Simple DC Motor Explained

The physics of and how to construct a simple DC motor by first year engineering students.

Electric motor to lift coins by Peter Hayes

[benebutterbean]

Holy Crap: You have three hands!!! No wonder you can do such marvelous things...

[allanalbrecht]

This video could be really useful if I could understand what he's saying. Maybe invest in a good microphone.

[lorddedede]

I tried doing this and the coil got too mighty and ended up murdering my entire family.
6/10 pretty good tutorial

[TheSonicChaotix]

Why do I find this unintentionally funny? I don't know, your voice just has this weird charm to it. It's funny.

[UnScriptedFlix]

This is a rather old video, but nonetheless, I believe you meant to say this is an example of Lorentz force. Faraday's law of induction states that a voltage will be induced in a winding present in a changing magnetic field.

[RoamingHazard]

Correction 1: "A DC motor works by Faraday's Law of induction". Not true. This is a motor, not a dynamo. It is based on Lorentz force, F=Q(U x B), which is the force exerted by a magnetic field on moving charges, which is why this motor is also referred to as a Lorentz-force motor. Or, it can be explained more generally by attractive/repelling forces of two magnets, where the current coil acts as the second magnet. Here is a video that explains this correctly:
Correcton 2: “Faraday’s Law states that a circuit with current in it creates an electromagnetic field”. Nope. Faraday's Law states that a time-varying magnetic flux through a wire loop will induce voltage in the loop. It means that you can create electricity by moving a coil in a magnetic field (i.e. a generator), while this video shows the opposite effect - sending current through a loop of wire makes it rotate (i.e. a motor). In other words, here electricity is converted to mechanical energy, while Faraday's Law has to do with converting mechanical energy to electricity. BTW, the laws that actually explain why a circuit with current in it creates an electromagnetic field are:- Coulomb’s Law and Gauss's Law for E-field, and - Biot-Savart’s Law and Ampere's Law for B-field, all of which are unrelated to Faraday's Law.

Also, stripping the wire all around the circumference is not optimum. If current goes through the coil during every rotation, then during one rotation the loop will be pushed one way, and in the next rotation it will be pushed the opposite way. This means that your rotating coil is being slowed down every other turn. Only half of the circumference should be stripped, so that it conducts current every other turn. Just a suggestion.

[janikdominik]

Is it normal that it speaks to me, after the battery is connected?

[brettanon]

this video demonstrates great use of a microphone

[sventhebest]

a simple but efficient explenation... its perfect

[tharangaarai]

Thanks a lot to upload this video!!!It was so helpful!! Cause I have a project on Motor ;)

[samyak]

the idea of shaving only front face of both side was amazing!!

[bernadictbernard]

I have to design a motor and one of the specifications is that the motor has to be able to lift a coin to a height of on at least 15 centimeters. would this same design be able to do that?

[budddmj]

this video is so chaotic. from the audio quality to the sped up footage. but non-the-less it enplanes everything.

[Vivenk]

Its important for the windings in the coil to be insulated from each other right?

[hafizimohdnoor]

Hello sir, may I ask? 
What I found about this video is the copper coil is rotating because there is an electricity from the battery and caused by the magnetic fields. If you're not concern, can you explain it to me i simple way. 
And what is the uses of this principle in our daily? etc dynamo can use to light a bulb.
I'm really hope you reply because I need to make a report.

[nataliebaker]

Can the motor change direction or change speed due to interaction?

[phskw]

May I ask why this dc motor doesn't need a commutator?

[webstennisfree]

hey i like the video...what rating of battery did u use? does it work for 1.5V TV remote batteries??? Also why did u rotate winding initially to make it run? So it wont start if u dont rotate it initially? .... A short-circuited winding might be dangerous to the battery but nothing happened in this video. I expected a burn-out of battery...Can u tell me how does this work? Why does it rotate because DC from battery is constant not like unidirectional pulsated DC which varies in magnitude time to time like a positive half sine

[lucyx]

Hi,
So for the DC motor, it is not spinning in a continually in one direction but going back and forth really fast right?

[dummyacc]

are there any specifications on the kind of magnet we need to use?