Making an esc better? - Page 10 - RC-Monster Forums

zeropointbug · 10.21.2007, 05:06 PM

Related to your ESC-
a. Why you need heatsink at all? - So I can use it for almost any application, and stress it all I want, without it complaining.
b. How much power you need to dissipate? -Easily 2000watts peak handling
c. What temperature range of the ESC and FET's you would like to have?- Does this mean ambient temp? Or the operating temp? I would like to keep the FET's under 30F above ambient.
"How much power you think you dumping on ESC?"-Is this power output? Or heat output?

Related to future ESC-
a. What temperature range of the ESC and FET's you would like to have? (copy of "c")-Again, less than 30F above ambient
b. How long you would like your ESC to work continuous at 25%/50%/75%/100% load?- 25% Continuous, 50% Continuous, 75% 5 mins, 100% 1 min
"What kind of Amp ratings you would like to have from ESC and why?"- Psshh, 200 amps? I don't really want to draw any more than 100 amps, but the FET's will not be stressed, thus no need for heavy cooling.

BrianG · 10.21.2007, 05:13 PM

Quote:

Originally Posted by zeropointbug

b. How much power you need to dissipate? -Easily 2000watts peak handling

You must mean power output? If an approx 90% efficient ESC needed to dissipate 2,000w, the output to the motor would be 20,000w!

zeropointbug · 10.21.2007, 06:54 PM

HEHE, what can I say, the questions aren't that understandable!

GriffinRU · 10.28.2007, 02:17 PM

MambaMax FET's driver has troubles driving my new FET board, so I will make new board with built-in drivers...
I will check my math again as well.

Brains side and FET's side

suicideneil · 10.28.2007, 02:23 PM

Wow, that looks better than some 'proper' escs do. Do my eyes deceive me, or are there only 6 giant fets on that?...

lutach · 10.28.2007, 02:25 PM

It looks very nice. Those FETs are really tough. I hope it works out. What are the specs on the FETs? What will the specs be after you are done?

GriffinRU · 03:33 PM

Quote:

Originally Posted by lutach

It looks very nice. Those FETs are really tough. I hope it works out. What are the specs on the FETs? What will the specs be after you are done?

I like D2Pak-7 for package current ratings and there are versions for 40V and 75V.

GriffinRU · 10.28.2007, 03:35 PM

Quote:

Originally Posted by zeropointbug

Related to your ESC-
a. Why you need heatsink at all? - So I can use it for almost any application, and stress it all I want, without it complaining.
b. How much power you need to dissipate? -Easily 2000watts peak handling
c. What temperature range of the ESC and FET's you would like to have?- Does this mean ambient temp? Or the operating temp? I would like to keep the FET's under 30F above ambient.
"How much power you think you dumping on ESC?"-Is this power output? Or heat output?

Related to future ESC-
a. What temperature range of the ESC and FET's you would like to have? (copy of "c")-Again, less than 30F above ambient
b. How long you would like your ESC to work continuous at 25%/50%/75%/100% load?- 25% Continuous, 50% Continuous, 75% 5 mins, 100% 1 min
"What kind of Amp ratings you would like to have from ESC and why?"- Psshh, 200 amps? I don't really want to draw any more than 100 amps, but the FET's will not be stressed, thus no need for heavy cooling.

I will try to answer in this thread (I missed that tread completely, will try to catch-up)

GriffinRU · 11.02.2007, 10:00 PM

New FET's, new layout...

suicideneil · 11.02.2007, 10:07 PM

Nice work, you can tell its designed for high currents- the copper traces are massive compared to the gaps between them; its usally the other way around whenever I get bored and di-sect some broken electronic device before I throw it in the bin.... Here's hoping this one works better than the last one, Im sure it will though.

GriffinRU · 11.04.2007, 03:24 PM

While waiting on parts from Digikey, decided to play with Schulze.
Prototype works alright, no problems so far.
I'll try to dress it up and check on the truck.

Serum · 11.04.2007, 04:06 PM

Cool work Artur!

why not use a mamba 25 as a controller-board?

GriffinRU · 11.04.2007, 04:22 PM

Quote:

Originally Posted by Serum

Cool work Artur!

why not use a mamba 25 as a controller-board?

Thank You, Rene!

$80.00 for 25A looks expensive for me when you can get 100A for $135.00 and I can re-use parts from MambaMax, not sure about mamba 25.

But I don't see any problems with using Mamba 25 brains with my power boards. Once I make it to work with MambaMax it would work with all Castle family, I hope :)

Serum · 11.04.2007, 04:27 PM

great!, good to hear.

What's the current limit on these proto-types?

lutach · 04:42 PM

Artur,

On the Schulze controller, I see the small SMT resistors next to were the MOSFET goes. If I wanted to make extra powerboars, would thee work with the same resistance or would I have to use different resistance for everything to work ok? The reason I'm asking is because I see a few controllers that stack powerboards to up the AMP rating.