Confirming the Delayed Lenz Effect

[conradelektro]

Hi Conrad, I see you use photo interrupters/switches as well. Some circuitry can be arranged to give manual pulse width control with a pot (independent of the trigger pulse width), as well as retriggering to accelerate up to speed as a Bedini type setup does. I put some drawings in the COIL FOR ELECTRO-MAGNETS thread, I've put together a very simple new frame, rotor and coil assembly so I can refine the circuit.

I wonder is there a more appropriate thread for discussing just basic pulse motors and the driving arrangements of different kinds. Would be good to pool idea's.

I'm not sure where to post about pulse motors and their driving circuits. 

Nice work by the way.
Cheers

P.S. Does anyone have a 3D rendering of the magnetic field shape of a diametrically magnetized tube magnet ?

..

@Farmhand: I saw your circuits in the COIL FOR ELECTRO-MAGNETS thread. Interesting, so many ways to do it. Yes, we should share different concepts and designs. Why not post your design in this thread. Everybody who wants to test "magic generator coils" needs a way to drive the rotor or magnet spinner. Specialised threads run dry very soon. This thread will stay alive till people stop claiming "magic generator coils" which will last a few more months.

Remark: I know, one could turn a magnet rotor with any conventional motor, even by hand. But building ones own drive circuit and method is more interesting.

@TinselKoala: I am intrigued by your  Marinov Slab. What is N3L violation? Does the rotor have magnets? What is the drive principle? May be you can point to some information. Any way, it looks awesom, probably alien technology which you hide from the world. But the men in black will get you or we will steal it from you.

I want to point to a motor driver principle described by DadHav http://www.youtube.com/watch?v=8b4xlCKn3LQ (John Havrilla). It does not need any trigger, the drive coil itself is the trigger. I only post the most simple version for one drive coil (please watch the video, great ideas). DadHav drives a window motor from a capacitor for a long time. I have to try that with my ring magnet spinners. May be it works with MOSFETs (the base has high resistance, no resistors needed, Q6 is doing the driving, Q5 the sensing and triggering).

Greetings, Conrad

[Farmhand]

I see your point Conrad, Pulse motors circuits, novel generator coils and fancy coil shorting circuits go together.

Please forgive the frame ect. I just whipped it up from three pieces of wood and some screws. The main thing is it runs very smooth and stable so seeing differences will be fairly easy. I do intend to build an improved version after I work out some things, at present the magnets are quite far from the core and there are only two magnets north pole out, diametrically magnetized neo tubes 12 x 12 mm. I'll set up a gen coils to try with this type of rotor. The two boards on the left are unused as yet except for circuit supply voltage regulators.

http://www.youtube.com/watch?v=_Sv539Nxfek

I wanted a circuit setup with adjustable pulse width while the motor is running, the re-trigger is mainly there for coil shorting/load switching experiment purposes. 

The external shutdown if pulsed from the picaxe should be able to limit speed or shut down when a low supply voltage level is sensed ect.  The picaxe can run boost converter for input voltage control, and switch loads maybe.

Drive pulses about 3 mS in the video. RPM about 1380 or so.

[conradelektro]

I see your point Conrad, Pulse motors circuits, novel generator coils and fancy coil shorting circuits go together.

Please forgive the frame ect. I just whipped it up from three pieces of wood and some screws. The main thing is it runs very smooth and stable so seeing differences will be fairly easy. I do intend to build an improved version after I work out some things, at present the magnets are quite far from the core and there are only two magnets north pole out, diametrically magnetized neo tubes 12 x 12 mm. I'll set up a gen coils to try with this type of rotor. The two boards on the left are unused as yet except for circuit supply voltage regulators.

http://www.youtube.com/watch?v=_Sv539Nxfek

I wanted a circuit setup with adjustable pulse width while the motor is running, the re-trigger is mainly there for coil shorting/load switching experiment purposes. 

The external shutdown if pulsed from the picaxe should be able to limit speed or shut down when a low supply voltage level is sensed ect.  The picaxe can run boost converter for input voltage control, and switch loads maybe.

Drive pulses about 3 mS in the video. RPM about 1380 or so.

@Farmhand: For such a big rotor your machine really runs smoothly, well balanced.

Not a criticism, just a statement. With about 13 Volt you are using about 0.4 Ampere, which calculates to about 5 Watt. This is a value I see with most pulse motors of the size like yours on YouTube.

I think we should try to get the power demand down. Torque is not an issue in case one believes in finding a "magic generator coil" that produces electricity but does not slow the rotor down by much as e.g. SkyCollection shows with his magic pancake coil.

In case one just wants to spin a rotor (and is not concerned about torque) the mechanical factors are dominant (bearings, balancing the rotor).

Pulse motors are very weak (little torque for the Watts put in), but they could be very efficient if one just wants to spin a freely rotation rotor (which does not have to produce torque). But then the drive circuit becomes important. And this is what I am working on.

Greetings, Conrad

[Farmhand]

Yes I agree Conrad, The input power is too high, the rotor magnets need to be a bit closer to the drive coil core, and the drive coil itself is just a test coil I had laying around, I didn't even bother to remove the diodes that are attached to it, so I drew them in the drawing hehe. I need a better coil and core which I'll do before I try a closer magnet placement. I don't want the drive core too close to the magnets since they are neo's. I'm thinking of using three drive coils in series, one where the one is now and another at each side in just the right place to pinch the north pole of the diametric tube, I had a probe around with a generator coil and there is a very strong field point just to the sides of the north side of the cylinder. I'll post a drawing very shortly of what I mean. That should give the best squeeze for the power. Really put the pinch on the magnet.  Hoping then the drive pulse can be shorter.

The way it is now the field of the drive coil seems to be just bumping the rotor magnet field. And doesn't exert the correct balance of repulsive force for input power because of the distance being a bit too far..

The tube magnets I think have distorted shaped field and I think the field lines go across the hole to the south pole at the edges. I'm thinking for gen coils it could allow for some different effects as well.

Getting the drive power down with good rotor speed is important I think. Thanks for the input.

Oh and I think the mosfet I'm using is damaged by current through my own misadventure. It's getting warm when it should be cold and the wave form looks off on conduction.

Cheers

[conradelektro]

I now have a comparison between the black and the white coils used in Version 2 of my ring magnet spinner. One sees from the measurements that the black coils have about double efficiency in comparison with the white coils (see attached picture).

Version 2 has mechanical problems, the ball bearings drag. But this drag is the same for the white coils and the black coils, so the comparison is valid.

I will give the ball bearings an acetone treatment and will tray to repair the rattling of Version 1, because Version one was very much more efficient than Version 2 (in terms of rpm per Watt).

Of course, when just free spinnig a ring magnet power draw depends very much on the mechanical friction of the set up. But the drive coil (I recommend a coil with a lot of windings i.e. high DC resistance) and the circuit (which I still try to advance) are also important factors for the power draw.

My aim: spin a ring magnet with very high rpm and very little power.

Greetings,

Conrad