Team Tekin R1 Pro brushless speed controller

[Mike.L]

no heat sinks, dunno doent sound to safe to try 5s with then... but if it claimes it can...then it should.

[BrianG]

It's not so much the high voltage or the current that causes the heat on the ESC, it's the time that there is a voltage drop on the FETs when current passes though it that causes the heat. And this happens mostly during the very short time it takes for the FET to switch on and off.

If the FET had VERY fast switching times, very low "on" resistance, with almost no rise time delay, and enough of them were in parallel (to further reduce the "on" resistance), it is possible I suppose to run an ESC without a heatsink.

For comparison: The MM specifies an "on" resistance of 0.0003 ohms. That's 0.03v dropped on it at 100A, which is 3W dissipation. Since that is kinda low to produce the heat we see on these ESCs especially since we never draw 100A continuously, I would say that the FETs have some type of slope when they switch on and off, which would account for the extra heat.

The R1 pro specifies the on resistance of 0.00005 ohms. That's 0.005v dropped on the ESC at 100A, which is 0.5 watts!

Based on the fact that the "on" resistance is 6 times lower than the MM alone, it should maybe run a little warm without the heatsink.

I have faith in Tekin. I love there mini rage esc; I have pushed that little 25a esc on 4s with internal bec for about an hour with a 6800 motor. Temps at the end of the run were around 150f on the esc with no heatsink....

Bye:018:

[jhautz]

But on an esc with a heat sink, you at least know you can add a fan blowing on the esc if there are heat problems. If its in a closed plastic case, you cant even blow a fan on it to keep it cooler.

I talked to these guys at the iHobby show. They have a cool feature on these ESCs. There is a built in temp monitor like most ESCs, but this one has a led that blinks to tell you how hot the esc is. If its blinking faster its hotter. Now if there wasnt going to be heat issues, why would they bother with that.

Its still a cool feature...


EDIT: another thing I jsut noticed. The specs say its 5s capable, but the highest LVC setting is 12.5V. Why wouldnt they have a 15V cutoff if its 5s capable?

[BrianG]

Originally Posted by jhautz

...EDIT: another thing I jsut noticed. The specs say its 5s capable, but the highest LVC setting is 12.5V. Why wouldnt they have a 15V cutoff if its 5s capable?

Maybe they rated their voltage capacity using the same method that Quark used to rate the 125B as 6s? :005: