New 100a reversible car esc on hobbycity

[lincpimp]

Originally Posted by Byte

I still don't get why you hate fans, could you explain it please?

He just wants stuff to be designed to handle the load without needing forced airflow. If the fan breaks (and they do) the esc should be able to handle it. No too much to ask, IMO.

[BrianG]

Not only do I want it, I demand it!

There is a time and place for everything, but fans do not belong in R/Cs unless they are being run with improperly chosen components and/or extreme running conditions (and that could be cured by component upgrade). Bottom line; if things run hot and you don't want to sacrifice speed/performance, get better/more suitable parts.

Like anything else, if you run things to just below their breaking point, there is no room for error. All it takes is maybe a little over-engineering and you'd be golden. This hobby is definitely not one of those places where you can cheap out and expect great results.

[lutach]

Originally Posted by BrianG

Not only do I want it, I demand it!

There is a time and place for everything, but fans do not belong in R/Cs unless they are being run with improperly chosen components and/or extreme running conditions (and that could be cured by component upgrade). Bottom line; if things run hot and you don't want to sacrifice speed/performance, get better/more suitable parts.

Like anything else, if you run things to just below their breaking point, there is no room for error. All it takes is maybe a little over-engineering and you'd be golden. This hobby is definitely not one of those places where you can cheap out and expect great results.

Schulze L, XL, XXL, Jeti SPIN200, SPIN220, SPIN300, Kontronik Jive and not 100% sure if MGM is reliable without a fan . I've been told by a few that to make such a ESC it would cost beyond what most in the hobby is willing to pay. There are awesome materials available now that are being mostly used by the world's military. Maybe all we need is a thermal engineer to come up with a dynamic new way to cool these amazing little devices. I have my ideas (GriffinRU is very knowledgeable on this matter) and so do most in this forum, but we can't make it and have to rely on the current manufacturers to make them for us lol. Also, with most ESC that doesn't use a fan, you better have room in your vehicle for it as they can be a little on the big side.

[BrianG]

Pah, even my Quark 125B's run cool, and they are known for running warm. Just a little added heatsinking and some decent airflow are all that's needed. After all, these are moving vehicles and movement creates airflow.

All it takes for a cooler ESC is better FETs (easier said than done, eh?). Something with less rdson, and more importantly, a higher slew rate. I don't think it will be too long before this is a reality given the advances in technology and manufacturing processes. Heck, you could just take today's FETs and stack them without any heatsinking. Just doubling the count would reduce the heat by half for a given current. So, instead of coming up with newer FETs that have more ideal specs, why not simply use more of the ones we already do have? Some of them (like on the MM/MMM) are small enough to piggy back easily. Might drive the cost up a bit, but if bought in bulk, they would be cheaper than getting a more advanced FET.

[lutach]

Originally Posted by BrianG

Pah, even my Quark 125B's run cool, and they are known for running warm. Just a little added heatsinking and some decent airflow are all that's needed. After all, these are moving vehicles and movement creates airflow.

All it takes for a cooler ESC is better FETs (easier said than done, eh?). Something with less rdson, and more importantly, a higher slew rate. I don't think it will be too long before this is a reality given the advances in technology and manufacturing processes. Heck, you could just take today's FETs and stack them without any heatsinking. Just doubling the count would reduce the heat by half for a given current. So, instead of coming up with newer FETs that have more ideal specs, why not simply use more of the ones we already do have? Some of them (like on the MM/MMM) are small enough to piggy back easily. Might drive the cost up a bit, but if bought in bulk, they would be cheaper than getting a more advanced FET.

I like stacking power boards lol. I was told by the manufacturers that stacking would cause excess heat, well they are learning from a non engineer lol. All the stacked ESCs I have have shown much improvement and run much cooler then the single power board version. I got to see if it's possible to triple of even quadruple stack them lol. Crap why stop there, could even make a tower of terror lol.

[BrianG]

Heat buildup in a stacked setup is a poor excuse. Just do something like what CC does on their HV110.

[Metallover]

Is it possible to buy and modify an existing esc by just stacking fets? Say I got this 100a esc, took off the heatsink, then stacked another layer of fets on there, then properly re-attached the heatsink. Would I see lower temps and higher amp handling capability?

[What's_nitro?]

Originally Posted by BrianG

Heat buildup in a stacked setup is a poor excuse. Just do something like what CC does on their HV110.

Or the dual-heatsink MGM's. Which in my experience run great without fans.