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Wall of case fans? Answered

Hey guys, I have been thinking up ideas all night for wind power. I've been messing around with a decent dc motor I found in a printer, but I'll have to wait till tommorow to make some kind of proper blades for it. I however, have an interesting idea. I was thinking of using just one case fan by itself to generate power (see video below). But then I got to thinking, what if I made a wall of case fans in my back yard? and wired them all up in parallel or something. I measured the output of one case fan I have here and at most I could get was 0.100v DC turning it by hand as fast as I could. I come along so many case fans and throw them out all the time, so why not re-use them?? I'm not sure winter time would be the best time to put something like that out, but I think it would work.


i have instructable in progress on the topic for now - 1 fan can light a led or few if the wind is medium or more and in strictly constant direction

I am posting a topic right now as we speak, I took some pictures of the stuff I have right now and I want to put something together. The case fan idea will have to wait until I make it to the dump to go finding some. The question is, do I have to look for DC brush case fans? Or can the brushless ones be converted to output power? The circuitry built into them apparently makes it not possible for power to be generated out of the existing leads. Any ideas bro?

i used one brushless and removed the circuit from inside it outputs 2 phase ac with enough power for few leds if wind spins the fan at all

Also, me thinks I will be making a trip to the local dump tommorow to pick up some VCR's, I've read of some interesting ways to make wind generators.

You should get something better than a case fan out of a VCR. But go for the oldest looking ones you can find as they tend to be easier to take apart. L

That makes sense. Also, that site I linked to points out two different styles of VCR motor, I assume the one with more copper coils (the good one) is probably found in older vcr's and the cheaper looking one (supposedly lots of drag at high rpm's) is probably gonna be found in cheapy, but new vcr's I also see in the dump a lot. Thanks for pointing that out, or else I would have just started grabbing a whole bunch of vcr's, that'd suck if I ended up with a whole bunch of vcr's that were completely no good. Also, I got another question lemonie. I have this 6V lead acid battery I've been storing/moving around for like 4-5 years now that my uncle left behind in my house, he owned a business for a while that sold industrial electronic parts, and also chandeliers for some reason, but nothing in between :S Anyways, I have this battery that I don't think has ever been charged or used, as the terminals were clean with no sign of being plugged in (scratching), when I had got it. But no charge in it either. How in hell do I charge one of these batteries? If I make a wind turbine out of a vcr motor, would that work? Seeing as they're supposed to put out a good 6-8v at low wind speeds (according to the website). I don't have anything I can call an electronics parts shop (as far as buying strips of capacitors, resistors, leds, let alone boxes of 5 or something like that). So the question is, where should I look for diodes to rectify the output of the vcr motor? Inside the vcr? But I hate working with clipped parts off circuit boards, so I get happy when I come across parts standing high off their PCB. What do you think Lem?

. The battery is probably bad after so many years without a charge. :( . Unless it's a dead short, hooking it up to your system shouldn't hurt (your generator probably doesn't put out enough current to overheat the battery or itself), but I wouldn't expect it to take much of a charge. . . Just because your generator will put out 8V with no load, that doesn't mean you'll get 8V when under a load. See how many volts you get with a, say, 10-100 Ohm resistor as a load.

Hmm, I found that the main VCR drive motor (see pic) didn't have an obvious way of coming apart, and has two multi-pin connectors on it so I wouldn't know what to do with it - modern construction I think? The load-eject motor was a simple two pole DC though. W/ref the battery, maybe it needs the electrolyte topping-up? To charge it, you need to apply more DC V than it outputs, if you've got an ammeter and a variable DC supply(?) connect the ammeter in series and turn up the power until you see current flowing. The 6-8 V sounds like it would do it. For diodes I reckon you'd get lucky in an old TV. (But if you're really stuck for diodes I'm sure I've got a few I could mail you). L

Apparently the main video head motor is supposed to just pull apart? As far as the multi pins, I guess you would just have to poke around with a multimeter while it was spinning (hold the wheel against another motor or something? As far as the battery, it's a sealed lead battery, so I doubt very much I'll be able to top it up. I wish I had an ammeter but I don't. I do have a really fancy multimeter however, will that do?