Professional Carrier Maintenance06TRe-winding of screw compressor coil due to burnout, and replacement of bearings.

Carrier06TScrew Compressor Maintenance Analysis:

Analysis of Carrier Compressor Motor Failure Causes

On-site inspection reveals wear (scuffing) between the stator winding and stator, causing partial winding short-circuit in the stator winding..Grounding phenomenon

Several possible reasons may account for this phenomenon:

1.The compressor winding is worn out over the long-term use, leading to damage and causing the stator's armature to deviate from the concentric point, resulting in the motor's swept-pole condition.

2.During compressor startup, the refrigerant oil is too thick (due to inadequate heating or no heating of the oil heater), resulting in insufficient lubrication of the bearing area and causing bearing damage, leading to motor shaft scuffing and burning of the coil winding.

3.During the compressor's operation, the liquid refrigerant enters the compressor, causing the return gas temperature to be too low, which thickens the engine oil. The bearings fail to receive adequate lubrication and become damaged, leading to the motor's cylinder bore being scraped.

4.The quality assurance in the refrigeration system increases bearing load-bearing capacity, leading to greater friction and causing motor shafting and bearing damage, resulting in motor skirt wear.

Summary: The above reasons indicate that the motor's armature damage is due to the burning of part of the winding coils, caused by various reasons related to the bearing.