Lasted edited by Andrew Munsey, updated on June 15, 2016 at 1:32 am.
There was an error working with the wiki: Code
There was an error working with the wiki: Code
hydrocontro's replication of the Directory:OC MPMM Magnet Motor
An open source project.
Finally got some shop time.
I know it is not an exact replication. Not sure an exact replication is even possible if Al does not even know the strength of his magnets which will make a difference.
Only have one more stator to make but with just playing with what I have I have formed a couple of ideas of why it may be working. I am not sure how many of you have played with making PMM. My first one years ago was on a 12 inch round wood circle that was 1 1/2 inch thick. I glued a bunch of steel angle iron pieces to a bunch of radio shaft large rectangular ceramic magnets. I was able to get it to spin with another magnet by hand and only moving it about 1/2 inch. I never figured out a way to replace my hand with a mechanical system. I think that is what these round stator magnets do. They pulse the rotor by rotating.
BTW a great way to get it up to speed is with an air compressor wand as some of you have done.
I also found it spins better one direction (CCW) then the other (CW). Not sure why..
Lots of playing to do before I get more shop time. At least it is a start..
I bettered my pathetic machining skills by learning how to use the rotary table for the brigeport mill correctly. Still has some flaws. I had to wrap a bit a tape around a couple of rotor magnets to keep them wedged in place. The stators can stand some improvement. The bearings I used are smooth and rated for 56,000 RPM but you can feel the effect of the stator magnets on them. I think I will try to put a few steel washers under the stator magnet to kill the magnetic field to the bearing. Not sure if it will work but is a easy try. I used a Rubbermaid cutting board for the materials. A roller blade bearing for the rotor. Using a air compressor I can get it spinning fast. So fast I am afraid the magnets are going to fly off. I got a Tach on order. I am also looking at a way to computerize tach readings from a couple of points. This is an interesting project and even if it does not work at least I am improving my machining skills a bit. Still wish I had a CNC machine like others here. Anyway I should have another stator done tomorrow night along with the Aluminum parts.
Well Thanks Sterling... No sure for what. Not going for any recognition effect. Just having a bit of machining fun. Certainly better than what is on TV. A bit jumping the gun there on a write up... I think you are reading more into my posting then intended or deserved. My old wooden magnet wheel I built about 7 years ago. Nothing special. It ran about 100 rpm.. guessing at that as I did not have a tachometer. Used Radio Shack ceramic magnets that cost a buck apiece. Those ones are pretty strong. Had around 25 or so bolted to the top of the wooden wheel. Looked like Stonehenge on top of a wood disk. It ran as long as I pumped it by hand with a 4 Radio Shack magnets stacked up. It did not accelerate. Well it did if I pumped it faster. Gets kind of tiring pretty fast. No video as I did not have a video camera back then. I may have a picture somewhere. Like I said . Nothing special. No precision workmanship. It is what you do with a 2x14 about 5 foot long, a pencil compass, a saber saw. a couple of Ace Hardware flanged bearings, a big bolt to go through the bearings, twenty 1 inch angle iron, a bunch of glue and a box of wood screw. Basically something to learn from.
My current replication.. Well I was playing around with the air gun driving the main rotor and I guess (no tach yet. on order) it was going around 1500 RPM. It was really whining. So fast that two of the magnets are now 'lost in the shop'. WARNING.. DANGER Will Robinson this setup can make serious and harmful projectiles. There is a big dent in one wall where a magnet hit first. After that I heard it bounce around. I suppose it is stuck to some machine here. As your mother told you.. You can put an eye out with that thing. Once again I was driving it with an AIR GUN to see how fast it would go and how balance it was. It was doing really good. Hindsight.. a little stupid.. okay.. a big stupid. Luckly I ordered 10 so I still have a couple replacements. No acceleration.. No video of my stupidity. I'll get there.. patients please..
In my 'primitive' and 'not exact' replication I have noticed a few things.
1. The effect appears to be real. There is a very apparent syncing effect that 'as it happens' appears to keep the rotor at a steady speed for at least a couple of seconds. I still have to 'learn' how to do video but mine would still pale in comparison to this one already posted. This effect can best be seen in
OS:MPMM:Replications:CLaNZeR video CLaNZeRSLatch4.wmv at http://www.overunity.org.uk/
2. Is going to be extremely hard with this setup to find the 'right' combination of magnet strength, location, friction, bearings, mass of rotor, mass of stator, etc. I have only two lengths of rotor magnets to play with .5 and .75 inches. I think Al's are somewhere in between. I would hazard to guess that even Al would have a hard time making a working second one.
3. Is not going to be 'slap it together' and it will work system. I am not saying that what Al did was a fluke and not reproducible. I am saying that it is going to be a 'real bear' to get one working so it may take weeks-months of playing to get another one running. Of course someone may have one running tomorrow Doubt that it will be me
OS:MPMM:Theory > The “90° Rule? Theory by Jason Owen. "In this document, I will be presenting my findings with what I call the 90 degree rule. My conclusions are based on my own personal experiments and observations, as well as simulated data, patents, and information presented by Tom Bearden relevant to the subject." (September 18, 2005)
hydrocontro - profile at OverUnity.com