Has anyone seen Lasersabers new motor runs on 1000uf cap

[Magluvin]

Looking it over again, he blew with the straw and said it really makes the voltage go up fast. Well I would think so. lol  But it also speeds up faster. But after the speedup, he drags it down and then it accelerates, probably due to the cap being charged.

But still, what is that a 10uf cap at 100v. This is just insane!!!  lol
The germanium diode. I suppose it conducts both ways, if the cap is discharging and recharging and it is in series with the cap.

He posted specs at his forum.

Mags

[conradelektro]

Gyula, thank you for your comments.

Today I tried with the ALD110900, and it was a failure.

Attached is the circuit and a scope shot with the ALD110900. The rotor stopped turning, even with 7 Volt power supply. The power draw was very little, about 70 µA.

(The circuit diagram does not show it, there was a diode over the drive coil to clip off the back EMF spikes, as one can see in the scope shot.)

The trigger coil idea seems to be not very good, I will use a Reed switch like Lasersaber. But it will have to wait till next week.

Greetings, Conrad

P.S. http://www.overunity.com/13523/has-anyone-seen-lasersabers-new-motor-runs-on-1000uf-cap/msg361696/#msg361696 this was my test with the 2SK170

[gyulasun]

Hi Conrad,

If you feel like to return to the 2SK170 again till the reed switch arrive I edited your schematic to include a potmeter, a resistor and a 1.5V small AA or AAA or a button cell battery to insure a negative bias to the gate of the JFET so that it should be just OFF at its pinch-off gate voltage or slightly beyond it.  And the induced trigger AC voltage will control the gate whenever the algebraic sum of the DC and AC voltages fall into the conducting range of the JFET.  (it is possible you may have to use a 3V battery or two 1.2V batteries in series.)  This negative bias does nothing else but helps the JFET return to its OFF state from its ON state whenever it is needed but the induced AC trigger voltage changes slowly in amplitude (not rectangular but sinusoid-like).
This way you may be able to improve the run time of your setup considerably.

I guessed the ALD110900 test would be worse than the JFET test (it has a much higher ON resistance than the JFET).
Thanks for showing the results.

Greetings
Gyula

[conradelektro]

Gyula, thank you for editing the circuit, I will try that.

I could quickly test the motor with a Reed switch. See the circuit diagram and the photo. Still, much more power draw than Lasersaber reported with his first 3D-Printed Motor (the one with the six coils).

May be Lasersaber`s coils have a higher DC resistance than 90 Ohm?

The Reed switch seems to be "ON" for too long (almost 50% of the time). I have to make an iron shield (slit) in front of it, to limit the ON-time when a magnet passes. Or I have to place it at a better position in respect to the passing magnets.

I tried a 5 K Ohm resistor in series with the coils. This limited the average current draw to about 90 µA at 1 Volt supply Voltage and the rotor still turned slowly. But it is stupid to burn the energy in a resistor. There should be 5 K DC Ohm worth of coils.

Greetings, Conrad

[Farmhand]

Hi Conrad, excellent work and investigations, the speed with which you made a replication is remarkable. Well done, very impressive. We need more folks like you and LidMotor who can whip up a very good replication in quick time to test things out, and say it as they see it. I agree about the resistor. And I also see the DC resistance of the turns as avoidable loss, to restrict the current and keep ampere turns without the DC resistance I think we can use more inductance, shorter "on times" and more voltage if necessary. One of the reasons I don't like to use small coils is that to get enough turns the wire needs to be thin and so the DC resistance is relatively high, which wastes energy as heat.

If we adjust the "on" time while the coil is in use we can adjust the "on" time so that because of the inductance the current restricted, but if the "on" time is too long the coil gets enough time to act as a conductor with just DC resistance. The frequency of the input "on" times is also a factor there.

Two motors side by side one has 20 Ohms DC resistance in it's motor coils and the other has less than 1 Ohm DC resistance in it's motor coils both have the same inductance and are adjusted to an input of 10 Watts from the same potential supply, which one wastes more energy as heat ? Seems obvious.

Cheers