WESTINGHOUSE Three Phase Induction Motors

3. Maintenance of transmission system

Coupling maintenance: Check the tightening of coupling bolts every month, and tighten them promptly if they are loose; Check the rubber pads (flexible couplings) or elastomers of the coupling every six months, and replace them immediately if aging or cracking occurs; Re check the coaxiality of the coupling every year, and adjust if the deviation exceeds the standard.

Belt drive maintenance: Check the belt tension every week. If there is slippage or abnormal noise, adjust the center distance or replace the belt in a timely manner; Check the wear of the pulley every 3 months. If the wear depth of the groove exceeds 2mm, replace the pulley; It is prohibited to mix belts of different specifications and brands.

（3） Common troubleshooting and solutions

Common causes and troubleshooting steps for fault phenomena

Unable to start (no movement) due to power failure, broken wiring, blown fuses, tripped protectors, and rotor jamming. 1. Check the power switch and fuses, and replace them with matching fuses if they are blown; 2. Check the wiring terminals and repair broken or disconnected wires; 3. Reset the protector and investigate the cause of the trip (such as overload, short circuit); 4. Manually rotate the motor shaft. If it is stuck, check whether the coupling is stuck or the bearing is damaged. If necessary, disassemble and repair it

Immediately trip the winding for short circuit/grounding, single-phase operation, overload, and incorrect protector parameter settings after startup. 1. Use a megohmmeter to check the insulation resistance of the winding. If there is a short circuit or grounding, disassemble the motor and repair the winding; 2. Check if the three-phase power supply is missing phase and repair the broken wire; 3. Reduce the load and ensure that the load does not exceed the rated power; 4. Adjust the parameters of the protector (overload current 1.15 times rated current)

Overheating during operation (winding temperature>105 ℃), overload, ventilation blockage, environmental temperature exceeding the standard, three-phase current imbalance, winding insulation aging 1. Reduce the load to ensure that the load is within the rated range; 2. Clean the dust from the cooling fan and heat sink to ensure smooth ventilation; 3. Improve environmental heat dissipation (such as adding ventilation equipment); 4. Check the voltage of the three-phase power supply and repair the fault that caused the current imbalance; 5. Check the insulation of the winding, and replace the winding if it has aged

Insufficient lubrication due to high temperature/abnormal noise of bearings, deterioration of lubricating grease, improper installation, bearing wear, and entry of foreign objects. 1. Supplement or replace qualified lubricating grease; 2. Recheck the coaxiality of the coupling and adjust it to the allowable range; 3. Disassemble the bearing and check for wear. If the raceway or ball bearings are worn or corroded, replace the bearing; 4. Clean the bearing end cover, remove foreign objects, and replace the sealing ring

Vibration exceeding the standard (>3.8mm/s), rotor imbalance, insufficient foundation stiffness, coupling eccentricity, and uneven belt tension. 1. Perform dynamic balance correction on the rotor; 2. Strengthen the installation foundation and add shock-absorbing pads; 3. Adjust the coaxiality of the coupling and tighten the foundation bolts; 4. Adjust the belt tension and replace worn pulleys

Recycling and compliant disposal

（1） Scrap judgment criteria

The cast iron frame of the motor is severely deformed and cracked, and cannot be repaired;

The stator winding is burnt and aged, and the repair cost exceeds 50% of the price of a new motor;

The rotor guide bar is loose or broken, and the unevenness of the air gap exceeds 10%;

The bearing is severely worn, the shaft is bent and deformed, and cannot be corrected;

The motor has been in operation for over 15 years, with frequent malfunctions and high maintenance costs.

（2） Recycling and disposal process

1. Material classification and recycling

Cast iron components such as cast iron frames, end caps, and bottom plates, as well as steel components such as steel fan covers and anchor bolts, are classified and disassembled before being handed over to professional recycling institutions for recycling and reuse;

The copper wires in the stator winding should be disassembled and recycled separately to avoid mixing with other metals;

Insulation materials (such as winding insulation paper, coil binding tape), rubber sealing rings, belts and other non-metallic materials are classified as recyclable and non recyclable, and non recyclable parts are disposed of as general industrial solid waste.

2. Hazardous waste disposal

Waste lubricating grease in motor bearings and waste lubricating oil in sliding bearings are classified as hazardous waste and need to be collected in specialized sealed containers. They should be handed over to qualified hazardous waste treatment institutions for compliant disposal, and it is prohibited to discharge or dump them indiscriminately;

If the motor is a permanent magnet motor, it needs to be heated to 300 ℃ for demagnetization treatment before recycling to avoid strong magnetic fields interfering with electronic devices or causing harm to the human body.