How to detect whether the motor has been burned?

Three steps to detect whether the motor is normal or not:One look,two turn,Three measurement

A look

from the locking screw hole to see if there are traces of burned black

 

Two turn.

Take the motor in the hands according to the following steps to turn.
Take the three thick wire in turn, two by two, turn the motor if you feel the feeling of jamming, and then the three wires together, and then turn the motor if you feel considerable resistance, and even, in this case, the motor is not burned.


Three measurements.
Then use a multimeter to measure the resistance between the three phases of A/B/C, AB, BC, AC is equal. If the difference in resistance between the three phases is relatively large, such as a difference of more than 15%, the motor coil may have problems