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Originally Posted by BrianG
I don't see why those caps don't work right. Maybe it is the temperature since the traces may get quite warm and the heat will tend to be sinked through them.
High speed caps would be more of an issue for oscillator or high frequency filter, but I think (please correct me if I'm wrong) those caps are actually to provide a little amperage oomph during high current spikes.
Anyway, it will be interesting to see how those new caps work. If you are concerned about the working voltage, I found some inexpensive ones here. Temp ranges from -40 to 85C. These are from partsexpress so they tend to use the higher quality caps for use in audio crossovers so they may be faster switching as a result even though they don't specifically say that. |
Honestly I don't know why they are used as such. But pulling the Rubycon part # off the caps, the spec sheet lists the caps as high freq switching (or whatever exactly.) I'm just trying to replace the caps with as close a match as possible. The whole spec was 220uf, 50V, 105C. The allelectronics caps I bought are exactly that. If that does not correct teh problem (I'm worried it may not) I will have no choice but to sent it off. My best hope is that it is the caps as its something I can repair cheaply.
I know what you are saying about the amp spikes, but on the other hand I don't know why BK would have used 4 small caps for that. It seems easier and more reliable to have used 1 large cap. The caps are only 220uf, so they aren't really that large at that. When one of the caps was bad, the esc did not work properly at all.
I'm concerned about the heat build up, something is casuing a high amp draw.I don't see it being the setup. It got warm even whenI tested it in a 2 min drive in my rusty. Worst case would be some internal short Would a bad FET do something like this? Dunno, I don't see a whole lot else there. Nothing smaoking or burning, so not a whole lot for me to go off of. I have a feeling there is more power there too which is not getting to the wheels. I would think the 8xl/16 cells could break 40. Its still off that by a bit. We'll see what Monday brings I guess.
In the meantime I've got to figure out a roll bar. I don't want to crush the motor or esc on a bad flip or landing. The stock body is pretty light& flimsy and doesn't offer a whole lot of protection in a crash. When I get everything together I'll put up some more pics.