# Simple Homopolar Electric Motor

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## Introduction: Simple Homopolar Electric Motor

Here's a video I made a while back. It has had some pretty amazing popularity around the web and I thought I might as well include it here. It is not unique, but hopefully the video is helpful to some of you.

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## Questions

i tried this thing but it dose not won't to work!!!!!!!!!!!!!!!

Did u get a neo magnet, copper wire, and a fully charged battery

.....can you please give me a website that I can Buy a Magnets

2 replies

Hobby lobby and Lowes

Ebay.com - neodymium magnets round

There is no explination as to how this works. It is actually a small phenomenon

It is a phenomenon, though not so small in my opinion. Any way the motor works just fine and fancy it is.
Phenomena of this kind have been described by physicists and electrical engineers for some decades. One wikipedia entry could be Force on a current-carrying wire . The formula which describes the force in case of a straight, stationary wire shows that the force is proportional, among other factors, to the current. In this case the current is significant, since it is a short-circuit current. This example of electrical engine is cute and fancy. Watching the video was great fun.
In the pictures below I tried to draw the model and the circuit.

Can you use any kind of wire that is atracted to magnets?

3 replies

No, use copper wire (not ferromagnetic) and a neodynium magnet with the silver metallic coating. The magnet has to be conductive and the wire has to NOT be attracted to a magnet.

is it okay if the neodyium magnet is small?

Yes, in fact the video has a link to another version of teh motor that uses a very small magnet. I guess there is some limit to how small the magnet can be.

So I am about 90% sure this is what is going on. What you have is a current that is flowing. Any flowing electric current produces a magnetic field and the the same way a moving magnetic field produces a current.

What is happening is that because the wire is coiled in a spiral, it is creating a magnetic field that is at an angle to field of the magnetic field of the magnet. This creates a force which spins the wire. Because turning the wire turns the magnetic field, it keeps on turning.

You could test this by 1) Reversing the turns to see if it reverses. or 2 Reversing the magnet which should also reverse it. If it's just "running away" then the magnet direction shouldn't matter.

2 replies

Just thought about it one more time, and reversing the coil won't work, but reversing the current, or the magnet will.

Except the copper doesn't have to be spiraled to work...

does it hav to be copper wire?

Q: Why it works? A: Easy, You're a witch! ;)

4 replies

but how do you KNOW he's a witch?!

wouldnt he be a wizard

go watch monty python and the holy grail....then you'll get it

oh i feel stupid now, ive seen the movie i just was kinda "vegged" out when i red it... wow