Hughie said:I guess the real issue here, is that if you stall a motor the drop in back-EMF is likely to damage the ESC. Usually it is instantaneous, but there is no reason to assume that damage has not been done to an ESC which appears OK after an incident, it could then fail at a later time.Andrey320 said:So I guess I'm not the only one this has happened to....
Warning: leaving the motors running after landing or trying to take off again landing (without shutting down / restarting) may cause a tip-over or crash.
It has been suggested that the same is true if a motor stalls in flight (for example by making abrupt changes in direction), i.e. it could be possible to damage or destroy an ESC whilst in the air.
I too suffered a tip over on my first or second flight. Luckily for me the ESC was fried so I did not have the option of attempting another trip with it.
Note that stalling the motor and taking out the ESC is an inherent design issue of the hardware and is not considered to relate to the recent ESC/motor upgrades.
Are you saying that by a rotor turning backward, that would damage the ESC? If so, what makes it turn backward? I don't know how an electric motor "stalls." It is either on or off. Are you speaking of a high speed shut off?
I'm not challenging you, I'm just tying to understand what you meant. . If there is a such a problem, a rectifier, that is rated for the current, could be installed on the positive or negative, or both leads. This would block a reverse voltage coming back to the ESC.
If you mean a single spike, it would still work, but so would a capacitor (non-electrolytic). Also, other components and circuits could do the job. A Zener diode could be employed, etc. But, is there REALLY such a problem? If so, I could design a fix.