In the use of a variety of three-phase asynchronous motors often encounter the phenomenon of increasing energy loss of the motor and so on, but why the motor energy loss is increasing? How to improve the use efficiency of the motor? In fact, not so complicated, Dalan Motor Xiaobian take you to see where the problem lies?
The reason why the motor's energy consumption is getting bigger and bigger is the reason why the motor's use efficiency is low. There are mainly the following aspects:
First, the motor load rate is low.
Due to improper motor selection, excessive power calculation margin or production process changes, the actual working load of the motor is far less than the rated load, and the rated load of 30%~50% of the motor is about 30%~40% of the installed capacity. Under the operation, the operating efficiency is too low.
Second, old, old (eliminated) type of motor is still in use.
These motors have E-class insulation, large size, poor start-up performance, and low efficiency. Although it has undergone an annual transformation, there are still many places in use. As the new generation of motor products matures, early generations of motor products will gradually be phased out. As the special years have expired, parts and components that are already aging will not only fail to meet the original intention of saving energy and reducing emissions, but also affect the production results.
Third, the power supply voltage asymmetry or 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, the negative torque of the hydraulic motor is generated, the asymmetry of the three-phase voltage of the motor is increased, and the negative sequence torque of the motor is generated. Increase the loss during motor operation. In addition, the grid voltage is low for a long time, which makes the normal working motor current large, and therefore the loss increases. The greater the three-phase voltage asymmetry, the lower the voltage, the greater the loss.
Fourth, poor maintenance and management.
Some units do not perform maintenance on the motor and equipment as required, allowing them to continue to operate for longer periods of time, resulting in increased losses.
The country has specified the following three operating areas for three-phase asynchronous motors: the load rate is between 70% and 100% for the economic operating area; the load rate is between 40% and 70% for the general operating area; and the load rate is 40%. The following are non-economic operating areas. Improper selection of motor capacity will undoubtedly cause a waste of electrical energy. Therefore, using a suitable motor to increase power factor and load ratio can reduce power consumption and save power.
Many enterprises that use three-phase asynchronous motors have problems with the above four aspects when they encounter insufficient motor energy usage and increasingly large motor energy losses, which can greatly increase the efficiency of motor use and thus increase the economic efficiency of the plant.
----- Editor: Dalan Oil Pump Motor 02 - Procurement Consultant
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