How to judge the rotor and stator of Bosch electric pick

The method of judging the rotor is as follows: first, don't disassemble the machine, try to plug it in, idle, see if the spark of the motor is big or not, 90% of the rotor is broken, and judge whether there is any problem with the stator, mainly by plugging it in to see if it is electrified, because the stator can only play the role of magnetic field. If there is nothing wrong with the stator, the rotor will work normally after being electrified. Bosch's tools are basically 2-3. If there are problems with rotors, the original rotors are more expensive. Hope to adopt!