Hey,my motor is working great with mystery 50A ESC, and 11.1v 1800may battery
But it is also getting hot,after a while.

all motors will get warm after normal use.  if it's hot outside, all motors will get hot with normal use.  you have to use it within its heat limits.

QuoteFirst:
Disconnect the motor (ISOLATE ALL THREE WIRES FROM EACH OTHER!) from the ESC
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If so, you've got a shorted winding or two, you've got a real problem.
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If so, it can result in the magnets hitting the stator.

i did the above test and the motor dint heat up..
so does it mean its working fine for now??