Fusionchip's Bedini Feedback to Source!!!

[nievesoliveras]

@plengo

When I get stuck building something, what I usually do is that I stop what I am doing and prepare myself a good cup of coffee without any hurry and while the coffee is on the microwave I refresh my eyes with cool water. When the coffee is done I sit on my living room hammock and enjoy it slowly, then suddenly an idea pops up inside my head. If I can do it inside my head while sipping coffee peacefully, then I can do it on the real world. Almost all the failures are visualized before they happen.
The same thing if you go for a walk or a bicycle ride.

Jesus

[plengo]

@ Fausto

Over the last couple of days I have been reducing my fan running current from 100mA down to the present 20mA in steps. I have not yet reached a perfect stabilised point but after each stepped reduction of current I see a slow increase in battery voltage back up to almost the same level as before the current reduction was made. This climb in voltage can last for as long as three hours before it starts to very slowly drop again. Its hard to see when the climb ends and the drop begins because I'm not setup to measure the voltage in 100ths of a volt which is really necessary for this experiment. I just need to check with you that this is not the effect you are seeing because this IMO is a normal battery recovery situation which would usually appear to be much quicker if the discharge current level was a lot higher. This voltage climb could be even longer in yours and Gadget's case because you are both using a 48V fan and will be running at a lower current level than me with a 24V modified fan.

Hoppy

No, it is not what I have. I passed that phase already. I am at the 7ma current level now. In my last eureka moments what I have is really a voltage not dropping at all and actually going up. I am using an SLA in series with a wet cell lead acid. This way I can see the voltage of the SLA in a few minutes (like about 2 minutes) going up or down. At 24v and with a small SLA I can get by not having a meter with hundreds of a volt a measurement accuracy. This way I can very fast see if the device is properly tuned or not. Just for you to understand, I let the battery rest until no voltage change is noticable for the next 10 minutes. It is really at rest. Tunned the fan (position the magnets) and put it to spin. If the voltage goes down on the small SLA (5 amp/hour battery) it is no good. Stop, let the voltage rest another 10 minutes and start over again. Do that about 100 times on a day. Sleep late and youtube while you do that.

What I have been experiencing is indeed, while running, a voltage increase. The problem is that I must find the correct positioning of the magnets on the fan and it is simply not easy neither documentable. Even if I get it right, how can I study it without breaking the sweet spot and start from zero again?

This is a very sensitive device. It would be good to be able to formulate some theories why this is even possible, if I am not craizy neither gadgetmall.

There is a spot where the fan just spin at around 130 to 150rpm max and the sound becomes this 2 bips (lots of radiant on each one) that is very similiar to a goose, but there is no discernable wave pattern difference. One spot will simply work and others will not. It is really dog work.

Just for completeness, I am using 3 sk3606 on the positive of the battery + a few more diodes (they help to get to the minimun current consumption to 7ma average). My resistance is two 10k resistors plus a 5k pot (positioned at the max) and a 470 ohm resistor. All totalling 25470 ohms to the dot. That is the setup I found to work and have not changed since them. The only parameter being changed here is the magnet positioning. The system is running at around 12.55v (SLA) + 12.01v (Wet cell, and I know 12.01 is pretty low but who cares), totalling 24.56v. My fan has 150 ohm resistance on two widding and 150 ohm on the other two widding.

if you bring the current really down like I did, you will notice that at 140rpm the sound will be very peculiar and sounding really like a goose. That's where the miracle is happening. It is not about having power or current it is really about something else that we can not see on the scope or meters. The magnets somehow are interacting with the pulsating of the coils and charging the batteries.


Fausto.

[Hoppy]

Thanks for your detailed procedure Fausto, much appreciated. I can hear the goose but I think I need to go lower in current to get the charging effect you are seeing.

Hoppy

[AbbaRue]

One problem with these computer fan bedini motors is the fan blade. 
If we could build one of these without the fan blades that blow air we would have a lot more power
going back to the battery.
Right now most of the energy is wasted blowing that air around.
@plengo
Maybe the problem is you are stopping the fan from blowing freely with something blocking it.

[Hoppy]

@ Fausto

A possible problem I can see using two batteries in series, is that I have found that when there is a difference in voltage between the batteries, one can rise in potential during discharge. I'm not saying that this is happening in your case but it is possible.

I have now reduced my fan speed as much as possible whilst remaining stable and I will monitor this over the next few hours. If I detect a drop in voltage I will then reposition my magnet. I'm using a flat hard disk magnet as per Gadget's suggestion. Once we can get our batteries charging it will be interesting to see how high the voltage will climb and whether it will stabilise at a certain level or eventually fall. Gadget reports that he can 'fry' his batteries so it will be exciting to see if we can get as advanced as him.

Hoppy