Maintenance Of Electric Motor

Preparation and inspection before startup

1.Check whether the grounding of motor and starting equipment is reliable and complete, and whether the wiring is correct and good

2.Check whether the rated voltage and rated frequency shown on the motor nameplate are consistent with the power supply voltage and frequency

3.For newly installed or long-term shutdown motors (shutdown for more than three months), the insulation resistance values of winding phase to phase and phase to ground shall be checked before startup. (Measure with 1000 V megohmmeter). The insulation resistance should be greater than 0.5 megohm. If it is lower than this value, the winding should be dried.
4. For the wound rotor, check whether the brush on the collector ring and the brush lifting device can work normally and whether the pressure of the brush can meet the requirements. The brush pressure is 1.5Ncm-2.5Ncm.

5.Check that the rotor of the motor can rotate flexibly and reliably, and the oil in the sliding bearing can reach the specified oil level.

6. Check whether the rated current of the fuse used by the motor meets the requirements.

7. Check whether the fastening bolts and mounting bolts of the motor are firm and meet the requirements.

If the above inspection is up to standard, the motor can be started. After the motor is started, the motor can be operated without load for 30 seconds. Pay attention to observe whether the motor has any abnormal phenomenon, noise, vibration, heat and other abnormal conditions, and take measures to check the causes of the situation. The motor can only be operated after the problem is solved. When starting the wound motor, the starting rheostat should be connected to the rotor circuit. For motors with brush lifting mechanism, put down the brush, disconnect the short circuit device, close the stator circuit switch, and pull the rheostat. When the motor approaches the rated speed, lift the brush, close the short circuit device, and the motor starts.

SIVO Motor has a technical management team with strong professional skills and management ability. The main products include iron shell single three-phase asynchronous motor series, aluminum shell single three-phase synchronous motor series, fan special motor series, variable frequency motor series, permanent magnet DC motor series, etc. Welcome to contact us with any motor problems.