To activily control the power output due to heat dissipation I installed 2 NTC sensors. One for the motor and one for the ESC. As the heat dissipation is slow, there has to be an offset for the cut-off temperature. I tried several configurations and about 45ºC gives good results for motor and for ESC. The real temperatur of the motor is about 80ºC when the sensors gets to 45ºC.
The motor is than powered down in a cooling mode, not completly shut-off. For about 2 minutes the motor can only run with low RPM and the small propellers realy cool down the motor.
Here is the photo of the motor rod with the ESC and NTC sensors.
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