Shandong ReeWo hydraulic technology co.Ltd.
Maintenance of DC Motors During Operation
Release time:
May 30,2019
Author:
For DC motors in operation, regular maintenance is essential to promptly detect any abnormalities and eliminate potential hazards, thereby ensuring the motor’s long-term safe and reliable operation.
1. During operation, the motor should have its various components—such as temperature, vibration, sound, and commutation—checked regularly. Attention should also be paid to any signs of overheating, discoloration, or the smell of burnt insulation.
2. Use a listening rod to check the sounds of each component, and determine whether there are any friction noises between the rotor and stator in addition to electromagnetic and ventilation noises. Also, check whether the bearing shells or bearings produce any unusual sounds.
3. Inspect the connection points and insulators of the main circuit. Pay attention to any signs of overheating discoloration or abnormal odors such as burnt insulation.
4. To prevent the motor from overloading, always pay close attention to the motor’s current and voltage levels. For DC systems equipped with insulation monitoring devices, regularly check the insulation condition relative to ground.
5. For closed-loop cooling systems, attention should be paid to water levels and air temperatures. Additionally, check whether the cooler is leaking or fouled, and verify that the ventilation network is free of blockages or obstructions.
6. Check whether the color of the oxide film on the commutator surface is normal. Observe whether there are sparks between the brushes and the commutator, whether carbon dust and oil deposits have accumulated on the commutator surface, and whether there is any dust accumulation on the brush holder and brush grip.
7. Check whether the commutator shows uneven wear, whether its flatness exceeds the allowable tolerance, and whether the mica between the segments protrudes, causing electrical sparking and vibration.
8. Inspect the brush and brush harness of the gun to ensure they are intact, with no breaks or strand fractures. Verify that the connections to the brush holder are secure and check for any grounding or short-circuit conditions.
9. Check whether the carbon brushes or brush leads have discolored due to overheating, and whether the brushes are stuck or wobbling within the brush holders.
10. Check whether the brush pressure between each brush is uniform and whether the pressure fingers are properly secured.
11. Check whether the edges of the carbon brushes are chipped or damaged to the shortest allowable length.
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