Where does the motor consume most of its energy? Six solutions for motor energy saving-Xinda Motor- electric motors and EV accessories supplier|INDEX--

Where does the motor consume most of its energy? Six solutions for motor energy saving

Date：2024-08-15　　　Author：XINDA MOTOR

Motor energy saving is achieved mainly by selecting energy-saving motors, appropriately selecting motor capacity, and using magnetic slot wedges.Replace the original slot wedge, adopt Y/△ automatic conversion device, the power factor of the motor. It can be realized by six solutions including reactive power compensation and liquid speed regulation of winding-rotor motors.

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

1. Low motor load rate
Due to improper motor selection, excessive margin or changes in production process, the actual working load of the motor is much less than the rated load. Motors that account for about 30% to 40% of the installed capacity operate at 30% to 50% of the rated load, and the operating efficiency is too low.

2. The power supply voltage is asymmetric or the voltage is too low
due to the three-phase four-wire systemThe imbalance of single-phase load in low-voltage power supply system makes the three-phase voltage of the motor asymmetric, and the motor generates negative sequence torque, which increases the loss in motor operation. In addition, the long-term low voltage of the power grid makes the current of the motor in normal operation larger, thus increasing the loss. The greater the asymmetry of the three-phase voltage and the lower the voltage, the greater the loss.

3. Old and obsolete (obsolete) motors are still in use.
These motors use E-type insulation, are large in size, have poor starting performance and low efficiency. Although they have undergone years of transformation, they are still in use in many places.

4. Poor maintenance management:
Some units fail to perform maintenance on motors and equipment as required, allowing them to run for a long time, resulting in increasing losses.

Therefore, it is worth studying what kind of energy-saving solution to choose based on these energy consumption performances.

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Six energy-saving solutions for motors

1. Use energy-saving motors and high-efficiency motors to reduce various losses

Compared with ordinary motors, high-efficiency motors have optimized overall design, selected high-quality copper windings and silicon steel sheets, reduced various losses, and reduced losses by 20%~30%, and increased efficiency by 2%~7%; the investment recovery period is generally 1~2 years, and some are several months. In comparison, the efficiency of high-efficiency motors is 0.413% higher than that of J02 series motors. Therefore, it is imperative to replace old motors with high-efficiency motors.

2. Choose a motor with appropriate motor capacity

Proper selection of motor capacity to achieve energy saving for three-phase asynchronous motorsThe following provisions are made for the three operating areas: the load rate between 70% and 100% is the economic operating area; the load rate between 40% and 70% is the general operating area; the load rate below 40% is the non-economic operating area. Improper selection of motor capacity will undoubtedly cause waste of electric energy. Therefore, using a suitable motor to improve the power factor and load rate can reduce power loss and save electric energy.

3. Use magnetic slot wedges to reduce no-load iron loss

The magnetic slot wedge is used to replace the original slot wedge. The magnetic slot wedge mainly reduces the no-load iron loss in the asynchronous motor. The no-load additional iron loss is generated in the stator and rotor cores by the harmonic magnetic flux caused by the slot effect in the motor. The high-frequency additional iron loss induced in the stator and rotor cores is called pulsation loss.

In addition, the stator and rotor teeth are sometimes aligned and sometimes staggered, and the magnetic flux of the tooth surface and tooth cluster changes, which can induce eddy currents in the tooth surface line layer and produce surface losses. Pulsation loss and surface loss are collectively called high-frequency additional losses, which account for 70%~90% of the stray loss of the motor. The other 10%~30% is called load additional loss, which is generated by leakage flux. Although the use of magnetic slot wedges will reduce the starting torque by 10%~20%, the iron loss of the motor using magnetic slot wedges can be reduced by 60k compared with the motor using ordinary slot wedges, and it is very suitable for the modification of motors with no-load or light-load starting.

4. Use Y/△ automatic conversion device to solve the problem of power waste

The Y/△ automatic conversion device is used to solve the problem of wasting electric energy when the equipment is lightly loaded. Without replacing the motor, the Y/△ automatic conversion device can be used to save electricity. Because in the three-phase AC power grid, the voltage obtained by different load connection methods is different, and thus the energy absorbed from the power grid is also different.

5. Reactive power compensation of motor power factor reduces power loss

The main purpose of reactive power compensation is to improve the power factor and reduce power loss. The power factor is equal to the ratio of active power to apparent power. Usually, a low power factor will cause excessive current. For a given load, when the supply voltage is constant, the lower the power factor, the greater the current. Therefore, the power factor should be as high as possible to save energy.

6. Liquid speed regulation of wound-rotor motors Liquid resistance speed regulation technology achieves speed regulation-free

Liquid speed regulation of wound-rotor motors Liquid resistance speed regulation technology is developed on the basis of traditional liquid resistance starters. The purpose of non-speed regulation is still achieved by changing the plate spacing to adjust the size of the resistance. This makes it have good starting performance at the same time. It is powered on for a long time, which brings about the problem of heating and temperature rise. Due to the use of a special structure and a reasonable heat exchange system, its operating temperature is limited to a reasonable temperature. Liquid resistance speed regulation technology for wound-rotor motors has been rapidly promoted due to its reliable operation, convenient installation, large energy saving, easy maintenance and low investment. For some wound-rotor motors that do not require high speed regulation accuracy, wide speed regulation range, and do not frequently regulate speed, such as large and medium-sized wound-rotor asynchronous motors in equipment such as fans and water pumps, the effect of liquid speed regulation is remarkable.

Where does the motor consume most of its energy? Six solutions for motor energy saving

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