Working Magnetic Motor on you tube??

[RunningBare]

I've posted a feature page aat PESWiki.  Feel free to help us compile a good synopsis of this technology as it emerges, including a clear and adequate set of plans, list of replications, theory, data, etc.

http://peswiki.com/index.php/Directory:OC_MPMM_Magnet_Motor

Steorn Forum Members Post Their Own Magnet Motor Demo Video - A couple of forum members have been kicking around ideas for how to build an all-magnet motor with no other motive force.  One of them shot a video showing acceleration of the device, ""but he doesn't seem to realize what he's accomplished.""[/b] (PESWiki; Jan. 5, 2008)

At the risk of speaking for them both, I think they do realize, but thats not the point, it would be very foolish to jump the gun at this point, I for one hope they both keep their feet on the ground and continue to research and experiment before they start shouting OU or similar.
But I gotta admit, I'm very excited about this!

[jox]

kjmagnetics part number B448, which I assume are the rotor magnets, appear to be
magnetized through the thickness. The drawings show magnetization along the length.
Is this the correct part?
http://kjmagnetics.com/search.asp

jox

[Jdo300]

Hello All,

This motor setup looks quite exciting! For those of us interested in replicating the motor exactly like the original, I searched the Steorn thread for a description of the mechanical setup. Here's what alsetalokin posted about the dimensions of his setup:

A dimensioned sketch of the bearing/magnet holder assembly is posted on the other site. The baseplate that I am using is acrylic plastic, 5/8 in thick, 7 3/4 in x 8 1/2 in,
with a 1/4-20 threaded hole in the center for the rotor axle, and 13 evenly-spaced 4-40 threaded holes for the stator magnet bearing holders, on a circle of radius 3 3/8 in centered on the axle.
The rotor is 3/4 in thick piece of HDPE plastic, 2 7/8 in radius, with a 0.500 in center hole bored all the way thru for the flanged axle bearings. Magnets are held in 8 evenly-spaced 1/4 in wide slots, 7/16 in deep, inner edge of slots at the 2 1/2 in radius from center.

This is the basic layout for the 13x8 version that I am experimenting with. But I am mostly just using 3 stator magnets and a couple of "dummy" aluminum pieces of the same size as the magnets, also mounted in the same type of bearing holder.

The stator magnets are mounted by a single trimmed 4-40 SHCS and a little washer to make sure only the inner bearing race is contacting the screw or the baseplate.
The rotor magnets are press-fit in place.

I will draw up a CAD model of it based on the given dimensions and post it for those interested.

God Bless,
Jason O

[Jdo300]

Here's some more misc info I collected from him on the Steorn forum about the setup:

The stator magnets are mounted by a single trimmed 4-40 SHCS and a little washer to make sure only the inner bearing race is contacting the screw or the baseplate.
The rotor magnets are press-fit in place.

The stator mags are mounted coaxially with and above their bearings. The bearings are screwed down to the baseplate with a tiny spacer for clearance. The magnets are diametrically polarized.

These that I'm using now are for 3.5 mm shaft size, in a paired housing that slips into the rotor's central bore, extending down to a shock-mounted base bearing unit.

What I had in there before were just some generic flanged 1/4 inch bore unshielded bearings, and the shaft was a 1/4-20 brass screw. Not the most accurate arrangement.

8 Bearings bought from Stewart-Warner.

The dampers are 6061-T6 aluminum alloy.

The rotor is made of HDPE which is a bitch to machine, and cuts usually come out a little small. I used a 0.250 2-fluted end mill, one pass in width, to cut the slots for the 1/4 in nominal OD rotor magnets, and they press into the slots perfectly--that is, a medium press fit. So if you specify tolerances of +/- 0.0005, which is what I worked to on this project, all should be well.
The stator magnet/bearing holders are Delrin, and it cuts small too, but not as much as the HDPE. I cut for exactly 0.5000, and stopped when the mike read 0.4997. I wanted the magnets to be pretty tight so they wouldn't slip, anticipating the latch requirement.
With the Sherlines, I can always achieve +/- 0.0005 accuracy--they have digital readouts and are very accurate. If I am careful I can get down to 0.0002 in most materials.


Misc Note:

I have little data on variants. If the system works, as I suspect it will, with only the one stator magnet, you might try that first to see if you can reproduce the antigearwise motion, as a start.

The dampers are tuned by trial and error. If too close they retard the magnet too much and it won't synch. Too far and there's no benefit. Once the distance is found, rotating a little at a time and trying the spin until I found a "sweet spot" is how I did it. The effect of the dampers is small, in any case.

God Bless,
Jason O

[jox]

Sorry my mistake, it says the magnets are 1/4x1/4x1/2, the 1/2 being the thickness, which
to me is the length.