From: John Larkin
Subject: Re: Electricity generator for an electric scooter?
Date: Sat, 09 Nov 2002 19:12:26 -0800
Organization: Posted via Supernews, http://www.supernews.com
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On Sun, 10 Nov 2002 01:34:17 GMT, full name wrote:
>(Well, I posted to the electrical engineering group and got no reply,
>so I'll bug my favorite high tech group about it.)
>The idea faceplant suggested here
>is awesome IMO, to store stopping energy and then release it when
>accelerating. But, I imagine that sort of thing would already be a
>reality if it were doable, since it applies to so many activities
>(like bicycling, driving, etc). Maybe it is more nearly applicable to
>an electric scooter. An electric scooter already has a battery so it
>would just need to turn the braking energy into electricity (probably
>not much). I guess efficiency would be everything. Going down hill
>could generate significant electricity but you know that going down
>hill means eventually going up hill.
>So, how difficult to add the converter/generator?
>I realize you all probably usually deal with deeper design concerns,
>so please redirect if you feel like it. I guess the question is how
>small/light/efficient can an applicable electrical generator be?
>Just curious. If the idea is so stoopid that it hurts your ears, let
>me know that too since I have no intention of making such a device.
Hybrid cars do this already; they call it 'dynamic braking'. And the
simplest generator is the drive motor itself. But it requires some
electronic controls to manage the amount of braking and the
I think there are electric-assist bicycles that have dynamic braking
too. They must already have suitable electronics packages. Try
googling for 'dynamic braking' and such.