Routine maintenance of electric motors is crucial for reducing and avoiding motor malfunctions during operation. The most important step is to conduct inspections and promptly eliminate any root causes of abnormal phenomena. After an accident occurs, conducting accident analysis carefully and taking countermeasures is an essential technical task to reduce the number of accidents and improve the efficiency of motor operation when repairing and stopping the machine. Routine maintenance of electric motors is certainly very important for their normal operation, However, motors in operation often encounter many unexpected situations, such as short circuits, overloads, and interruptions. In order to prevent the motor from being damaged under these conditions, some operational protection measures must be taken.

In order to ensure the normal operation of the motor, in addition to using it according to the operating procedures and paying attention to normal monitoring and maintenance during operation, regular inspections should also be carried out to do a good job in motor maintenance and upkeep. This can eliminate some problems in a timely manner, prevent faults from occurring, and ensure the safe and reliable operation of the motor. The interval of regular maintenance can be determined by considering the usage environment based on the form of motor maintenance.

Energy saving solutions for motors:

One is the low load rate of the motor. Due to improper selection of motors, excessive margin, or changes in production processes, the actual working load of the motor is much lower than the rated load. Approximately 30% to 40% of the installed capacity of the motor operates at 30% to 50% of the rated load, resulting in low operating efficiency.

The second is that the power supply voltage is asymmetric or too low. Due to the imbalance of single-phase load in the three-phase four wire low-voltage power supply system, the three-phase voltage of the motor is asymmetric, resulting in negative sequence torque and increasing the three-phase voltage asymmetry of the motor. The motor generates negative sequence torque, which increases the losses during motor operation. In addition, the long-term low voltage of the power grid leads to a higher current of the normally operating motor, resulting in increased losses. The greater the asymmetry of the three-phase voltage, the lower the voltage, and the greater the losses.

The third is that old and outdated (obsolete) motors are still in use. These motors adopt E-class insulation, have a large volume, poor starting performance, and low efficiency. Despite years of renovation, there are still many places in use.

Fourth, poor maintenance management. Some units do not maintain and repair motors and equipment as required, allowing them to operate for a long time, resulting in increasing losses.

Therefore, it is worth studying which energy-saving scheme to choose based on these energy consumption performances.

There are roughly seven energy-saving schemes for motors. Experts analyzed one by one and said that energy-saving motors should be selected. Compared with ordinary motors, high-efficiency motors have optimized their overall design by selecting high-quality copper windings and silicon steel sheets, reducing various losses by 20% -30%, and improving efficiency by 2% -7%; The investment payback period is generally 1-2 years, sometimes several months. Compared to J02 series motors, high-efficiency motors have an efficiency improvement of 0.413%. Therefore, it is imperative to replace old motors with high-efficiency motors.