC' in its very basic form. . .

[PelletierPhysics]

@trippleciz  The motor is powered by DC current, this is why there is a commutator.

[q7spiz]

@PelletierPhysics So, it is a motor that converts DC to AC.

[1011basic]

@trippleciz All rotating electrical generators produce AC current. The commutator is what changes the generator to DC current.

[blueangel4a]

@1011basic what's a commutator? I'm trying to make something like this...

[Gunner3210]

@trippleciz It is a DC motor because there is a commutator.

[MarkBlyde]

just cleared a massive hurdle with the physics assignment i am working on, thanks to this

you are a god

[MrSydneyB]

how can I copy this video to show for my pupils?

[PelletierPhysics]

@MrSydneyB It is available at web.ncf.ca/ch865/englishdescr/­DCElectricMotor.html

[marwa19939999]

plz anyone have good educational video for ac generato give me the link

[marwa19939999]

it helps me in my study :D amazing

[flaree88]

for the commutator why is there a gap...why sint it all round

[skybayjames]

@flaree88 and RsGhost1 The gap separates each side of the wire loop that is rotating in the magnetic field. The force changes partway through because as it rotates the current in the lower part of the loop is always in the same direction because of that gap. This means that the force on the lower half of the loop is also always in the same direction also. Real motors also use a lot more loops, and don't actually have to rely on inertia to get them to turn through the gap.

[ProuD18paKI]

Can anyone please explain the function of carbon brushes and commutators in d.c motors ?

[mgl924]

I don't entiendo this video

[oars1000]

I don't understant :((

[oars1000]

I don't understant

[magnetismelectricity]

Very nice description,

 please see my video

DIY Strong water cooled electromagnet.

[ketakuzo]

wow

[thaitanium2005]

อันนี้อธิบายได้เยี่ยมมากกกกกกก­กกกกก แจ๋วมาก เข้าใจถึง ดีซีมอเตอร์เลย

[RsGhost1]

Why does the direction of F lorentz change halfway through? The current still flows in the same direction and the magnetic field doesn't change either? Can someone please explain?

[LibertyMagnetMotor]

@RsGhost1 The rotational force in this motor is a result of repel or attraction forces to or from the magnetic pole itself with the electromagnetic field created by the conductor.

[tindicio44]

Vaya, por fin capte. Gracias por tu video. Ahora entiendo el funcionamiento

[gonzalo060375]

I'd wish that motors were as nice as shown on this vid. In reality, electric motors -AC types, specially, are tricky machines and their behavior isn't completely known to engineers.

Maybe one of the few cases of invents we use but still don't fully understand.

Nice animation, btw.

[supercookiebros]

i dont understand anything. :D

[dgphilip1]

Hi, if your interested by this video, try looking up & reading about 'Fleming's left hand rule for motors'. PS there is also a rule for generators ie 'Fleming's right hand rule for generators'....I hope this helps, it did for me!!!

[rahulgurdaswani13]

flemming left hand rule is applied here??????

[hyperdrivephase]

Inertia? wrong. Commutation emission

[Pietentrekker]

Just what I needed, better than 2 pages full of text (Y)

[kengmeatleafer]

I like. Exactly like what I learnt at school :)

[robertgift]

Poorly done.

Arrow is hidden when direction changes. Important detail not shown.

[hamzpi]

hmm,, what happened if we cut the current, and then the motor stops at the no-current position (horizontal mode) and we want to re-run the motor? should we manually rotate it little bit ?

[Synthesizermusican]

i've got a question for you.

why is it necessary to cut off the armature current,and is it rly necessary?

[cvgs0007]

@Synthesizermusican

coz,its really necessary to reduce the loss due to eddy currents (i2R terms)

note:- 2-square......

[turd4me]

@Synthesizermusican splitting the current reverses the direction of the current in the coil, which also reverses the direction at which force acts on the coil ie. when one side goes up (horizontal in the video) then the force must be reversed for it to come back down for the full rotation to occur.

[joryesca]

me parece muy buena la animacion aunque es muy corto de tiempo y le falta informacion.

[Spardeth]

When the armature wire is in horizontal mode (0.02), the armature current is cut off. So how does it keep turning? Inertia?

[PelletierPhysics]

@Spardeth Yes, you are right, it is because of inertia.

[DildoRed]

@PelletierPhysics Inertia wont be enough u have to had something to push it again without it soon it will stop normally we had a coil (srry for my english im french)

[theusamadon]

@Spardeth its also because of momentum

[Serostern]

@Spardeth Most DC motors have 3 or more poles, there is always at least one pulling.

