1. Appearance inspection:
 
1. Check whether the explosion-proof motor shell has cracks, open welding, deformation, whether the spare parts are complete, and whether there are any damages.
 
2. Check whether the fasteners of the explosion-proof parts of the explosion-proof motor are complete, and whether the fastening screws and holes have slip buckles.
 
2. Rotor inspection: After pulling out the rotor, remove the inner and outer small covers to check whether there is any damage. The rotor squirrel cage bars and end rings are welded firmly and reliably, and there must be no open welding or false welding.
 
3. Bearing inspection: Remove the backrest wheel to check whether there is any damage, remove the bearing, check whether there are any cracks, peeling, pitting, discoloration and rust. For more information about explosion-proof motors, please contact Wolong Nanyang explosion-proof motor manufacturer.
 
4. Explosion-proof motor stator inspection:
 
1. The stator core and winding surface are clean, and the winding is insulated. There should be no obvious damage and changes.
 
2. When all windings are rewound, the insulation level, winding pitch, wire cross-section, etc. should be the same as the original design.
 
3. Number of immersions: immersion should be no less than 3 times.
 
5. Explosion-proof motor cooling system: Check that the water circuit of the water-cooled motor is unobstructed, the seal is intact, there is no leakage, and do a good job of water pressure test.
 
6. Explosion-proof motor explosion-proof surface inspection: The repair of each explosion-proof part of the explosion-proof motor complies with the GB3836.2-2000 standard.
7. Test:
1. Insulation resistance value of the winding: should be lower than 5MΩ (660V, 380V), 1140V not less than 10MΩ.
2. Withstand voltage test: 380V-2000v/min, 660V-2500v/min, 1140V-3000v/min.
3. No-load test: The unbalanced value of the three-phase no-load current does not exceed 10%, and the operation is stable without abnormal noise.