This post is to summarize a rare issue that can happen to any of you using ESC32. This happened to me and some other testers several times with very bad consequences, as you can image.
This problem happens usually with long signal lines (when you put the ESC32 below the motor) and for prop size > 12" and above Throttle 50% (> ~25A). Me personally only have this issue when using CF tube arms, cabling inside. Using ALU arms even longer, cabling outside tube, never saw the problem.
First of all some words from Bill (the ESC32 creator):
"We are not dealing with a complete, final product when building multi rotor's. Each build can be drastically different yet the FC is expected to perform well in every situation. For the most part it does, but you should not be surprised when a particular build runs into a problem. I know how much it hurts when a lot of expensive hardware plows into the ground - probably more than most do. I tend to either fly cheap, easy to replace components and/or spend a lot of time at low altitude with low risk maneuvers with the more expensive hardware until I have the many hours needed to start to trust it. Of course, it's even riskier when you are flying code that you just came up with an hour earlier."
Solution:
- to use shielded PWM cable, and add a 10nF cap to the ESC32 PWM IN to GND
Hope this helps
Angel