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Overunity Machines Forum



Bob Boyce TPU thread

Started by hartiberlin, July 26, 2007, 12:03:41 PM

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eldarion

#150
October 03, 2007, 08:52:34 PM
Hi Bob,

Nice control board there!

I just received the properly wound core from Bruce, and have been attempting to fire it up in low-power pulsed mode.

I cannot seem to get the HV secondary bias to have any effect on the load resistor, however.  In addition, there is very little power coming out (on the order of milliwatts).  I don't think this is right! :D

Would you mind offering some advice here?  I am not sure where to proceed from this point.

I found a resonance at ~7.6KHz, which I believe is the secondary winding resonance.  (It changes when the load capacitance changes) 
Is this the resonance you are talking about when you say to multiply the resonant frequency by 1.5?  The primaries resonate up in the hundreds of kilohertz.

I am using 500ns pulses at about 10KHz.  When I varied the phase from 120.0 degrees to 120.1 degrees and above, nothing happened.  What am I looking for when I vary the phase?  A jump in power output or something else?

Will the effects occur at any reasonable frequency, or do I have to find a specific resonance before I can expect to see anything?

Will I be able to see some low-power effects without magnetic bias applied?  From what I understand, the magnetic bias merely aids in the control of the unstable rotational operation mode, and therefore shouldn't be needed just yet if I am running pulsed mode.

You can see my output waveform over in my thread if you like.  That waveform was taken across a 470-ohm resistor with a DC blocking capacitor between it and the secondary winding.  The other end of the secondary was connected to ~80V.

Sorry for all the questions! ;)  I just can't help but feel that I am missing something obvious here...

Eldarion

"The harder the conflict, the more glorious the triumph. What we obtain too cheaply, we esteem too lightly; it is dearness only that gives everything its value."
-- Thomas Paine

Bob Boyce

#151
October 03, 2007, 11:18:48 PM
@Eldarion

Without seeing how you are connected and what you are doing, I would only be guessing. Every time I tried to load the newest posts from your thread, the browser locks up. I tried about 7 or 8 times and it locks up my browser every time. I guess it's because I'm on dialup and the scripting for images is locking up when it takes too long to load.

Have you tried using a light bulb as a load on the secondary with a DC blocking cap?

Bob

eldarion

#152
October 04, 2007, 12:59:21 AM
Quote from: Bob Boyce on October 03, 2007, 11:18:48 PM
@Eldarion

Without seeing how you are connected and what you are doing, I would only be guessing. Every time I tried to load the newest posts from your thread, the browser locks up. I tried about 7 or 8 times and it locks up my browser every time. I guess it's because I'm on dialup and the scripting for images is locking up when it takes too long to load.

Have you tried using a light bulb as a load on the secondary with a DC blocking cap?

Bob

Bob,

No, I have not yet tried a light bulb--I was using a standard carbon-film resistor.

Bruce brough up a good point to me--the pulsed mode is only for the hydroxy generator. correct?  He has suggested that adding the magnetic bias may allow the system to operate in the first place, which will be my next test.

If you like, I can E-mail you pictures of my setup.  They are relatively small, around 100k or so each.

Thanks!

Eldarion
"The harder the conflict, the more glorious the triumph. What we obtain too cheaply, we esteem too lightly; it is dearness only that gives everything its value."
-- Thomas Paine

eldarion

#153
October 04, 2007, 03:29:49 PM
Well, I just tested the magnetic bias at several amperage levels, ranging from 10mA to 5.2A.  No joy.

I am really quite puzzled by this.  Is there a minimum load impedance required for the system to operate?

I am using a 220uF 100V DC blocking capacitor and a 470-ohm resistor.  (I had been using a 0.22uF cap., but I realized the impedance at 10KHz was over 70 ohms--not very good!)

The only thing I noted was that if I connected one end of the magnetic bias coil to ground, and left the other end open, the magnetic bias coil would resonate and superimpose its oscillations on the secondary output.  I didn't think that would happen, as the magnetic bias coil is wound at 90? to the secondary, there should be no magnetic coupling whatsoever.

Which coil am I supposed to resonate?  The primaries or the secondary?

I was thinking about the operational principles involved here--are we literally allowing one primary coil pulse to travel at some velocity in the core, and firing the next coil in line just as that travelling impulse hits that next coil?  If that is the case, then we need to operate the coil at a much higher frequency than 10KHz base!  From my measurements on this coil, the intercoil travel time is on the order of hundreds of nanoseconds.

I have attached a schematic of the coil end of my setup; I tried to keep the image size small so that you won't have problems loading it on dial up.  The pulse generator right now is generating the 1-2-4 frequency stepping at 120.0 phase 2 and 240.0 phase 3 (variable phase).

I can also attach the scope shots of the primary drive signal if you want.

Thank you again for helping us with this technology!

Eldarion

EDIT:  Arghh!  I just compared the waveform you gave me earlier with the actual waveform coming out of my pulse generator, and the red pulse (frequency 2) is in the wrong spot in the grouping that has the missing pulse!  Could this mess things up badly enough that the effect will not manifest?  See attached waveform picture)
"The harder the conflict, the more glorious the triumph. What we obtain too cheaply, we esteem too lightly; it is dearness only that gives everything its value."
-- Thomas Paine

eldarion

#154
October 04, 2007, 09:54:07 PM
Bob, All,

Well I was able to fix my pulse generator, and the first thing different that I noticed was an odd pulsating if I monitored the input signal to the second-frequency primary coil.  The pulsing was not present on the MOSFET gate drive signals, nor was it present on the earlier, incorrect version of the pulse generator.  Also, it changed frequency if I put my hand near the coil, and disappeared altogether if I disconnected just one of the primary drive signals.  It is very unstable, sometimes oscillating so fast that I cannot see it, and often drifting in frequency by itself.  Applying HV bias drive did alter the frequency of it (sped it up considerably, but did so slowly, kind of like a turbine...)

It is not present in my power supply, could it be the overunity signature? ;D  I have attached a short video of it...any ideas on what it is are welcome!!!

I will continue to experiment and see if I can actually get the coil to work this time, but I still need to know which coil(s) I am supposed to resonate.

Oh, the frequency was 7KHz and the pulse with was 500ns.  This was non-open-ended primary drive with the output shorted through the filter cap.  Standard 0.0-120.0-240.0 phase timing.

EDIT:  This may be a 'scope issue, so please don't take this as proof of anything!! ;)  I need to run a lot more tests...
EDIT2: This effect has now disappeared (I have no idea why!!!) and I still cannot get any decent output from the coil, so I am back where I started.  Any help would be welcome...

Eldarion
"The harder the conflict, the more glorious the triumph. What we obtain too cheaply, we esteem too lightly; it is dearness only that gives everything its value."
-- Thomas Paine
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