Compressor motor damage
The damage of the motor is mainly caused by the insulation (short circuit) and open circuit of the stator winding insulation. After the winding is burned, some phenomena or direct causes of burning are covered, which makes the post-mortem analysis and cause investigation difficult. The faults are as follows: the contactor frequently picks up or burns, the overcurrent protection or the built-in protection of the compressor, the trip of the power switch, and the temperature of the compressor cavity are too high.
the reason:
Burning or abnormality of contactor contacts, such as phase loss and phase deviation.
The rated voltage of the power supply cannot exceed ±10%.
The three-phase voltage imbalance rate cannot exceed 3%.
When the voltage is unbalanced, the load current is 4-10 times that of normal operation.
All of the above reasons have the potential to cause the worn metal chips to break the insulation of the coil and burn the motor.
Insufficient cooling of the motor, large leakage of refrigerant or low evaporation pressure will cause the system mass flow to decrease, making the motor unable to get good cooling.