[selske23]

@Spardeth so, if the motor stopped at exactly that point, would it not work after that?

[igotfacts]

@Spardeth well yeah it picks up momentum as it turns..when the angle between the coil and the magnetic field is 0 degrees and 180 degrees it experiences a couple..causing it to turn by 90 degrees.then the angle between the coil and the magnetic field is 90 and it experiences no force but due to momentum it completes 180 degrees of rotation...and the process repeats itself again and again until the current is cut off.

[fan7994]

wow a brilliant style to make sb understand , keep it up

[fan7994]

wow a brilliant style to make sb understand , keep it up pelletier

[pettrpettr]

stoked!

[sudesh215]

g8t!!!!!!!!!!!!!!

[TheNedian37]

Best explanation!

[mclovinfry]

right hand rule..

[iraimalai1]

very nice

[ntsu22]

thanks, you rock!!!!

[mig189189189]

Awesome video. Keep on with that good work!

[DanFrederiksen]

nice illus. and yes the AV medium is so superior for teaching

[Darrengb]

Great animation

[lacee0]

i am a 15 year old and have always been interested in this i had a small motor(from a cd player) and a cord (one that looks like an O with a hole in the middle) i accidently licked it and found the shock similar to a 9v. so i wired it up and i learned it can run off an outlet or battery . how much danger is involved? on a different note im working on a tesla coil what does the copper wire have to be wrapped around?

[NJRocks281]

For starters stop licking things

The Cord you are describing sounds like a barrel plug it usually goes to an adapter which steps down the voltage, which is why you didn't kill yourself or fry your tongue.

[chickenpoper]

there was probably a transformer to decrease the voltage

[supermanizgay]

is it possible for the electric motor to power itself?

like how a rat can turn on a lightbulb by running in the wheel, only when the wheel turns, it powers the motor to make it turn and so on...

[marcelobesch]

Not really, tough normally that's something that everybody suggests.

There are always losses in the process, so the motor would eventually stop.

If you think about it, it's totally illogical! You are taking away energy from the motor anda putting it back to it. Assuming no losses, it would be the same as letting it rotate freely until friction makes it stop.

[xxjacobxx3]

If you had a motor, battery, and generator, then you could run the motor for a longer amount of time.

The battery, or source of electricity would spin the shaft of the motor. The shaft of the motor could be linked to the generator through a gear, or welded to the generator shaft, etc. A generator is a backwards motor. motor = electricity>kenetic/mechanical energy. generator = mechanical/kenetic/wind/etc>el­ectricity. So the generator would charge the battery. but you would loose energy>heat

[danieledwardgibbs]

@xxjacobxx3 when u say lose energy dont you mean the amount that you wanted in the first place of needing a motor? lol

[musicmaker838]

Animations are SO much easier to understand than diagrams. Thanks for posting this up!

[PelletierPhysics]

Arrows show direction of conventionnal current (from + to -); electrons move in the opposite direction (from - to +). Motion of the electrons is not shown in this animation.

[Krummy2k6]

yeah, it's strange that even though current is defined as dQ/dt, and if Q is (-), the result can expressed as something (+), hence conventioanl current?? Do you know how this originated?

[youbintubinallday]

I think the idea of conventional current is silly, and confuses things. The arrows should be showing the direction of the current, not the direction of + charges that don't really move in the direction supposed, but because it is mathematically equivilant, conventional current has been born. Conventional current should be electrons moving from negative to positive, because that is what is truly going on. There, I vented. Everything is going to be alright.

[goldliquid]

thanks for uploading, really helped alot =)

[bubblycheerchic]

You both are idiots! have you ever taken a science class in your life?!

try googling the gold foil experiment.

:]

[skynet000001]

I thought current goes from negative to positive forward bias

[cappydawg]

electrons flow from positive to negative

[marcelobesch]

No they don't.

[PositiveKinetik]

So true ;) Does anyone have a picture of an electron? We can only think about an electron ;))

[bubblycheerchic]

you can only think about it?

TAKE CHEMISTRY!

[nis915]

i have one. I took it when me and my electron where on vacation we took a lot of pics.

[smetien88]

principe du moteur dc

[shafieque]

very very informative

[danieladamko]

flow of electrons

[yienmei5]

most instructive

[robert0joe]

short but nice

[oskimac]

very educational