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Thanks Ian.
I get it. Sounds like if I do not want to waste
valuable battery power on heat disipation I need to go with a pwm.
Thanks. Bill Akins.
----- Original Message -----
Sent: Wednesday, February 08, 2006 1:40
PM
Subject: Re: [PSUBS-MAILIST] variable
speed switch.
I was thinking something like this PWM:
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=7588923867
The
potentiometer is a far better idea than the
DC->AC/dimmer/AC->DC,
although it would still be inefficient.
The potentiometer will
reduce the power getting to motor by disipating the
difference
as heat, so at full thrust, the potentiometer doesn't do
anything,
but at half thrust the potentiometer will disipate the
other
half of the energy as heat. This is still better than AC
conversion, but the Pulse Width Modulation is far more
efficent.
Ian.
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