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Wind Turbine from a cordless drill? Answered

hi guys i have come across an old 18volt drill. i connected it to some small pvc blades about 12 inches long in the hope of generating some small amount of power. Pointed it into a reasonably stiff breeze but the blades wont turn due to the gears of the drill. Anyone out there got any ideas on how to make this work.  is there any way to free the gears so it turns easier or any advice on what size blades would be required to turn the motor.

Any suggestions would be appreciated.

sam301

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RavensCraft (author)2013-01-26

Like the others have said,the gearing of the drill does not make it a good candidate for a wind generator.
However it would make a decent hand crank generator.
You could bend a 1/4" rod into a hand crank and insert
it into the drill chuck.

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frollard (author)2013-01-26

The trick is the input has to match the old output.

An electric motor as generator will generate the same power backwards (essentially) so long as you turn it at the same speed with a load on the power terminals.
The old cordless drill was probably 100-500 watts at a few hundred rpm (at the chuck). The motor wants to turn several thousand rpm - anywhere from 1000-8000rpm. Your turbine is too weak to put out the torque and wattage to overcome the gears and the motor. You can as rickharris says take out the gears but then you'll be turning a bare motor at a few hundred rpm, and will be lucky to get a few volts out of it in hurricane force winds.

Gear rpm multiplication is only useful if you have a HEAP of input torque, and an 18" turbine won't cut it for a cordless drill.

Have a look at the related instructables >> over there >> to see how many people are making gearless low-rpm generators. Each gear in your drill loses energy/efficiency through friction. Eliminating them is one of your only options.

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sam301 (author)frollard2013-01-26

thanks for your information.
sam

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rickharris (author)2013-01-26

Just use the motor. That is remove the gear box it should come off easily. You will get up to 18 volts if the motor turns fast enough BUT output will depend on speed

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