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NNTP-Posting-Date: Thu, 16 Jan 2003 16:05:41 -0600
From: "Arthur Jernberg"
Subject: Re: Using DC Motor as Dynamo
Date: Thu, 16 Jan 2003 17:05:47 -0500
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Depends a lot on what you are going to spin the motor with. Using another
motor attaced via a clutch may produce the current neecessary to charge the
batteries but the total gain of energy will be negative, that is, due to
losses in the mechanical transmissionof energy you will loose some of it due
to heat, friction, etc. Using a windmill or water wheel with proper gearing
and coupling may be an option if free source is abundant.
"Andy" wrote in message
> James wrote:
> >I am thinking of using a DC motor which is moving forward and reverse
> >to charge up a rechargeable battery. Is this possible ?
> basically a dynamo is just a motor in reverse anyway, the basic problem
> is spinning it fast enough to generate a decent voltage - basically why
> it was superceeded by the alternator in cars .. ..andy
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