Bicycle dinamo V1 by valand70

Last crawled date: 2 years, 11 months ago

This a simple DIY generator for bicycles.
It mounts on the rear wheel like in the pictures, and the tube across the forks have to be round (or better you should design one that fits your bike as there are many different types around).
The generator is made of two three phase small motors (you can find eBay links below), and a 3d printed support that has a recess where you can place rectifier diodes.
The regulator should be placed outside in a separate box, and this depends on the voltage and current regulator you choose, so you should design one that is good for you, or use a commercial regulator.
Adjusting the diameter of the roller will give you the possibility to decide at which speed you like to have the motors to turn, and so the current they will provide.
The axle of the motor is 3mm, and there is a small bearing on each side of the roller, mounted in an adaptor that have to be printed separately.
You can place rubber on the roller to improve grip on the tyre, possibly made from an old inner tube...
With the current roller diameter, you can reach 1A output at about 20Km/h or less, but be aware that more current produced means more power you have to put into pedalling, so it is better to limit the current drawn from the regulator.
At the moment there is no designed device to engage or disengage the device during cycling but there are a few holes on the sides to fit springs that will hold the generator pushed on the wheel during pedalling.
This is a test device that will evolve with experimentation.
This is a link to eBay pages with bearings and motors
3 phase motor
Bearings
Voltage regulator
USB regulator
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