We'll go over a few things you should know before taking a brushless DC motor apart and fixing it here. I hope it's useful.

(1) You should dust and wipe the motor's surface to remove any dirt before attempting to disassemble it.

(2) After deciding on a good working location, tidy up the area before disassembling the motor.

(3) Understand the motor's structural features and technical maintenance requirements.

(4) Assemble the equipment and tools needed to disassemble the motor, including any specialized tools.

(5) Before disassembling the motor, if at all possible, conduct an inspection test to gain a deeper understanding of the operational flaws. In order to achieve this, load the motor for a test rotation, measure the no-load test, disconnect the load, and carefully inspect and check every component of the motor—including its temperature, sound, vibration, and other characteristics—as well as its voltage, current, and speed. Note the no-load loss and the load current.

(6) Turn off the power, unplug the motor's external wiring, and take notes.

(7) To test the motor insulation resistance, use a megohmmeter set to the proper voltage. The insulation resistance values recorded at various temperatures should be converted to the same temperature, usually 75°C, in order to compare with the insulation resistance value recorded during the most recent maintenance to ascertain the motor insulation change trend and insulation status.

(8) Evaluate the K absorption ratio. A higher absorption ratio than 1.33 suggests that moisture has never impacted the motor insulation or that the level of moisture exposure is not very high. The absorption ratio measured at any temperature must also be converted to the same temperature in order to be compared with earlier data.