Tragic accident with ball magnet EMDR motor-generator

[twinbeard]

Milehigh.  I just read your rant.  Please, show me some things that will make my jaw drop.  Bring you own instrumentation, if you feel it necessary.  Until then, quit swinging your dick around.  It is not attractive.

[MileHigh]

Twinbeard:

I recently estimated I have about 4500 hours of bench experience but I have hung up my scope probes.  How about you do a clip where you make proper measurements and demonstrate total competency with respect to your instruments and your pulse motor circuit?   Demonstrate a complete understanding of all of the nuances including covering all the issues related to driving the transistor properly.  Explain all of the dynamics of the coil including the spike generation.

Suck on that.

MileHigh

[twinbeard]

As I expected.  Just another troll, which is why I left this forum.  Nothing to contribute but asshattery.  My time is $250/hr, but I do not think I will be selling it to you.  Feel free to replicate what I built, if you can.  I included a full schematic and BOM, which is WAY more than I see from most of the pudwhacking naysayers making this forum have a poor s/n ratio.  The NASA folks, on the other hand,  tend to crowd around when I show up at their events and explain how my months in advance solar flare prediction system works.  I think my time is better spent speaking with enlightened individuals, as opposed to cowtowing to the desires of the foolish.  Now, if you will excuse me, I have people seriously interested in progress to attend to.

[twinbeard]

Also, per this thread, I too had one of those magnets explode, but only a 1/8" diameter model.  Luckily I was not hit.  It was a result of lack of heat dissipation in the rotor housing, which caused the magnet to reach a temperature over its Curie temp.  BOOM.  Be careful with these circuits.  There is a TREMENDOUS amount of angular momentum involved when tuned properly, and this can be quite dangerous.
That said, apart from other interesting effects produced by the rotation, solid state is far better for collecting energy, as you are not using any of it to drive your rotor.

[MileHigh]

Twinbeard:

I looked at your clip again.  You measure 20 microseconds between the small spikes.  You don't make a single attempt to double-check that measurement.  You don't try changing the time base, you don't try changing the trigger level, you don't make any attempt to double check your scope probe connection, you don't try to check if there might be a 20 microsecond clock signal somewhere else in the circuit or perhaps even close to the circuit.  You notice (not you personally, I mean the generic "you") that sometimes on the display you see that spikes are completely missing in a regular pattern, like "missing teeth."  But if your rotating magnet ball is truly doing one revolution every 20 microseconds that should not be happening.  But you don't even question that.  If there are missing spikes then something certainly is amiss, but you don't do anything to investigate that mystery.

Then you state that you tweaked the trigger level and you end up with a stable display but there are still two missing spikes!  You almost certainly are not looking at the speed of he rotating ball magnet.  3,000,000 RPM is a ridiculous speed for just about any size of rotating magnet but you are seemingly numb and unaware as you correctly crunch the garbage-in-garbage-out numbers.

Then you look at the generator output and you see a waveform that looks like icicles in winter.  You don't even make an attempt to reduce your voltage scale, change your time base, adjust your trigger level and get a good waveform triggered from that channel.  You are supposed to know ahead of time that the expected waveform is a near-pure sine wave at that alleged frequency.  It looks like a compound waveform of some sort, perhaps two separate sine waves added together, with "low" and "high" peaks along with some amplitude modulation as the two sine waves beat with each other.  Why is that?  You don't even try to figure it out.

Okay so you have a bunch of transformers in the circuit.  Perhaps that partially explains the seeming total mess on the output waveform, but you don't care.  You put your hand near the multimeter and the current measurement skews.  That's not supposed to happen so it almost certainly means that measurement is junk but you don't care.  Are there any bandwidth issues with your multimeter when is trying to measure the very high-frequency AC current?  I bet that you don't know and you never checked.

To sum it up, your clip is a total disaster.  My best guess is that your setup was self-resonating at 50 KHz while a the same time the little ball magnet was turning at high speed, but at a much much lower speed than the ridiculous speed of 3,000,000 RPM.

If the ball was actually turning at 3,000,000 RPM, chances are that within 10 seconds you would smell burning plastic and the thing would spontaneously self-destruct from the heat due to friction.

So your clip leaves a lot to be desired.  I am giving you the real deal.  I made $8 an hour when I worked at McDonalds in the 1970s.

MileHigh