nuckolls.bob(at)aeroelect
Guest
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 Posted: Sun May 09, 2010 6:10 am Post subject: IVO Prop Motor Current Limiter and Electronic CB |
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| Quote: | I was finally able to test that circuit today. It worked exactly as
predicted. With only the 0.1 ohm resistor, the current was limited to about
6 amps. This did not allow the motor to go as far as desired. So I added the
parallel 0.5 ohm resistors one at a time. With both in place, it allows a
bit over 8 amps, which is where the motor just starts to strain. This is
also about the same place where the reed switch triggers.
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Hmmmm . . . for the final configuration you'll probably want
to increase the current limit on up to 10A. Without knowing
the modulus of elasticity of the prop materials with respect
to temperature, you don't want to loose pitch-stroke because
the current limit it set too low. So paralleling the .1 ohm
with .2 ohms will produce a total of 1/(1/0.2 + 1/0.1)= 0.066
ohms which should boost the limit to just over 10A.
Adding the 200-500 millisecond trip over ride should allow
you to flirt at the edges of the 10 C/B value without
tripping it.
Bob . . .
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