MambaMax ESC quirk

[BrianG]

Just my opinion here, but the MM is not intended for a MT or similarly weighted vehicle. Plus, it's only good for 4s/12 cells despite some people running more. A full size ESC has more voltage options. The real answer here is to wait for the Mamba Monster Max... if it ever comes out!

BTW: If you attach an external heatsink to the Quark, it doesn't need a fan. But, you are right about the thermal pads on the inside breaking loose sometimes. That didn't happen to me, but I modded it anyway before it happened. The good news here is if that does happen, you can send it back to Quark under warranty.

[lxmuff]

What are these thermo pads breaking loose? I have a problem with mine that could same problem.

Originally Posted by BrianG

Just my opinion here, but the MM is not intended for a MT or similarly weighted vehicle. Plus, it's only good for 4s/12 cells despite some people running more. A full size ESC has more voltage options. The real answer here is to wait for the Mamba Monster Max... if it ever comes out!

BTW: If you attach an external heatsink to the Quark, it doesn't need a fan. But, you are right about the thermal pads on the inside breaking loose sometimes. That didn't happen to me, but I modded it anyway before it happened. The good news here is if that does happen, you can send it back to Quark under warranty.

[BrianG]

Originally Posted by lxmuff

What are these thermo pads breaking loose? I have a problem with mine that could same problem.

Inside the Quark, there is a thick (~1mm) thermal pad that provides heat transfer from the FETs to the case. This pad is sticky on both sides to provide consistent contact. Actually, there are two pads. One between the FETs and a small Aluminum slab, and the other between the Aluminum slab and the case. THe slab is simple a spacer.

Some people have reported that these pads, over time, come loose. I imagine constant vibrations and the intake of dust particles slowly nulls the adhesive on the pad until it simply comes loose. When this happens, there is very poor heat transfer to the case and could overheat.

Some people open up the case and use thermal epoxy instead. However, once this is done, it is not coming apart again. So, this is a permanent solution and will void the warranty. Doing this mod makes the ESC run much cooler though.

[Procharged5.0]

Too bad they don't have a better solution to that during the MFG process.

[BrianG]

Yeah, but I can see why they do it that way - to allow the boards to be removable for repair. If they made the case a little bit wider, they could use a clamping mechanism instead to allow the use of regular thermal compound (not adhesive). The tough part is making it so the board doesn't move around with bumps and vibrations. Thermal compound loses its efficiency if it gets moved around a lot once applied...

[Procharged5.0]

It would make more sense to me to use thermal paste and bolt/screw/clamp the fets to it rather than the method they are currently using. That might necessitate a larger case which they were probably trying to avoid.

[BrianG]

It's issues like this that make me want to design my own ESC: Mamba Max programming, BK36120 cell count, MGM160 current rating, and a case all of my own design where ALL FETs are mounted to Aluminum that is part of the external case.

[Procharged5.0]

Sold! Send me two of them!

[coolhandcountry]

Why not build it with the 40.160 schulze cell capablity?
It just looks like a big pancake.

[BrianG]

@ProCharged: I think we can all agree on what an ideal high-powered ESC should be like. Now, why can't manufacturers deliver??

@CHC: Ok, sounds good. 40 cells it is!

[Procharged5.0]

[QUOTE=BrianG]@ProCharged: I think we can all agree on what an ideal high-powered ESC should be like. Now, why can't manufacturers deliver?? QUOTE]

Excellent question! My gut feel on the upcoming MMM is that it will be close.

From conversations with Shawn and others it would seem likely that the MMM would be rated for more than 150A (could be as much as 200A but I'd wager on 175-180A) and for 24v.

That would fit all my needs for the forseeable future!

I think the MMM should have a better heatsink/case design than the MM though to dissipate more heat. I think it should be designed to dissipate 3+ times what the MM does now.

[Serum]

The answer is here my friends..... AVAILABLE AS WE SPEAK...

15S lipo (45 old school cells) 100 percent waterproof, with an easy to use programming card.. (you don't need a PC with software with this baby)

200A for 15 seconds.. Fan installed standard..

answer is..

Kontronik Power Jazz 63V..
price is about 430 dollars..

[Dafni]

Serum, sounds A LOT like the new BK controllers! :010:

[Procharged5.0]

Interesting piece. Does not appear to be available in the US.
Has lots of great features but limited programmability. Great protection features too.

I thenk the MMM will ultimately outperform it. (maybe not 15S though!)

[Dafni]

If I remeber correct, the Kontronic has no proportional brakes. I may be wrong, though.