A Simple Homopolar Motor

Introduction: A Simple Homopolar Motor

A motor with only a battery, wire, and magnets.

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Step 1: What to Get...

The things that are needed:

C or D cell battery(almost any store has it)
26-20 guage solid wire(from almost any hardware store)
Magnets-really strong kind(from ORVAC or any store like that)
Compass-To find north of magnets(from...)

Step 2: The Wire...

Bend the wire so that its in the shape of a square... like so...

Step 3: The Magnets...

Put the magnets so that there all facing north. You can find north with the compass. Put it in order in the picture as shown.
The big magnets are on the bottom and the top of the magnets are facing up and the polarity is facing north. The wider magnet on the top is to hold the wire in place and have better connectivity.

Step 4: Putting It All Together.

Put the wire(hole side down) around the magnets to let it spin freely with the top touching the neg. side of the battery.

Step 5: Collabrating Time...

Make sure that the wire sits on a dipple of the top of the battery and also make sure that the bottom of the wire is touching but can still spin. The wire has to spin freely with no or little friction to achieve maximun results. Callabrate it till it can spin and keep on spinning. Notice that the battery is ballancing on the magnets. The battery never moves nor the magnets, the wire will move rapidly by itself.

Step 6: Problems and Difficulties

Make sure that the battery is fresh, the magnets are north facing up to the battery, the wire can spin freely while touching the magnets and the neg(wire connecting pos. to neg.)
I attached a video of the motor.
Hope it works... Its my first instructables...

Step 7: How It Works.

The magnets are constantly attracting and pushing the wires which are magnetized becuase of the eletricity running through it, thus makes the wire turn...

You can put it on the side and if its strong enough... It can roll forward or backwards, it depends.
For more information visit:

For more projest please visit:

I hope you have fun.

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    11 Discussions


    Reply 9 years ago on Introduction

    sry about the pictures, account got stolen, and pictures deleted...


    When I did this I just got the magnets from those stacking magnet toys. Soaked them in acetone for a while and they fell out. Works great.


    oh ya... just to say that im still 13 and im not a middle age man that's a mamas boy or that i like watching movies that are under pg-13 movies.


    Ya i was watchen that when i was makeing it. Thats why the pictures are dark becuase my mom sleeps through movies sometimes and if i add flash or put on more lights and then my mom will say go to sleep. There was nothing better that was on to.lol


    I got those magnets in ORVAC. they have lots of magnets but only three kind of supermagnets. I got the long magnet from MAGNETEX. i used the long magnet and the minimagnet just to hold the wire in place. I recently tried to use thicker wire but the wire just stuck to the magnets. There like $5.00 for 6 big one in the picture. $5.00 for 12 minimagnets in the picture at the top. Im trying to make a H-bomb after this. Ill try to post it the fastest i can. P.S. like a month or too.


    13 years ago on Introduction

    So I'm thinking that this requires magnets that aren't coated in plastic... Darn! All I've been buying recently are plastic coated, (I got tired of them snapping together and breaking).


    13 years ago on Introduction

    I saw this here before
    <object width="425" height="350"><param name="movie" value="http://www.mojoflix.com/mojoplayer.swf?scale_it=1&autoStart=0&no_skin_menu=1&popup=1&video=http%3A%2F%2Fwww.mojoflix.com%2FSWFParams%2F15847%2FEmbed%2F%3F"></param><param name="wmode" value="transparent"></param><embed src="http://www.mojoflix.com/mojoplayer.swf?scale_it=1&autoStart=0&no_skin_menu=1&popup=1&video=http%3A%2F%2Fwww.mojoflix.com%2FSWFParams%2F15847%2FEmbed%2F%3F" type="application/x-shockwave-flash" wmode="transparent" width="425" height="350"></embed></object>
    They have some pretty weird shapes for it


    13 years ago on Introduction

    I tried this before, I could never get mine to work because I had a cruddy little fragment of a super magnet and just kind of gave up on it