What to do before servicing a brushless DC motor?

A. Before you plan to remove the bldc motor, you need to clean the motor surface dust, and wipe the surface dirt clean.

B. Select the working place suitable for motor disintegration and clean up the site.

C. Familiar with motor structure characteristics and maintenance technical requirements.

D. Prepare the tools (including special tools) and equipment needed to disassemble the motor.

E. In order to further understand the defects in the operation of the motor, you can do an inspection test before disassembly if possible. To this end, the motor is put on the load test, check the temperature, sound, vibration and other conditions of each part of the motor in detail, and test the voltage, current, speed, etc., and then disconnect the load, do a separate no-load inspection test, measure the no-load current and no-load loss, and make a record.

F. Cut off the power supply, remove the external wiring of the motor, and make a record.

G. Select a suitable voltage megohm meter to test the motor insulation resistance. In order to compare the insulation resistance value measured at the last maintenance to judge the insulation trend and insulation status of the motor, the insulation resistance value measured at different temperatures should be converted to the same temperature, generally converted to 75 ° C.

H. Test absorption ratio K. When the absorption ratio is greater than 1.33, it indicates that the motor insulation has not been damp or the degree of damp is not serious. For comparison with previous data, the absorption ratio measured at any temperature is also converted to the same temperature.

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