In the use of various three-phase asynchronous motors, the energy loss of the motor is often encountered, but why is the energy loss of the motor increasing? How to improve the efficiency of the motor? In fact, it is not so complicated. Dalan Motor Xiaobian takes you to see where the problem lies.
The reason why the motor energy loss is getting larger and larger is the reason why the motor use efficiency is low.
First, the motor load rate is low.
Due to improper motor selection, the power calculation margin is too large or the production process changes, so that the actual working load of the motor is much smaller than the rated load, and the rated load of the motor is about 30%~40% of the installed capacity. Run down, running efficiency is too low.
Second, old and old (eliminated) type 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. With the maturity of a new generation of motor products, early generations of motor products will gradually face elimination. If the special years have expired and the parts are old and aging, if they are not replaced, they will not meet the original intention of energy saving and emission reduction, and will also affect the production results.
Third, 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 hydraulic motor generates a negative sequence torque, and the three-phase voltage of the motor is increased, and the motor generates a negative sequence torque. Increase the loss in motor operation. 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.
Fourth, 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.
The state has specified the following three operating areas for three-phase asynchronous motors: the load rate is between 70% and 100% for the economic operation area; the load rate is between 40% and 70% for the general operating area; the load rate is 40%. The following are non-economic operating areas. Improper selection of motor capacity will undoubtedly result in waste of electrical energy. Therefore, using a suitable motor to improve the power factor and load rate can reduce power loss and save power.
Many three-phase asynchronous motor users should find the reasons from the above four aspects when they encounter insufficient motor energy consumption and motor energy loss, which can greatly improve the efficiency of the motor and improve the economic efficiency of the plant.
----- Editor-in-Chief: Dalan Oil Pump Motor 02-Procurement Consultant
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