btw, it seems pointless to question such basic 101 electronics equations such as I = V / R, V = I * R, P = I^2 * R. To do so would mean one could not even trust a simple digital multimeter.

...
Well, after spending days doing scope measurements, I've already satisfied myself that the calculations are correct and accurate enough. Although of course there could be errors, but I'm past that, to the point of now working on making a self-runner that will operate from a relatively small capacitor. Batteries not allowed! 

It is the best method. Only an obvious experiment can definitely close such a discussion. Good luck!

I received my Enermax Marathon PC fan that according to the ebay ad is supposed to be "friction-free" due to magnets.  What a waste of $8!  -->

http://globalfreeenergy.info/2010/02/01/enermax-marathon-pc-fan/

I received my Enermax Marathon PC fan that according to the ebay ad is supposed to be "friction-free" due to magnets.  What a waste of $8!  -->

http://globalfreeenergy.info/2010/02/01/enermax-marathon-pc-fan/

Hey Paul, I wonder if your latest circuit would work driving my four toroids in series?  Any thoughts?

Thanks,

Bruce
http://energyfreedomreport.com

Hey Paul, I wonder if your latest circuit would work driving my four toroids in series?  Any thoughts?

Thanks,

Bruce
http://energyfreedomreport.com

It depends on total inductance of all four toroids when they are well into the saturation curve, and your machines rpm. The circuit takes the energy put into the toroid and uses it sustain the current pulse as the magnet moves away. Well, at least it supposed to maintain the current. According to LTspice I should expect ~ 10% decay in current at 15,000 rpm with one toroid, and possibly less decay with two toroids. The circuit is for high rpm designs. I know, Sean says the current needs to be constant, but I don't buy that. Well see about that with my new design. 

Thanks for the link. Those are active magnetic levitation  bearings. Do you know where to buy passive magnetic levitation bearings?

Btw, the ones in the $8 fan are by now means magnetic levitation bearings. It's just a marketing stunt.

One idea is to just get a ring magnet where the magnetic field goes inward, and get another another smaller ring magnet where the field goes outward, place the smaller ring magnet on a plastic rod, make another inner / outer ring magnet and place that at the other end of the rod, and you have a passive magnetic levitation bearing!     Problem is, where do you buy such ring magnets.

Thanks for the link. Those are active magnetic levitation  bearings. Do you know where to buy passive magnetic levitation bearings?

Btw, the ones in the $8 fan are by now means magnetic levitation bearings. It's just a marketing stunt.

One idea is to just get a ring magnet where the magnetic field goes inward, and get another another smaller ring magnet where the field goes outward, place the smaller ring magnet on a plastic rod, make another inner / outer ring magnet and place that at the other end of the rod, and you have a passive magnetic levitation bearing!     Problem is, where do you buy such ring magnets.

I found these ring magnets in the automotive section at Wal-mart. It is packaged as a 6" magnetic parts tray with a rubber case to protect the magnet and to prevent marring of surfaces, for less than $6.00 each.  The ring magnets are axially magnetized.  You still need the smaller ring magnets, but it shouldn't be a problem to find some to match the dimensions of these larger ring magnets.  If it doesn't work, then you'll have the ring magnets for other projects.


GB