4 aspects of motor energy performance

Update:26-01-2019
Summary:

Motor energy saving mainly through the selection of ene […]

Motor energy saving mainly through the selection of energy-saving motor, appropriate selection of motor capacity to achieve energy saving, the use of magnetic wedge to replace the original slot wedge, the use of Y / △ automatic conversion device, motor power factor reactive power compensation and winding motor liquid speed control, etc. The program is implemented.
Energy consumption is mainly in the following aspects:
1. The motor load rate is low. Due to improper motor selection, excessive margin or changes in production process, the actual working load of the motor is much smaller than the rated load. The motor that accounts for 30%~40% of the installed capacity runs at 30%~50% of the rated load. The efficiency is too low.
2. The power supply voltage is asymmetrical or the voltage is too low. Due to the unbalanced single-phase load of the three-phase four-wire low-voltage power supply system, the three-phase voltage of the motor is asymmetrical, the motor generates negative sequence torque, and the three-phase voltage of the motor is asymmetrical, and the motor generates negative sequence torque. Loss in the operation of large motors. In addition, the grid voltage is low for a long time, so that the motor current of normal operation is too large, so 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 (eliminated) motors are still in use. These motors use Class E insulation, which is bulky, has poor starting performance and low efficiency. Although it has undergone an annual transformation, there are still many places in use.
4. Poor maintenance management. Some units do not perform maintenance on the motor and equipment as required, and allow them to operate for a long period of time, resulting in increasing losses.

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