WOT: looking for a model/minature generator ..., anybody got any info? |
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WOT: looking for a model/minature generator ..., anybody got any info? |
SirAndy |
Jan 15 2008, 12:02 AM
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#1
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Resident German Group: Admin Posts: 41,676 Joined: 21-January 03 From: Oakland, Kalifornia Member No.: 179 Region Association: Northern California |
i'm looking for a high quality model/minature generator about 1" x 2" in size.
it needs to be able to put out ~5V (or better) ... anybody got any ideas on where to look ??? (IMG:style_emoticons/default/idea.gif) Andy |
SirAndy |
Jan 15 2008, 12:53 PM
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#2
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Resident German Group: Admin Posts: 41,676 Joined: 21-January 03 From: Oakland, Kalifornia Member No.: 179 Region Association: Northern California |
well? (IMG:style_emoticons/default/confused24.gif)
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Jeffs9146 |
Jan 15 2008, 01:19 PM
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#3
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Ski Bum Group: Members Posts: 4,062 Joined: 10-January 03 From: Discovery Bay, Ca Member No.: 128 |
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SirAndy |
Jan 15 2008, 01:37 PM
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#4
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Resident German Group: Admin Posts: 41,676 Joined: 21-January 03 From: Oakland, Kalifornia Member No.: 179 Region Association: Northern California |
hmmm, maybe ... (IMG:style_emoticons/default/idea.gif) i guess i should have used the correct amurican term. i just realzied that you guys call them "Alternators" ... (IMG:style_emoticons/default/biggrin.gif) Andy |
SirAndy |
Jan 15 2008, 01:45 PM
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#5
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Resident German Group: Admin Posts: 41,676 Joined: 21-January 03 From: Oakland, Kalifornia Member No.: 179 Region Association: Northern California |
i looked through the PDF and that thing is waaaay too much overkill for what i need. my target is somewhere around ~5V and maybe 2-3 Amps ... this thing puts out way too much and i would need a humongous voltage regulator board to go with it to get to my target range. way too much heat generated by the VR as well. i need something smaller and/or with less output ... (IMG:style_emoticons/default/idea.gif) Andy |
Jeffs9146 |
Jan 15 2008, 02:01 PM
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#6
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Ski Bum Group: Members Posts: 4,062 Joined: 10-January 03 From: Discovery Bay, Ca Member No.: 128 |
QUOTE my target is somewhere around ~5V and maybe 2-3 Amps ... How about something like this? Genesys Amps don't affect components like volts and watts. You only use the amps that you need and it gives you the capability to expand your loads in the future. Volts can be regulated with a resister. |
SirAndy |
Jan 15 2008, 02:05 PM
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#7
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Resident German Group: Admin Posts: 41,676 Joined: 21-January 03 From: Oakland, Kalifornia Member No.: 179 Region Association: Northern California |
Amps don't affect components like volts and watts. You only use the amps that you need and it gives you the capability to expand your loads in the future. Volts can be regulated with a resister. i know, but if the initial low-rpm output is too large, regulating it down will create a lot of heat, which is not desirable for my application ... something with lower initial output would work much better for me ... (IMG:style_emoticons/default/smile.gif) Andy |
SirAndy |
Jan 15 2008, 02:08 PM
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#8
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Resident German Group: Admin Posts: 41,676 Joined: 21-January 03 From: Oakland, Kalifornia Member No.: 179 Region Association: Northern California |
much better! (IMG:style_emoticons/default/smilie_pokal.gif) hmmm ... reading the PDF right now ... (IMG:style_emoticons/default/type.gif) Andy |
davep |
Jan 15 2008, 03:14 PM
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#9
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914 Historian Group: Benefactors Posts: 5,152 Joined: 13-October 03 From: Burford, ON, N0E 1A0 Member No.: 1,244 Region Association: Canada |
What is the intended use?
Is it used in a car? |
SirAndy |
Jan 15 2008, 03:19 PM
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#10
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Resident German Group: Admin Posts: 41,676 Joined: 21-January 03 From: Oakland, Kalifornia Member No.: 179 Region Association: Northern California |
What is the intended use? Is it used in a car? nope, not car related. i need something for a small model that needs a constant power supply without the dead weight of batteries ... (IMG:style_emoticons/default/bye1.gif) Andy |
904svo |
Jan 15 2008, 03:54 PM
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#11
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904SVO Group: Members Posts: 1,118 Joined: 17-November 05 From: Woodstock,Georgia Member No.: 5,146 |
Try a RC electric model motor the 05 comes to mind, although its a motor
it also can be used for a generator. |
davep |
Jan 15 2008, 08:23 PM
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#12
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914 Historian Group: Benefactors Posts: 5,152 Joined: 13-October 03 From: Burford, ON, N0E 1A0 Member No.: 1,244 Region Association: Canada |
Andy, you are still cryptic.
