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(1) Before disassembly, blow the dust on the surface of the motor with compressed air and wipe the dirt off the surface.

(2) Select the working place for motor disassembly and clean up the site environment.

(3) Familiar with motor structure characteristics and maintenance technical requirements.

(4) Prepare tools (including special tools) and equipment required for disassembly.

(5) In order to further understand the defects in the operation of the motor, if possible, an inspection test can be conducted before disassembly. Therefore, put the motor on the load for test run, check the temperature, sound, vibration and other conditions of each part of the motor in detail, test the voltage, current and speed, then disconnect the load, conduct a separate no-load inspection test, measure the no-load current and no-load loss, and make records.

(6) Cut off the power supply, remove the external wiring of the motor and make records.

(7) Select a megger with appropriate voltage to test the insulation resistance of the motor. In order to compare with the insulation resistance measured during the last maintenance to judge the insulation change trend and insulation state of the motor, the insulation resistance measured at different temperatures shall be converted to the same temperature, generally to 75 ℃.

(8) Test absorption ratio K. When the absorption ratio is greater than 1.33, it indicates that the motor insulation has not been affected by moisture or the degree of moisture is not serious. In order to compare with the previous data, the absorption ratio measured at any temperature should also be converted to the same temperature.