From: "Ralph Wade Phillips"
Subject: Re: Best way to power array of LEDs?
Date: Tue, 5 Nov 2002 06:57:30 -0600
Organization: Phillips Enterprises
References: <0001HW.B9C26E7400A7161B165FEAC0@news.covad.net> <7tGLdeAS6fn9EwBv@jmwa.demon.co.uk> <3ZKcndAgKa3r71qgXTWc3Q@comcast.com>
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"Tom Del Rosso" wrote in message
> "Dave VanHorn" wrote in
> message news:3ZKcndAgKa3r71qgXTWc3Q@comcast.com...
> > The alternator is only part of the system.
> > The voltage regulator does the controlling.
> > It limits the output of the alternator, both in current, and voltage,
> to a
> > safe maximum.
> > When you apply a load, the system voltage begins to droop, and the
> > regulator applies more current to the alternator's field coil (which
> is the
> > rotating one) This causes more current out the stator coils and
> diodes, and
> > brings up the system voltage.
> I had no idea a car's regulator used a feedback path through the
It doesn't. But it DOES monitor the system voltage, and at lower
voltages increases the field current.
Which isn't the same thing as a feedback loop THROUGH the alternator
> > > In other words does a generator precisely convert a higher
> > > load current into more mechanical resistance?
> > Both generators and alternators do this, by different means.
> > Before computer driven engines, you used to notice the loading effect
> > Now, the computer maintains idle at a preset speed pretty well, unless
> > something's very wrong with the system.
> Thanks Dave.