Motor energy saving is mainly achieved by selecting energy-saving motors, appropriately selecting motor capacity to achieve energy saving, using magnetic slot wedge instead of original slot wedge, using automatic conversion device, motor power factor and reactive power compensation, and winding motor liquid speed control.

The energy consumption of the motor is mainly in the following aspects:

1. Low motor load rate

Due to improper selection of motors, excessive surplus or changes in production technology, the actual working load of the motor is much smaller than the rated load. The motor, which accounts for about 30% to 40% of the installed capacity, runs under 30% to 50% of the rated load. The efficiency is too low.

2. The power supply voltage is not symmetrical or the voltage is too low

Due to the unbalance of the single-phase load of the three-phase four-wire low-voltage power supply system, the three-phase voltage of the motor is asymmetric, and the motor generates negative sequence torque, which increases the asymmetry of the three-phase voltage of the motor, and the motor generates negative sequence torque, increasing losses in the operation of large motors. In addition, the long-term low voltage of the power grid makes the current of the normal working motor larger and the loss increases. The greater the asymmetry of the three-phase voltage and the lower the voltage, the greater the loss.

3. Old and old (obsolete) motors are still in use

These motors use E edge, are large in size, have poor starting performance and low efficiency. Although it has undergone years of renovation, it is still in use in many places.

4. Poor maintenance management

Some units did not maintain the motors and equipment in accordance with the requirements and left them in long-term operation, resulting in increasing losses.

Reported by Jessica