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Old 09-04-12, 02:24 PM
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James123456
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Originally Posted by dougmc
It doesn't work that way -- the additional load you put on the existing motor would be more than any energy created.

What you're trying to create is basically a perpetual motion machine -- and it just doesn't work.

The only time what you're talking about makes sense is when you're intending to slow down already, and many electric bikes already have a feature that recovers some of that energy -- it's called regenerative braking. It's also found in hybrid cars (and really, it's the #1 reason for making them hybrid in the first place.)

In any event, if you're after regenerative braking, you don't want to use fans or turbines -- you want to use a generator coupled to a wheel. And since electric bikes already have one -- the main motor -- they just use that. (Motors and generators are basically the same thing.)
So even if you used a large motor like http://coleco.freeservers.com/motors.htm#MOTOR750 , you wouldn't be able to offset the initial load? If you ran it off an already rotating source such as the belt or tire it still wouldn't help? There is no possible way to offset that initial load?
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