What are the common high-voltage explosion-proof motor failures?

In the natural gas and coal mining industries, what are the common high-voltage explosion-proof motor failures, and what technical means can be used to effectively detect and diagnose these failures?

In the natural gas and coal mining industries, common failures of high-voltage explosion-proof motors and corresponding detection and diagnosis technologies include:

Common failures
Insulation aging and damage
Causes: long-term operation, high temperature environment, electrical stress, chemical corrosion, etc.
Influence: insulation performance is reduced, which can easily cause electrical short circuits and motor damage.

Overheating
Causes: poor ventilation, high ambient temperature, excessive load, poor heat dissipation, etc.
Influence: Affects the life of the motor and may cause the winding to burn.

Vibration and noise
Causes: unbalanced rotor, bearing damage, poor installation, mechanical looseness, etc.
Influence: aggravates mechanical wear, shortens the life of the motor, and may cause fault shutdown.

Bearing failure
Causes: poor lubrication, pollution, overload, expiration of bearing life, etc.
Influence: causes motor vibration, increased noise, and ultimately causes the motor to shut down.

Power supply problem
Causes: unstable voltage, poor power supply contact, unbalanced three-phase voltage, etc.
Impact: Affects the stability of motor operation, which may cause the motor to overheat or burn.

Detection and diagnosis technology
Insulation resistance test
Technical means: Use a megohmmeter to measure the insulation resistance value of the motor winding.
Application: Regularly test the insulation resistance, monitor the insulation condition, and detect insulation aging or damage early.

Infrared thermal imaging
Technical means: Use an infrared thermal imager to detect the temperature distribution on the motor surface.
Application: Detect overheated parts of the motor and identify problems such as poor heat dissipation or excessive load.

Vibration analysis
Technical means: Use a vibration analyzer to measure the vibration spectrum and vibration intensity of the motor.
Application: Monitor the vibration of the motor and identify problems such as imbalance, bearing failure, and mechanical looseness.

Bearing temperature monitoring
Technical means: Install a temperature sensor to monitor the bearing temperature.
Application: Real-time monitoring of bearing temperature changes, early warning of poor bearing lubrication or damage.

Electrical parameter monitoring
Technical means: Use an electrical parameter tester to monitor the voltage, current, power factor and other parameters of the motor.
Application: Monitor power supply stability and motor operation status, and identify problems such as voltage instability or three-phase imbalance.

Through these detection and diagnostic technologies, potential faults of high-voltage explosion-proof motors can be discovered early, preventive measures can be taken, sudden failure shutdowns can be avoided, and the safety and operating efficiency of the equipment can be improved.