Here is a pic of the motor coil. I can't show you the bolts below because after the crash I installed PhantomGuard protectors. I needed to carve a little around the affected bolt holes where plastic had melted to install them.
Sent from my iPhone using PhantomPilots mobile app
Yikes - those motors got hot - too hot.
The "black smoke" you mentioned is very likely the insulation burning off the copper coils (
shellac or varnish coated). When the motor is prevented from rotating, i.e. the props are stalled
(props dug in) the energy flowing to the motor is not removed - hence a quick build up of heat at the motor windings! Couple that with the fact the props are not doing their secondary job - helping keep the motor winding cool (
reason for the open motor frame).
The copper wire is coated providing insulation from one turn to the next - without that (
which you have partially lost) the overheating at the coil will lead to a dead short, destroying the coil (
which you are close to now). Eventually that wound copper wire will become one solid chunk of copper and heat dissipation (
energy) is lost - resulting in a burned out motor!
This is not the best advice and only given as relative to your situation.
Right now you have a few turns of the copper wire left with insulation (
remember the copper wire / winding is there also to dissipate excess energy which creates heat). Suggest you don't fly for any extended period of time and if ambient temperatures are high - cut down on flight time even more. After you land - let the motors (
with props) idle for a short time to help cool the windings prior to complete shutdown. If you have access to any motor winding shellac, varnish or even some "non-conductive" paint you could remove the motor and coat what you can see of the windings (
clean up the burnt areas first). This would be only a temporary fix - as is motors should be replaced as soon as you are able to.