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mdnanwelch7(at)hotmail.co
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 Posted: Wed May 12, 2010 9:04 am Post subject: Ivo motor current limiter design |
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Bob, group,
I just ordered the components for the solid state Ivo current limiter that Bob drew up for us.
Hopefully, I'll get it built in a couple of weeks, and begin testing. I'm sure every motor/prop is a little bit different, so I got a few extra .1 and .2 ohm resistors for fine tuning.
I hope I'm not too off base and abusing Bob's design goals, but I also bought a 3 position rotary switch, with the intent of locating it in conjunction of the .1 & .2 ohm resistors. My intension is to adjust the resistance readings of the three-position switch to show a 2-3 amp limit, a 5-6 amp limit, and an 8-9 amp limit indication.
I hope this isn't total heresy. Any criticism, BTW, will be duly noted and appreciated!!!
A special "thanks" to Bob for designing this circuit.
Mike Welch
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nuckolls.bob(at)aeroelect
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| Posted: Wed May 12, 2010 9:18 am Post subject: Ivo motor current limiter design |
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At 11:04 AM 5/12/2010, you wrote:
Bob, group,
I just ordered the components for the solid state Ivo current
limiter that Bob drew up for us.
Hopefully, I'll get it built in a couple of weeks, and begin
testing. I'm sure every motor/prop is a little bit different, so I
got a few extra .1 and .2 ohm resistors for fine tuning.
I hope I'm not too off base and abusing Bob's design goals, but I
also bought a 3 position rotary switch, with the intent of locating
it in conjunction of the .1 & .2 ohm resistors. My intension is to
adjust the resistance readings of the three-position switch to show a
2-3 amp limit, a 5-6 amp limit, and an 8-9 amp limit indication.
I hope this isn't total heresy. Any criticism, BTW, will be duly
noted and appreciated!!!
The 'problem' with using wire and moving parts
to switch low value resistors (under 1 ohm) is that
the compoents and materials used will add 'significant'
resistance to the devices being switched. Another
thing to consider is the current rating of the
switch. A significant portion of the total motor
current flows in the switch.
Note that the term 'significant' is not quantified
and what you propose is probably useful for the
experiment. But pending observations during the
experiment you'll no doubt want to fine tune
the final resistance values and eliminate the
switch.
My personal favorite "switch" for low resistance
experiments is the soldering iron. I'd tack-solder
the parallel tuning resistors onto the leads of
the permanently installed resistor.
Thanks for helping out.
Bob . . .
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