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Old 02-13-2012 | 08:30 PM
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2walla
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From: walla walla, WA
Default RE: Adding caps to esc???

Interesting watching the development of the thread and all of the opinions....Adding additional capacitors is not to change the inductance of the wiring haness but is to smooth induced EMF caused by the chopper circuit that pretty much all speed controls use.. If you look at the output of a brushless speed control on a scope you will see that the speed contol is converting the DC into a on/off square wave- with three phases- This switching on and off creates back a back emf (or voltage) between the battery and the sped control- causing high frequency voltage spikes that can damage the front end of the speed control... The additional capacitors are there to try to act as a buffer to absorb the spikes in input voltage caused by back emf. It is a real problem if you run long power leads.. Call hacker and talk to them about it... Extend the motor leads It won't cause a problem... I have checked several setups with up to 4 feet between the motor and esc witout a problem.. And for the geeks out there. On a setup turning 10100k rpm with stock power and motor leads, with the 4' extended motor leads it turned 9950 with the 4' extended motor leads. This was on the same battery with about 15 min between runs to solder up the extensions and rehook the wires..