Common faults and maintenance methods of three-phase asynchronous motor

In the daily operation of sewage treatment plants, the stable operation of three-phase asynchronous motors is very important. However, due to the complex environment and aging of equipment, motor failures occur from time to time. With rich maintenance experience and advanced technology, Zhaoyang Group summarizes the abnormal sound and vibration problems that may occur when the motor is running, and provides the corresponding maintenance methods. This article will detail the causes of these common failures and their solutions to help mechanical and electrical maintenance personnel quickly identify and solve these problems.

Due to the complex environment of the sewage treatment plant, the three-phase asynchronous motor is often affected by water intake, short circuit, aging, corrosion of various chemicals and misoperation, which will cause a variety of failures. If there is no clear wiring diagram, maintenance will be difficult, and sometimes it will be impossible to start. At the same time, careless operation may also cause secondary damage to the motor, and even cause electric shock accidents.

1, the motor running sound is not normal, there is abnormal noise

Fault cause

① Rotor and stator insulation paper or slot wedge rub;

② Bearing wear or oil sand and other foreign bodies;

③ the rotor core is loose;

④ bearing oil shortage;

⑤ Air duct packing or fan wipe hood;

⑥ The rotor core rub;

⑦ The power supply voltage is too high or unbalanced;

⑧ The stator windings are misconnected or short-circuited.

Troubleshooting

① Trim the insulation and cut the slot wedge;

② Replace bearings or clean bearings;

③ Repair and repair the rotor core;

④ Come on;

⑤ Clean the air duct; Reinstall;

⑥ Eliminate scratches, small rotor in the car if necessary;

⑦ Check and adjust the power supply voltage;

⑧ Eliminate stator winding faults.

Fault cause

① bearing clearance is too large due to wear;

② Uneven air gap;

③ rotor unbalance;

④ the rotating shaft is bent;

⑤ The core is deformed or loose;

⑥ The coupling (pulley) center is not balanced;

⑦Fan imbalance;

⑧ The housing or foundation strength is not enough;

⑨ Motor anchor screws loose;

⑩ Cage rotor welding break; The winding rotor is open; The stator winding is faulty.

Troubleshooting

① Repair bearings and replace them if necessary;

② Adjust the air gap to make it uniform;

③ Correct rotor dynamic balance;

④ Straighten the rotating shaft;

⑤ Correcting overlapping core;

⑥ Recalibrate to make it conform to the regulations;

⑦ Repair the fan, correct the balance, correct its geometry;

⑧ Reinforcement;

⑨ Tighten the anchor screws;

⑩ Repair the rotor winding; Repair the stator winding.

Through the detailed introduction of this article, we hope to help mechanical and electrical maintenance personnel to deal with the abnormal sound and vibration of the motor more effectively. Zhaoyang Group has been committed to improving motor performance and reliability through continuous technological innovation and optimization services. We believe that through these practical maintenance methods, we can significantly improve the efficiency and safety of equipment operation in sewage treatment plants. In the future, we will continue to work hard to provide customers with more comprehensive and efficient technical support.