Brushless DC motor common knowledge

(1) Before disassembling, use compressed air to blow the dust on the surface of the motor and clean the dirt on the surface.
(2) Select the workplace where the motor is disassembled and clean the site environment.
(3) Familiar with the structural characteristics of the motor and technical requirements for overhaul.
(4) Prepare tools (including special tools) and equipment required for disintegration.
(5) In order to further understand the defects in the operation of the motor, a check test can be conducted before disassembly in conditions. For this purpose, the motor is loaded with a load and tested, and the temperature, sound, vibration, etc. of each part of the motor are examined in detail, and the voltage, current, and speed are tested. Then the load is disconnected and a no-load inspection test is performed independently to measure the air. Load current and no-load loss, make a record.
(6) Turn off the power, remove the external wiring of the motor, and make a record.
(7) Select the appropriate voltage megohmmeter to test the motor insulation resistance. In order to judge the insulating tendency and insulation state of the motor in comparison with the insulation resistance measured during the last inspection, the insulation resistance value measured at different temperatures should be converted to the same temperature, which is generally converted to 75°C.
(8) Test absorbance ratio K. When the absorption ratio is greater than 1.33, it indicates that the motor insulation has not been affected by moisture or moisture. In order to compare with previous data, the absorption ratio measured at any temperature is also converted to the same temperature