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Explosion-proof Permanent magnet axial flow pump, with a variety of automatic functions, belongs to a new generation of DC frequency conversion technology electric pump. Electric pump small size and light weight, 5000 RPM/time can reach the same specification of asynchronous motor power 4-5 times, 3000 RPM/time, can be more than twice the power of the same specification of asynchronous motor. The efficiency is more than 90, reaching the national secondary energy consumption standards.
1, low loss, low temperature rise
Because the magnetic field of the electric pump is generated by the permanent magnet, the excitation loss caused by the excitation current to generate the magnetic field is avoided, that is, the copper loss; The rotor runs without current, significantly reducing the temperature rise of the motor, and the temperature rise is more than 20K lower under the same load.
2, high power factor
The power factor of the electric pump is high, and is independent of the motor series, the power factor of the motor is close to 1 when the motor is full load, so that compared with the asynchronous motor, the motor current is smaller, and the stator copper consumption of the motor is correspondingly smaller and the efficiency is higher. With the increase of motor series, the power factor of asynchronous motor is lower and lower. Moreover, because of the high power factor of the permanent magnet synchronous motor, the power supply (transformer) capacity of the motor can theoretically be reduced, and the supporting switchgear and cable specifications can be reduced.
3, high efficiency
Compared with the asynchronous motor, the efficiency value of the electric pump in light load is much higher, its efficient operation range is wide, the efficiency is greater than 90% in the range of 25% ~ 120%, and the rated efficiency of the permanent magnet synchronous motor can reach the current national standard level 1 energy efficiency requirements, which is its biggest advantage compared with the asynchronous motor in energy saving. In actual operation, the motor rarely runs at full power when driving the load. The reason is: on the one hand, the designer in the motor selection, is generally based on the load limit condition to determine the motor power, and the limit condition of the opportunity is very few, at the same time, in order to prevent the abnormal condition of the motor burning, the design will further to the motor power margin; On the other hand, in order to ensure the reliability of the motor, the motor manufacturer usually leaves a certain power margin on the basis of the power required by the user.
4. Other advantages
The electric pump also has the advantages of high starting torque, short starting time and high overload capacity, which can reduce the installed capacity of the equipment drive motor according to the actual shaft power, saving energy and reducing the investment in fixed assets. The permanent magnet synchronous motor is easy to control, the speed is constant, does not change with the fluctuation of the load and the fluctuation of the voltage, and only depends on the frequency, and the operation is stable and reliable. Because the speed is strictly synchronized, the dynamic response performance is good, suitable for frequency conversion control.
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