Self accelerating reed switch magnet spinner.

[TinselKoala]

The links to the levitators originally came from synchro, lots of neat stuff in there but only the "visual levitator" that I mentioned above is unique in its operation, and low-powered.

Your vertical spinner could probably be stabilized by a pair of magnets in attraction on the bottom end, one on the shaft and one on the base. You'd have to adjust the spacing carefully because these magnets would be aiding "gravity" in pulling the shaft downward, but should provide a "cone" of magnetic attraction that would keep the bottom of the shaft from wandering sideways.

Looking at the map of field lines in the horizontal suspension system, you can probably guess that larger diameter suspension magnets, both on the base and on the axle, would help stability of that system. A "pulling" pair on the opposite shaft end from the point contact might also help, as I suggested for the vertical system.

[synchro1]

@Conradelektro,

Two diametrically opposed power coils, one reverse wound and wired in parallel with the other, both pulsing simultainiously on each side of the vertical dipole rotor would steady it.

@Tinselkoala,

A quote from the visual levitator thread,

¨The system, developed by Nabeel Shirazee for Magnetic Suspensions Ltd, uses powerful permanent magnets supplemented by electromagnets controlled by electronics circuits. The movement of the levitated mass is tracked and the current constantly adjusted to correct any movement, a system that means large masses can be levitated with very modest currents¨.

The Shirazee design coupled with a heavy version of Lasersabre´s 3D precision multimagnet rotor and symetrical pulse coils would allow a comparator circuit along with it´s unique timing feature to really accelerate the rotor to fantastic rates of speed with very high efficiency. It might be possible to evacuate such a setup too.

[synchro1]

A piece of clear plexiglass pipe could be cut to size and covered by a circular piece of plexiglass on one end, to house the levitated rotor and protect the experimentor from shattering. The spoked power and output coils could position outside the container. This would allow for a large heavy rotor of perhaps eight or ten inches in diameter with a load of very powerfull neodymium rotor magnets, along with the supension magnet on the top. A 3D precision rotor frame closely toleranced to the plexiglass would spin true and safely at very high RPM´s inside this kind of evacuated chamber.

I managed a self runner following the principle that magnet strength increases the rotor velocity per given unit of power coil energy. Output coil Lenz drag can be lowered or eliminated as we´ve seen with serial bifilar pancakes at Lënz delay threshold RPM. This Sirazee design evacuated rotor build would beat Skycollection´s device. 

[conradelektro]

I tried to stabilise the hanging spinner, but the interference of the big diametrically magnetised cylinder magnet with whatever magnets I place at the bottom is very strong. The axis should be very long to create some distance, but with a long axis the horizontal placement seems to be much more practical and stable.

Also two drive coils at 180° for the hanging axis do net help, because they do not define a clear middle position, one is always a bit stronger. Like with levitation, one would need some electronics to centre the axis.

I think I have now figured out a good combination of axis length and magnets for a horizontal spinner, I just have to get a 250 mm  long 3 mm diameter axis, I used up all I have got for shorter pieces.

One could of course build all sorts of very nice spinners, but for me it has to be something that is possible at home with ordinary tools. Vacuum is beyond my reach, also very precise workmanship is not my strength. I am getting better at it, but there is still a long way to go.

I did a new vertical needle bearing with a magnet near the top to hold the axis straight up (a 230 mm long steel needle). It was very easy to build and spinns nicely. It is intended for an electrostatic motor. For me a needle bearing with a vertical needle and a magnet near the top seems to work best.  This is something I can handle. I could of course build a vertical magnet spinner with a long needle, but the needle being steel would cause again some magnetic disturbances.

The very long steel needles are called upholstery needles: http://www.ebay.com/itm/Dritz-Silver-Various-sized-Metal-Upholstery-Needles-Pack-of-Four-/350949938097?pt=LH_DefaultDomain_0&hash=item51b63f13b1 (If you look around, you can get them for a reasonable price).

Greetings, Conrad

[conradelektro]

I built a new horizontal magnet spinner.

The axis is 270 mm long (3 mm diameter) and the spinning magnet (in the middle of the axis) is 15 mm long (15 mm diameter, 3 mm bore hole).

Because the axis and the spinning magnet are much heavier than in my previous models, the power demand has risen to about 50 mW (12 V, 4 mA).

The axis turns at about 2000 rpm; 3000 to 4000 rpm are possible (60 mW to 70 mW), but I have to work a bit on the axis, it is not completely true and starts to wobble at higher turn rates.

The magnetic interaction between the spinning magnet and the base magnets (at both ends of the axis) is small (because the axis is long).

I will now concentrate on the electronics for spinning the magnet. For the first tests with the new horizontal model I still used the circuit from this previous post http://www.overunity.com/13852/self-accelerating-reed-switch-magnet-spinner/msg378616/#msg378616

Greetings, Conrad