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Model Forum / Radio Controlled / Water Models / April 2007



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Motor capacitors

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BCRandy - 12 Apr 2007 00:37 GMT
I am building an air boat for my nephew out of bits I've
picked up here and there and I've come up with a question.
I'm using a speed 600 brushed motor with a 3800 mAh, 6 cell
NIMH battery pack and a 35 amp ESC with a BEC.

My web research came up with some conflicting info about
using capacitors to reduce radio interference from the motor
(mine has none).  One source said "never put a capacitor
between each terminal and the motor's case - It will short
out the motor".  However, the Powerboat Forum.com info said
to put a .01 mfd capacitor from each terminal to the case
and a .047 mfd capacitor across the motor's terminals.

Based on park flyer motors I've looked at in my LHS, I'm
tempted to believe the latter advice, but I would appreciate
input from those more knowledgeable than I. TIA.
funfly3 - 12 Apr 2007 09:35 GMT
> I am building an air boat for my nephew out of bits I've
> picked up here and there and I've come up with a question.
[quoted text clipped - 12 lines]
> tempted to believe the latter advice, but I would appreciate
> input from those more knowledgeable than I. TIA.

a lot of model motors already have a capacitor fitted internally, have a
close look near the terminals and you might see a small wire joined to
the terminals, I have several electric gliders and none have any
external capacitors and the range is farther than I need
BCRandy - 12 Apr 2007 12:18 GMT
I just re-checked - no capacitors inside, as far as I can
see...

>> I am building an air boat for my nephew out of bits I've
>> picked up here and there and I've come up with a
[quoted text clipped - 20 lines]
> several electric gliders and none have any external
> capacitors and the range is farther than I need
funfly3 - 12 Apr 2007 14:28 GMT
> I just re-checked - no capacitors inside, as far as I can
> see...
[quoted text clipped - 23 lines]
>> several electric gliders and none have any external
>> capacitors and the range is farther than I need

as long as you use non polarity capacitors you cannot short out the
motor and adding extras should not make it any worse only better
Jim Slaughter - 13 Apr 2007 03:10 GMT
Go with the advice from the Powerboat Forum!!

>I am building an air boat for my nephew out of bits I've picked up here and
>there and I've come up with a question. I'm using a speed 600 brushed motor
[quoted text clipped - 10 lines]
> believe the latter advice, but I would appreciate input from those more
> knowledgeable than I. TIA.
 
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