So the problem is the following: I assembled DJI F450 quadcopter from ARF kit as per tutorial on this resource and decided to calibrate ESCs. Because All-At-Once method wasn’t working very properly (one motor wasn’t spinning), I decided to do manual One-By-One calibration by directly connecting receiver to ESCs as per this article: copter.ardupilot.com/wiki/esc-calibration/.
All ESCs were successfully calibrated using this method and everything worked like a charm.
Then I proceeded to switching direction of one motor by switching randomly chosen 2 bullet connectors between ESC and the motor. Please refer to the picture attached - this is the picture of fried ESC which was working correctly before.
So, after switching 2 cables I connected battery once again and started playing with throttle to check if motor spins in correct direction. It indeed was normally spinning in the other direction, however after about 1 minute it suddenly stopped and ESC started smoking.
Basically I see 3 reasons for this:
1. Due to bad quality of ESC - this was cheap ARF kit bought from China and I heard about problems with such (however it worked fine after first calibration)
2. After switching 2 wires going to motor I didn’t perform calibration once again - is this needed? Could this be the cause
3. I have just realized another stupid reason for that - because I’m newbie, I was checking motor spinning direction by putting fingers on the motor, slowing it down. This was working fine, however maybe being very happy I pressed my finger against motor to hard causing it to stop and I read that this may cause ESC to fry.
Could you please advise which reason is the most likely one, because I don’t want to fry another ESC
Thanks a lot for any help