Re: negative resistor
- From: bill.sloman@xxxxxxxx
- Date: 7 Oct 2006 18:11:15 -0700
STUARTe wrote:
if you look at the voltage current relationship at the input side of a
voltage regulator, you'll note that it acts like a negative resistor.
as the voltage source increases, the current decreases.
my question is, could you get a super conducting (zero resistance)
element by putting a resistor in series with the negative resistor?
Not in any useful way.
But one way of getting constant speed out of DC motor over a range of
loads is to feed it from a circuit which is designed to look like a
negative resistance that exactly compensates the widing resistance of
the motor coils.
IIRR Philips got a patent on this many years ago (which has long ago
expired). I built one back in 1993 and it worked a treat - admittedly,
at low revs, where stick-slip was a problem, only the average speed of
the motor came out right, but the circuit did the job that was asked of
it.
--
Bill Sloman, Nijmegen
.
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