Pics of the Hacker Sport ESC

[lutach]

Originally Posted by GriffinRU

Same thing as with MambaMax.

I re-worked old, thermalled BK-Electronics ESC with copper plates in-between pcb's and now it works much cooler, plus caps and zener (I am thinking about an option to change zener on-the-fly based on battery voltage).

I can tune your ESC, but that would be after May,24.

Cool. What about a FET change? I've seen a few controllers out there that have some king of extra copper wire instead of just the PCB traces. Can that improve how the ESC eliver it's power?

[GriffinRU]

Originally Posted by lutach

Cool. What about a FET change? I've seen a few controllers out there that have some king of extra copper wire instead of just the PCB traces. Can that improve how the ESC eliver it's power?

I do not think we can gain allot by replacing fets.

Always, but new layouts have power leads right at fet's. Although there is always room for improvement...

[BrianG]

FETs are "voltage driven" (very high input impedance) as opposed to current-driven transistors, so paralleling them is easy without "loading down" the driver circuit. FETs also have a negative temperature coefficient which means they conduct less the more they heat up, so they are kinda self-regulating in a way.

And parallelling more FETs splits the current load between each as well as reducing the overall Rdson for reduced voltage drop and heat for a given current.

But the more FETs you have, the longer the signal paths become, which may be a problem with noise and/or transient response since we're dealing with capacitive FET gates.

I'm sure Griffin can elaborate much more on this, but I saw he was offline so I thought I'd throw in my $0.02.

heres an action shot of one...


the cool thing is, they put it red smoke for a little while...

[lutach]

Originally Posted by Bomb-Proof

heres an action shot of one...


the cool thing is, they put it red smoke for a little while...

Wow.

[snellemin]

WOW! was that with the limiter disabled?

ya, it ran cooler that way. It was a dually, the other suffered the same fate. 2 ESCs, and 1 motor...in one weekend. Hacker made it right for me though, so no biggie.

[lutach]

I have my limiter off and my Master Car race gets hot quick. My HW controller doesn't get hot at all. Do you guys think it's because of the Trinity N80's slotted design? I might try my Hacker B50-6S or the Trinity N60 to see if it works better.

[snellemin]

Running a 6L 380c feigao heated up the esc really quick. 130f on the stock caps, 139F on the heatsink and 134F on the battery. Mind you that this is with the limiter enabled. Gearing was at 54/18. Dropped a basic lehner 5300 and it ran cooler on 54/14 and had about the same power as the feigao . On 54/18 the Lehner was just a sissy. Cried like a bia***. Power came from 3s1p A123. With the 54/14 gearing it peaked at 798W, 106.25A@7.39V.

[snellemin]

Small update on the Hacker ESC.

pushed 5s A123 through it for about 10 minutes running up and down the street. ESC temp was 127F and motor was 164F. Gearing was 60/14 in the rustler on a hacker 8L c40 motor. It peaked at around 1200 watts and the limiter was still enabled.