Proof of Concept of the generator. I built a wooden frame on which the front legs of the bike would rest and a post to mount the generator on. The most important part that's missing is a proper friction wheel. The modded RC car wheel is too fragile to be of any use. I ordered another wheel which may prove more successful in transferring the power to the generator.
Some calculations: pedaling at 70 RPM the flywheel rotates at 230 RPM. With a diameter of 30 cm and a wheel diameter of 6 cm this becomes 1.2k RPM on the drive shaft and 10k RPM at the motor. It seems perfectly happy to rotate at that speed. The bridge generates about 13 V across a 4 ohm load which is about 40 W.
The key hole is intended for a 4x4x20 DIN 6885A parallel key. I made a makeshift key using two pieces of epoxy PCB. This stuff is 1.6 mm thick and filts the slot nicely. I found no wheels for the 12 mm drive shaft of the reducer so I still have to build my own...
 mount1 |
 mount2 |
 mount3 |
 mount4 |
 mount5 |
 key1 |
 key2 |
 key3 |
 3-phase_bridge1 |
 3-phase_bridge2 |
 3-phase_bridge3 |