Quote:
Originally Posted by digitalsolo
I have similar behavior on my Baja with an XL2 as well. I'm going to be adding a cap pack and an external BEC this weekend to see if it clears it up. It's not quite as bad as this one shows, but it's very noticeable, especially about 5-6 minutes into a run.
I will update with regard to improvement after the change.
|
On my Mamba Monsters I could also observe cogging that looks and feels the same as the XL2 cogging, although not as bad. It seems it is connected to ESC temperature somehow. After I removed the case from my ESCs and put a bigger fan on them, the cogging was reduced significantly.
Here's what I found out about the XL2:
The two parts of the cases are glued to the PCB with thermal glue that doesn't hold on too strong. With the ESC that I got, the bottom half almost fell off on it's own and there was dirt on the thermal glue, so it wasn't really sticking anymore. I have seen the same on rcs2022's pics of an opened XL2 here on the forum, one could see dirt there also, so it must have seperated before. The plastic case around the heatsink case holds the two parts together, but it doesn't apply pressure which is needed to keep everything tightly together for good heat conductivity between the PCB and the heatsink.
Also, the fan cannot be very effective, the grill on it doesn't allow for good airflow and the upside of the ESC casing also doesn't allow for good airflow.
You could try the following to fix the cooling:
1. Remove the plastic casing and clamp the two case halves together using some threaded rods in combination with braces.
2. Use a big (60x60 or 80x80) high-flow fan and mount it half an inch or so higher (not directly on top of the ESC case).