What is the power source that you will be using? You must be getting the energy from somewhere. Like a motor of some sort? Or a high temperature heat source? Or solar panel. Does it have to be light weight, portable? Then you want to convert it to 5 volts DC? at 2 to 3 amps, so about 15 watts? |
Dr. Roger |
Jan 15 2008, 08:29 PM
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#13
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A bat out of hell. Group: Members Posts: 3,944 Joined: 31-January 05 From: Hercules, California Member No.: 3,533 Region Association: Northern California |
Andy, you are still cryptic. What is the power source that you will be using? You must be getting the energy from somewhere. Like a motor of some sort? Or a high temperature heat source? Or solar panel. Does it have to be light weight, portable? Then you want to convert it to 5 volts DC? at 2 to 3 amps, so about 15 watts? I believe that any DC motor, when driven, will create voltage. How much, I know not. |
SirAndy |
Jan 16 2008, 02:40 AM
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#14
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Resident German Group: Admin Posts: 41,676 Joined: 21-January 03 From: Oakland, Kalifornia Member No.: 179 Region Association: Northern California |
Andy, you are still cryptic. What is the power source that you will be using? You must be getting the energy from somewhere. Like a motor of some sort? Or a high temperature heat source? Or solar panel. Does it have to be light weight, portable? Then you want to convert it to 5 volts DC? at 2 to 3 amps, so about 15 watts? i'm cryptic because i can't talk about details of the project (unless i want to pay a hefty fine or spent time in jail) ... yes, it will be driven by a motor of sorts. yes, i needs to be small. yes, it needs to be lightweight. yes, heat is bad. output needed is ~5V and 2-3 amps. anything above that will result in additional heat when regulated down, which is not desirable ... why does it matter what drives the alternator ??? (IMG:style_emoticons/default/confused24.gif) give me something small that is known to work well, please! i'll buy you a beer or two if this pans out ... (IMG:style_emoticons/default/beerchug.gif) Andy |
Dr. Roger |
Jan 16 2008, 03:28 AM
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#15
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A bat out of hell. Group: Members Posts: 3,944 Joined: 31-January 05 From: Hercules, California Member No.: 3,533 Region Association: Northern California |
i'm looking for a high quality model/minature generator about 1" x 2" in size. it needs to be able to put out ~5V (or better) ... anybody got any ideas on where to look ??? (IMG:style_emoticons/default/idea.gif) Andy OK I'll bite.... at how many RPM's? and how much torque is available? My best friend is a robotics freak/electronics guru.... maybe he knows. |
McMark |
Jan 16 2008, 03:40 AM
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#16
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914 Freak! Group: Retired Admin Posts: 20,179 Joined: 13-March 03 From: Grand Rapids, MI Member No.: 419 Region Association: None |
Well, if you're not interested in the drive source, then use an electric motor. Spin the motor shaft, viola, power on the wires.
http://www.instructables.com/id/Lego-Generator/?comments=all Go to RadioShack or any other electronics store (Frys?) and pick up a small motor. |
Dr. Roger |
Jan 16 2008, 04:09 AM
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#17
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A bat out of hell. Group: Members Posts: 3,944 Joined: 31-January 05 From: Hercules, California Member No.: 3,533 Region Association: Northern California |
Well, if you're not interested in the drive source, then use an electric motor. Spin the motor shaft, viola, power on the wires. http://www.instructables.com/id/Lego-Generator/?comments=all Go to RadioShack or any other electronics store (Frys?) and pick up a small motor. Exactly..... or just bring a volt meter and start test spinning different DC motors with the volt meter attached. Prolly bring a friend to make things easier... LOL |
So.Cal.914 |
Jan 16 2008, 11:18 AM
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#18
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"...And it has a front trunk too." Group: Members Posts: 6,588 Joined: 15-February 04 From: Low Desert, CA./ Hills of N.J. Member No.: 1,658 Region Association: None |
Hi Andy, try these people http://www.sullivanproducts.com/ They make a set up
to charge batteries in flight. (IMG:style_emoticons/default/smile.gif) "i just realzied that you guys call them "Alternators" ..." Only if they put out 'AC', Gen's 'DC' |
Spoke |
Jan 16 2008, 12:47 PM
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#19
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Jerry Group: Members Posts: 6,991 Joined: 29-October 04 From: Allentown, PA Member No.: 3,031 Region Association: None |
output needed is ~5V and 2-3 amps. anything above that will result in additional heat when regulated down, which is not desirable ... If you do end up with a higher generated voltage than what you need, a step-down or buck switching regulator is the ticket. Efficiencies approaching 95% are possible to minimize power loss and heat buildup. Depending on whether you need a regulated voltage, it is common to generate a voltage higher than needed, then step it down with a high efficiency switcher. If you have your cell phone or iPod with you then you have probably 4 to 8 switching regulators with you. Every cell phone, PDA, Blackberry, iPod, MP3 player, camera has switching regulators to maximize battery life. Li-Ion batteries generate 4.2V and this must be stepped down to 3.3V, 2.5V, 2.0V, 1.2V, or even 0.8V for low voltage low power logic. Maxim, Linear Tech, TI, Monolithic Power to name a few offer step down switchers in the 1-2 amp range in very small packages. The power burning regulators you mention are linear regulators and do burn considerable power. Their efficiency is approximately Vout/Vin. For the example above, Vout = 2V, Vin = 4.2V, therefore efficiency for this would be less than 50%. Not good if you want to conserve battery life and minimize heat buildup. |
davep |
Jan 16 2008, 03:56 PM
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#20
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914 Historian Group: Benefactors Posts: 5,152 Joined: 13-October 03 From: Burford, ON, N0E 1A0 Member No.: 1,244 Region Association: Canada |
There are many ways to generate electricity, and an alternator is just one. Thermoelectric is one that I am working on. The S660 as mentioned might be a good method, but at $100 for 4 watts capacity it is not exactly cheap. If you need 16 watts, that is $400 (maybe less) plus lots of fabrication. They don't say what the maximum capacity of the controller is. |
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