MMM guts?

[lutach]

Originally Posted by BrianG

The trouble with TECs is that they require between 3-5A by themselves to operate, which would reduce runtime...

Yes, but that AMP rating seems to be the MAX on most units depending on the voltage you use. You can get away with a Rx pack or a small lipo for around 15-20 minutes bash or race. The ones I have only drew around 1A max to provide plenty of cooling and it did not reach it's max cooling and that's not even with a decent heat sink on it. You can even get a TEC with a thermal management unit that will only activate the TEC when things reach a certain temperature. That's the route I'll be going. I was planning on using water cooling, but the TEC seems a better device for cooling.

[GriffinRU]

Originally Posted by lutach

A small TEC on top of a copper plate and the MMM heat sink on top of the TEC will make a nice none moving set up. That what I plan on doing when all the bugs are fixed and CC comes out with the 8S or 12S unit. They are the perfect size for the TECs I have.

TEC's are not efficient, you will loose more than gain.
I am working with TEC's for more then 10 years...

Heat-pipes or ... I will keep for myself

CC - nice TVS, did you missed my mods to your MM or ignore it at all when you designed MMM????? Poor judgement!!!

I will bring you modded MMM later next week without fan, and later Tekin R1Pro in works as well. Actually I think Tekin is the monster with proper cooling and MMM is just a joke. I can get the same performance with modded MM, so CC wasted their attemp in building monster ESC, while they can just update software and replace BEC or leave it alone, as BrinG recommends.

BrignG here is new toy for you :)
Luciano you can play with it as well and can verify TEC's requirements and problems.
-This is beta version and updates will follow with graphs and esc's

[lutach]

Originally Posted by GriffinRU

TEC's are not efficient, you will loose more than gain.
I am working with TEC's for more then 10 years...

Heat-pipes or ... I will keep for myself

CC - nice TVS, did you missed my mods to your MM or ignore it at all when you designed MMM????? Poor judgement!!!

I will bring you modded MMM later next week without fan, and later Tekin R1Pro in works as well. Actually I think Tekin is the monster with proper cooling and MMM is just a joke. I can get the same performance with modded MM, so CC wasted their attemp in building monster ESC, while they can just update software and replace BEC or leave it alone, as BrinG recommends.

BrignG here is new toy for you :)
Luciano you can play with it as well and can verify TEC's requirements and problems.
-This is beta version and updates will follow with graphs and esc's

The one thing I found with TEC, is that to get the best of it one will need to use a very large heat sink. I might be wrong, but I like to explore all the options available and maybe hit the jack pot. I can't wait to see what you got cooking with the 2 controllers.

[jhautz]

I'd ike to see the R1Pro mods you are working on. I agree that it is the better controller of the bunch. At least from a drivers perspective. Its very smooth and very small. I have already considered opening mine up and installing my own heat sinks. Even still I hace run the R1Pro very sucessfully in a 1.8 buggy on 5s without need for additional cooling. However I was concouis of the size and lack of heatsink so I set up a fairly mild system on it. It was still more than enough power for the track though, but I could see some anting more than I had running on it. I'm sure it could take more also, I just havent pushed my luck with it yet.

If you come up with a mod for it, let me know. Id be happy to send you mine and be a beta tester for you.

[GriffinRU]

Originally Posted by jhautz

I'd ike to see the R1Pro mods you are working on. I agree that it is the better controller of the bunch. At least from a drivers perspective. Its very smooth and very small. I have already considered opening mine up and installing my own heat sinks. Even still I hace run the R1Pro very sucessfully in a 1.8 buggy on 5s without need for additional cooling. However I was concouis of the size and lack of heatsink so I set up a fairly mild system on it. It was still more than enough power for the track though, but I could see some anting more than I had running on it. I'm sure it could take more also, I just havent pushed my luck with it yet.

If you come up with a mod for it, let me know. Id be happy to send you mine and be a beta tester for you.

Go ahead you won't be dissapointed. If you make report on performance I will do that for free.

[GriffinRU]

Originally Posted by lutach

The one thing I found with TEC, is that to get the best of it one will need to use a very large heat sink. I might be wrong, but I like to explore all the options available and maybe hit the jack pot. I can't wait to see what you got cooking with the 2 controllers.

For best performance you need to dump heat into cold, i.e. keep temp diff as low as possible. They are heat-pumps but their efficiency locked to temp differential between cold and hot. With passive cooling (convection, radiation) it is hard to maintain (not achive) high/good efficiency. Also they tend to delaminate under vibration...

Where you get controllers from? Links, specs, send me some info.

[BrianG]

From what I've read/seen of TECs, they are OK if efficiency is not a concern and in certain applications. However, in R/C, efficiency means a lot. We want max cooling AND max efficiency AND durability and and and and. We don't ask for a lot.

I still think a slightly larger heatsink that is properly placed to take advantage of the natural airflow inherent in a moving vehicle will work wonders without exotic cooling methods. Seems like any other solution has major disavantages that keep them from being a practical cooling solution.

Originally Posted by GriffinRU

BrignG here is new toy for you :)

Oooh, a new toy! Too bad I can't download it until tomorrow night (using my G/F's Palm Treo as a modem and is limited to a single 17MB download).

[jhautz]

Originally Posted by GriffinRU

Go ahead you won't be dissapointed. If you make report on performance I will do that for free.

You have a PM.

[BrianG]

Artur, from what you've seen on the MMM so far, is there a way to save an ESC when the BEC fails without sending it in for repair? Like maybe disconnect a BEC component and then use an external one? I've heard a few people blow a repaired ESC which leads me to believe the issue isn't totally worked out yet. I'd rather take a hit on the warranty and mod it then send it in again. Besides, I've already modded it to my liking.

[GriffinRU]

Originally Posted by BrianG

Artur, from what you've seen on the MMM so far, is there a way to save an ESC when the BEC fails without sending it in for repair? Like maybe disconnect a BEC component and then use an external one? I've heard a few people blow a repaired ESC which leads me to believe the issue isn't totally worked out yet. I'd rather take a hit on the warranty and mod it then send it in again. Besides, I've already modded it to my liking.

If you remove inductor then you should be fine using external BEC, but the best would be to remove lm3485 and 2 fets.

[BrianG]

Well, I was kinda hoping I could just cut a trace or two, but that would work.