How Can I Generate Electricity Using Movement, For A Device Which Is No Bigger Than 3cm X 3cm X 10cm?

I have to create a power source using movement to charge a phone battery. The device has to be able to fit into a tube and can be up to 10cm long but have a diameter of 3cm. I’m thinking ball magnets and coils, can anyone help?

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This entry was posted on Sunday, January 24th, 2010 at 3:01 am and is filed under Device. You can follow any responses to this entry through the RSS 2.0 feed. Responses are currently closed, but you can trackback from your own site.

2 Responses to “How Can I Generate Electricity Using Movement, For A Device Which Is No Bigger Than 3cm X 3cm X 10cm?”

  1. You might try using a small DC motor with a gear train and a folding crank to make a small dynamo. When you turn the input shaft of a permanent magnet DC motor, it generates a voltage. The gear train will speed up the RPM of the motor when you turn the crank to produce a voltage great enough to charge the phone battery. Most phone batteries require 5VDC to charge. Good luck.

  2. Try using a magnet in the shape of a cylindar (instead of a ball). Place the magnet inside another tube, and put wire windings on the outside of the tube. Shaking the entire device parallel to the direction of the bar magnet will cause the magnet to move within the inner tube, which will cause an electric current to flow from the wire windings. Sending that through a full-wave bridge rectifier and a capacitor, you can, in theory, charge a battery. Your arm might get a little sore though.