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Q: human powered generator ( No Answer,   2 Comments )
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 Subject: human powered generator Category: Science > Physics Asked by: pherz-ga List Price: \$100.00 Posted: 24 Mar 2006 11:20 PST Expires: 25 Mar 2006 18:17 PST Question ID: 711536
 ```I want to build a bicycle (stationary) powered generator system for an art project. The generator (or alternator), linked to the rear wheel of a bike on a stand, will charge a 12 volt car battery (batteries). The battery will then be wired to 2 small DC electric motors that will turn the 2 moving parts (cylinders) of the art, which will weigh approximately 5 pounds each but will be balanced upright on pivoting vertical axles. I also need to power 2 light fixtures, each likely to be 12-18 inch florescent 12 volt tubes from an RV store. I need to know what type of generator/alternator to look for that can be easily linked to the bike wheel on a stand, and that can be reasonably powered by a person on the bike, and will provide enough power to run the system.. My project requires that the cylinders turn at a constant rpm of about 30, so I'm thinking I'll need a consistent voltage supply to the 2 small motors; that's why I don't think linking the generator directly to the 2 small motors will work, as the rpms of the motors, and thus the cylinders, would vary with the speed of the bike wheel. The 12 volt battery, consistently charged, should supply a relatively consistent voltage to the small motors. Please provide the following, keeping in mind that your calculations require this entire system to be powered by an average person on a bike: specific type of generator/alternator, where to find it type and size of the 2 small motors, where to find them can the 2 small motors be wired to a device that can control and vary the rpms do I need a voltage regulator? If so, what kind, where to find, and how to wire it. suggestions regarding linkages - belts, gearing, etc. Finally, I'd like to keep the system as simple as possible, and keep the costs "reasonable". Thanks - Pat Herz```
 ```It seems to me that having a battery would defeat the idea of having to pedal the bike to make the cylinders turn.```
 ```As far as the alternator is concerned, you can just purchase one off the shelf from an automotive supply store.```