The motor of the vacuum cleaner is broken. How to check whether it's the carbon brush or the winding?

If it is found that it is only broken during use, unplug the power plug and touch the motor to see if the temperature of the whole motor is high or only in the part where the carbon brush is installed. If it is the former, most of the motor windings are damaged due to turn-to-turn short circuit. If it is the latter, the carbon brush is generally damaged, resulting in serious fire and rising temperature. In addition, if it is found that the speed drops and the motor is weak during use, the winding insulation is generally damaged, leading to faults such as turn-to-turn short circuit. If it is found that the carbon brush is obviously ignited during use or when the dust storage cylinder of the vacuum cleaner is opened, and the temperature in that place rises rapidly, it is generally that the carbon brush is damaged or badly worn and needs to be replaced immediately, otherwise it may damage the commutator (commutator) and further damage the motor winding.