capacitors esc

is recommended to add external capacitors?

[whitrzac]

Originally Posted by galaxy76

is recommended to add external capacitors?

there not needed, but it can't hurt...

[Metallover]

The capacitors smooth out the voltage going into the esc. Say you gun it, and your battery voltage drops to 3.3v/cell under accelleration. The capacitors will dump all their energy during accelleration so the esc will get, say, what it thinks is 3.5v/cell.

many of them add to those already present inside the regulator.
Why?

[TekinTeamMgr]

On the Rx8 there is no reason to add more caps. Unless you plan on using it for drag racing applications.

[zeropointbug]

It will not hold higher voltage (well, for milliseconds maybe), what it does is lower the resistance for the PWM switching in the FET's. So, in theory, it might increase the voltage a very tiny bit, but nothing you will notice in real world. It will reduce heat (in theory) in the FET's because of reduced rise and fall times for each PWM pulse. Adding caps will also subsequently reduce the heat build up in each capacitor because of the load being reduced to each single cap.

Here is what I did to my Quark 125, took the 2 caps out (which had the tabs melted off) and added a 6 cap bank on buss bar soldered directly to the board, and used thermal adhesive on the FET's to secure them to the esc case, then to a heatsink. All in all, after making adding the caps, the controller 'felt', and the motor brakes sounded different as well. I can do 30 min mains, and temps afterwards are very low (cool) on a hot race day, in fact, it could be run 24/7 with the mods made to it. Pic shows it with the heatsink not installed yet.

http://picasaweb.google.com/SethHuls...48443563893362