Spinning magnets with radio waves.

[synchro1]

@Tinselkoala,

                      Your spinning inside a coil core! Fantastic little setup. State of the art! Astonishing to see it start up from stand still and run up so smartly on sine waves alone. The two series coils remind me of Alfcentauro's up to 300k r.p.m. setup. A tiny precision 1/4" ceramic bearing on a 1/8" carbon axel would take you hypersonic. The 10k+ r.p.m you achieve with that crude friction bearing is still very impressive. 200 hz is nearly 3x's retrod's frequency!  Altogether a very exciting series of record breaking feats.

                       The single precision ceramic bearing costs over a hundred dollars. I just let a neo tube ride free on the one self centering bearing. You'd get ten times the speed! Your bearing friction grows overwhelming at top end. There's a picture of the precision ceramic bearing below:
                       
                       My 1/2" Neo Sphere levitates at high speed. The 1/2" P.V.C. coupling could easily be plugged and evacuated by check valve for silent and safe hypersonic speed testing.

                       Tape a couple of tiny SB pancake pickup coils on each end of the twin power coils, and run the output through a FWBR to a charge battery for "Lenz Free" operation, or place a capacitor in series between fast switching diodes and the output coils to catch  "Lenz Free" output that way. Works as good!. You'll probably test close to a few thousand times OU already..

                        The other thing to remember is that the magnet spinner grows measurably more massive with velocity. This can effect spin factors like bearings and axel friction. Your tiny disk spinner drops off at 180 hz, The frictionless spinner would more then likely keep speeding up like Alf's. He never told anyone what he was up too. I think it's pretty obvious now.. The big difference is Alf's tiny cylinder is very petite, practically worthless for any practical output. Your tiny disk should generate some reasonable amount of output power. Alf must be spinning at 6 khz. Still just speaker blowing audio range.

[synchro1]

Conradelectro is spinning a ring magnet at 8400 r.p.m. for .5 Watt. He's trying to get the highest speed for the lowest input. How can his design efficiency compare with the miniscule amount of power TK's sine wave motor uses to hit 10k  r.p.m. ? Another look at Conrad's circuit schematic. He's sporting four power hungery mosfets and a Hall effect transistor!. A half watt is an enormous amount of power compared to the synchronous sine wave motor consumption TK just tested..

Compare Conradelectro's pulse motor circuit to the schematic for a Wien bridge oscillator posted below it. The Wein bridge's good for sine wave generation between 14 hz and 180 hz, around the range TK used to spin up to 10-12k r.p.m. with his Interstate F43 function generator.. This Wien bridge circuit runs off a 9 volt battery for very little. There's no 1/2 Watt going down the drain with this miniature one op amp sine wave circuit! Frequency's adjustable by potentiometer, and the timing's automatic and flawless!

[TinselKoala]

Well, my power input isn't that small.... the F43 is a powerful FG and I have it cranked right up.  I'm uploading a video right now showing some input power measurements.....

The surprising thing is this: I spin the magnet up to the test frequency and show the scope traces from current and voltage input. Then I stick my finger into the motor to stop the magnet. FG setting isn't changed. The spinner draws _more power_ when the magnet isn't spinning.

Think about that one for a while. I think this is the same kind of evidence (sic) that Steorn used in their initial claim of OU performance in their electric Orbo motor.

Video is still uploading but will be at
http://youtu.be/hdqiUOKLTVs
when it's done, probably in an hour or so.

[TinselKoala]

After I made that video, I took the thing apart and rebuilt the suspension and got a bit better balance on the rotor magnet. This allowed me to attain a new speed record: 19,800 RPM (over 325 Hz), using square wave drive, confirmed with the StroboTac. The video will take a bit of time to upload, probably won't be ready for a couple of hours.

Input power estimation is a lot more complicated with the squarewave drive, but I've got the F43's output turned right up again. It's not especially small.

Later on I'll play around with pulse width. By cutting the duty cycle the input power can be reduced greatly, I'm sure, but it may not spin as fast before dropping out.

I need to make some small pickup coils, yes. But I don't have any fine wire, the #27 is all I've got. I'll have to see if I can scrounge a relay coil or something like that.

[Farmhand]

Tinsel, The spinning magnet must be exerting a counter emf on the coil ?

Synchro, Conrad's magnet that he is spinning is a big one that weighs a bit, it can't be compared to Tinsel's setup,
Conrad's setup can have several generator coils excited by it as well. And his power input is fairly low anyway.

I see not much benefit to spinning just magnets but that's just me, I have nothing at all against it.

But I must say if you think a permanent magnet AC motor is new or novel it is not, they are used in commercial products already, the ones I have
contain quite strong permanent magnets.

I must also say I don't understand why the need for micro power input ? I mean to say we are much more likely to get a gain of a few Watts from a setup that uses tens of whats than we are from a setup that uses MilliWatts. And higher powers make accurate measurements easier.

But I digress the thread is about spinning magnets, I just wanted to say i don't think Conrad's setup can be compared to Tinsels setup.

Cheers