Re: negative resistor
- From: kensmith@xxxxxxxxxxxxxxx (Ken Smith)
- Date: Sun, 8 Oct 2006 01:23:24 +0000 (UTC)
In article <1160269875.712815.126300@xxxxxxxxxxxxxxxxxxxxxxxxxxxx>,
<bill.sloman@xxxxxxxx> wrote:
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.
The same sort of thing can be used to get a constant torque out of a
motor. As the motor speeds up, its voltage rises and the circuit
increases the current to make up for the motor's losses.
--
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kensmith@xxxxxxxxx forging knowledge
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