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Originally posted by CitizenDC
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Hello again,
Update:
I've discovered a simple method to make the Imhotep-Bedini fan self-oscillate.
By self oscillating, the fan output power is many times higher than before and far bigger spikes are shown via the Neon. The fan doesnt turn but instead makes a high pitch sound. Actually after coils start oscillating you can take the rotor off and it will continue working!
How to:
Firstly, grab a standard stock fan you've converted via Imhotep's design.
The coil-to-coil resistance should be around 40 or 60ohm.
Next you will need a 10k-15K resistor and one 1N419 diode (signal diode).
Replace the components as described here.
Once you have swapped out the components, start with a resistance of 10k omh.
Next, disconnect your output so that the Neon light takes the output strain.
Method 1:
Swing your fan up, it will spin and make a high pitch noise then begin to slow down and bounce back and forth all the time until it comes to a stand still and still making a high pitch sound.
Notice the glow on your Neon. Play with your resistance, increase it to find the resonating sweet spot.
Method 2:
Instead of swinging the fan, there is another method to get this to start which is best done once you have completed method 1 and fine tuned your circuit.
In short, grab the negative (-) output lead of your circuit and and give it a a light wack with another metal object. I have crock clips on my ssg outputs so that I can make better impact contact.
You will also notice just by touching certain parts of the circuit will also get it going into self resonance.
Connecting the output:
Once your coils are resonating and the Neon is brightly lit, the next step is to apply a load. What you will notice is that sometimes the coils will stop resonating when you touch both output leads onto a battery or multimeter.
To get around this you can connect the positive output to a probe or bat terminal then strike the negative to get the circuit resonating again, then make a firm contact in one movement onto the other probe or terminal.
kinda funny, but this is what works for me.
Performance:
You can increase the performance or resonance by adjusting the rotor/fan blades about 90 degrees from its resonating point by taping it down onto the fan case. This creates a 5-10% increase in voltage output.
You will notice the blades will resist you moving them and the coils will make a more noise.
Troubleshooting and Safety:
The resonance or oscillation relies mostly on the resistance. If your is not working, adjust your resistance higher so that when you spin your fan that it doesnt have enough power to keep going, then it will slowly begin to settle and start humming at a high pitch.
If found that the signal diode 1N914 to make this all work.
Also, I dont get resonance when I have a load attached to the fan and I try start it. So always disconnect a load before to get this to work.
Finally, take special care to monitor the coils temperature while you let it resonate, with the smaller stock 80mm fans I've run for about 24 hours now and the heat is no problem but I've not tested all fans.
Once you've done this mod, you can use it as a driver to Imhotep's Radiant Oscillator instead of the auto-relay.
cheers!
Update:
I've discovered a simple method to make the Imhotep-Bedini fan self-oscillate.
By self oscillating, the fan output power is many times higher than before and far bigger spikes are shown via the Neon. The fan doesnt turn but instead makes a high pitch sound. Actually after coils start oscillating you can take the rotor off and it will continue working!
How to:
Firstly, grab a standard stock fan you've converted via Imhotep's design.
The coil-to-coil resistance should be around 40 or 60ohm.
Next you will need a 10k-15K resistor and one 1N419 diode (signal diode).
Replace the components as described here.
Once you have swapped out the components, start with a resistance of 10k omh.
Next, disconnect your output so that the Neon light takes the output strain.
Method 1:
Swing your fan up, it will spin and make a high pitch noise then begin to slow down and bounce back and forth all the time until it comes to a stand still and still making a high pitch sound.
Notice the glow on your Neon. Play with your resistance, increase it to find the resonating sweet spot.
Method 2:
Instead of swinging the fan, there is another method to get this to start which is best done once you have completed method 1 and fine tuned your circuit.
In short, grab the negative (-) output lead of your circuit and and give it a a light wack with another metal object. I have crock clips on my ssg outputs so that I can make better impact contact.
You will also notice just by touching certain parts of the circuit will also get it going into self resonance.
Connecting the output:
Once your coils are resonating and the Neon is brightly lit, the next step is to apply a load. What you will notice is that sometimes the coils will stop resonating when you touch both output leads onto a battery or multimeter.
To get around this you can connect the positive output to a probe or bat terminal then strike the negative to get the circuit resonating again, then make a firm contact in one movement onto the other probe or terminal.
kinda funny, but this is what works for me.Performance:
You can increase the performance or resonance by adjusting the rotor/fan blades about 90 degrees from its resonating point by taping it down onto the fan case. This creates a 5-10% increase in voltage output.
You will notice the blades will resist you moving them and the coils will make a more noise.
Troubleshooting and Safety:
The resonance or oscillation relies mostly on the resistance. If your is not working, adjust your resistance higher so that when you spin your fan that it doesnt have enough power to keep going, then it will slowly begin to settle and start humming at a high pitch.
If found that the signal diode 1N914 to make this all work.
Also, I dont get resonance when I have a load attached to the fan and I try start it. So always disconnect a load before to get this to work.
Finally, take special care to monitor the coils temperature while you let it resonate, with the smaller stock 80mm fans I've run for about 24 hours now and the heat is no problem but I've not tested all fans.
Once you've done this mod, you can use it as a driver to Imhotep's Radiant Oscillator instead of the auto-relay.
cheers!
You have discovered the self oscillating effect that can happen if the resistance is too high on the base. You should be able to trigger it simply by hooking it up and switching it on. I have a self oscillating trifilar with a full cap pulser on the back end that works really well. There is actually a better way to configure this, just using resistance, no diode needed (except for output). Check the radiant oscillator thread for Jets post. And you dont have to have a specific resistance on your coils for it to work, usually anything with over 300 turns you can get to do this.
Have fun, if you want to build this thing from scratch then just wind a bifilar coil 450 turns and wire it up exactly as you have for the fan. Use an air core (i.e NO core) and your frequency will be alot faster.
for any information that you provide. The 3-phase scooter motors is actually one of the ones that I was looking at, however I am currently working on a smaller one right now. Roughly the size of the Reel-to-Reel motor that Aaron setup, except mine is 3-phase instead with 27 poles, 9 per phase. I will keep looking and trying and if I find anything, I will post it to share.
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