The air compressor drive motor is the "power core" of the air compressor. Its operating status directly affects the stability and service life of the entire equipment. Once the motor fails, it will not only cause production interruption, but also may cause high repair costs. Scientific and reasonable maintenance is the key to ensuring the efficient operation of the motor. The following is a detailed explanation of the maintenance points from multiple dimensions.
1.1. Temperature monitoring: The motor will generate heat during operation. During normal operation, its shell temperature is generally 20-40℃ higher than the ambient temperature. You can use an infrared thermometer to regularly measure the surface temperature of the motor. If the temperature exceeds the rated value (such as the motor with insulation grade B, the limit temperature is 130℃), it may be overloaded, poor heat dissipation or winding failure, and you need to stop the machine immediately for investigation.
1.2. Vibration detection: Abnormal vibration is an important signal of motor failure. Check the vibration of the motor by hand or vibration detector. If the vibration is found to be aggravated, it may be caused by loose motor installation, bearing wear, rotor imbalance, etc., which requires timely adjustment or maintenance.
1.3. Sound monitoring: The sound of a normally operating motor is stable and regular. If there is harsh, friction or abnormal noise, it may be due to lack of oil in the bearing, friction between the stator and rotor, or damage to the fan, which requires further disassembly and inspection.
2.1. Grease selection: Choose the right grease according to the working environment, speed and load of the motor. Generally speaking, high-speed and light-load motors are suitable for low-viscosity grease, while low-speed and heavy-load motors require high-viscosity and extreme pressure resistant grease.
2.2. Regular grease replenishment and replacement: After the motor has been running for a period of time, the grease will gradually consume or age, and it needs to be replenished or replaced regularly. The grease replenishment cycle depends on the frequency of use and working conditions of the motor. Generally, it is replenished every 1000-2000 hours of operation and completely replaced every 1-2 years. When replenishing grease, pay attention to the appropriate amount to avoid excessive grease causing poor heat dissipation of the motor.
3.1. Insulation detection: The deterioration of motor insulation performance can lead to leakage or even short circuit accidents. Use an insulation resistance meter (megohmmeter) to regularly detect the insulation resistance of the motor winding to the ground and between phases. The insulation resistance should not be less than 0.5 megohms at room temperature. If the resistance value is too low, the motor needs to be dried or the winding needs to be checked for moisture or damage.
3.2. Wiring check: Check whether the motor terminals are loose or oxidized, and whether the cables are damaged. Loose wiring will increase the contact resistance, cause heating or even burn the terminals; damaged cables have the risk of leakage. After discovering the problem, it is necessary to tighten the terminals and replace the cables in time, and take protective measures.
4.1. Dust and moisture prevention: The motor should be installed in a dry and clean environment. If the working environment is dusty, the dust on the motor surface and heat sink should be cleaned regularly to prevent dust accumulation from affecting heat dissipation; if the ambient humidity is high, a dehumidifier can be installed near the motor to prevent the motor insulation from getting damp.
4.2. Ventilation and heat dissipation: Ensure that there is enough ventilation space around the motor to avoid stacking debris above the motor. For enclosed motors, it is necessary to regularly check whether the cooling fan is operating normally and whether the air cooling channel is unobstructed; for water-cooled motors, it is necessary to check whether the cooling water flow and water quality meet the requirements.
5.1. Seasonal maintenance: In the hot summer season, it is necessary to strengthen the temperature monitoring of the motor and appropriately increase the frequency of grease inspection; in cold winter areas, if the motor is shut down for a long time, warming measures must be taken to prevent the lubricating oil from solidifying and the winding from freezing and cracking.
5.2. Long-term outage maintenance: When the motor is out of use for a long time, the power supply should be disconnected, the motor should be thoroughly cleaned, anti-rust oil should be applied to protect the metal parts, and no-load operation should be performed once a month to prevent bearings, rotors and other parts from rusting and getting stuck.
To do a good job of maintaining the air compressor drive motor, it is necessary to implement measures such as daily inspections, lubrication maintenance, and electrical inspections. Through systematic and standardized maintenance, not only can the service life of the motor be effectively extended, but also the equipment failure rate can be reduced, saving operating costs for the enterprise and ensuring the continuity and stability of production.