Calling all electronic guru's...

[brushless4life]

Morning gentleman and ladies. Have to stay P.C.

I have noticed that the CC hydra esc's, the 120 and 240, just look (in pics) like they stacked 2 & 4 (respectively) 60A esc's and wired them in a closed circuit. Guessing it would be a parallel setup. Does anybody know if this is actually how they work or if it just appears that way and its actually one circuit board with multiple levels and capcitors?

I ask because if it is possible to wire esc's in this fashion, why cant i do the same with a couple of 100A esc i have?

But I'm not really trying to double up on the amps it could handle, actually trying to get the volts up. I know its not the same as what the Hydras appear to do but its been plauging me if it can be done in either fashion and figured it would be the right example to use.

Basically, i have two 100A esc's that can hold 6s and i want to run 10s to a single brushless motor. If anyone out there knows a way please show me the light.

Thanks in advance

[domwilson]

From what I understand about the castles, the extra board is another set of FET's to double the max current capacity. You really can't parallel 2 ESC's to the same motor. Doing so would either burn out the motor, one or both ESC's. .

[Gary]

Dominic is right ..plus they will not be perfectly in sinc from what i understand and thats a problem in itself.

[MarkF]

No, you can not double up speed controllers to get more amps or more volts. It doesn't work that way.

Mark

[brushless4life]

i thought it might be wishful thinking,
thx for the replies

[BakedMopar]

Did anyone actually try it?

[domwilson]

Don't really need to. Overlapping pulses from two ESC's will introduce too high and too long of a duration DC component to the motor windings. Without enough energy being exerted in the form of mechanical energy, it will cause the windings to prematurely heat up and waaalaa. Magical smoke. A short may occur. Burning up the ESC's. That's not even taking into account how the ESC's work and sense back EMF. There's more to this. Google the schematics on brushless ESC's and you can get a basic design on them.

[brushless4life]

damn.. well i'll be dammned.

I thought maybe if it was possible, it would require some resistors inline somewhere to prevent one esc form sending current to the other. I didnt think it was so complicated, thanks for the info.

Question Dom, if it were not a brushless setup and rather a two wire brushed would it be possible or do the same principles apply? Strictly out of curiosity

[domwilson]

Not too sure with brushed DC motors. From what I've read on ESC's for them, they vary the speed of the motor by varying DC pulse widths. Might work but with a loss of speed control as again the pulse stream may not be correct. So you may have a motor that runs at full on and off.

[ReddyWatts]

Fyi

A Brushless motor ESC uses alternating positive and negative pulses timed into the three wires going to the motor. The timed pulses are all sent alternating from the positive side of the battery and the negative side of the battery at full battery potential. Pulse width and timing of the pulses control the motor speed. Check out the feedback comparitor circuits for sensing the rotor position which replaced the old generation motor rotor sensors for the pulse timing.

If two esc's are wired in parallel and running out of sync, it would be like placing a short circuit on the esc's output wires before the voltage reaches the motor and fry the controllers very quickly.

Check out the ESC schematic. The motor connects on the right side. One FET is connected for a positive pulse and the other connected for negative.

[brushless4life]

well that clears it up

kidding.. i understand now, i "was" under the impression that the esc worked more like a potentiometer regulating voltage to increase speed. now i know better.

Thanks again for the informative replies