The function of the frequency converter is to turn the 50EE power supply into a continuously adjustable frequency power supply, or it can liberate the power supply from 50Hz, so that the AC induction motor has the freedom of speed. In recent years, due to the rapid development of power electronics technology, the performance of the inverter has become better and better, and the price has been lowered year by year. This provides very good conditions for the promotion of inverter applications. Because the controllable performance of the inverter is superior, the energy-saving effect is remarkable, and people's understanding of the inverter is becoming more and more clear. It is a common understanding that the inverter is used to renovate the old equipment and assemble new equipment. At present, most of the domestic market is occupied by imported machines, but the domestic inverter industry is starting to rise. How do you view the domestic and imported machines of the inverter from the perspective of the user? The domestic machine is cheap, and the imported machine has many functions. How to choose the most cost-effective? This article makes a simple comparison between the two: For advanced machines, high-pressure machines should be imported. It is more affordable for popular machine selection. There are many classification methods for frequency converters, which are divided into three categories for the convenience of description: High pressure type The input/output voltage is above 3000V, and the power of this type of machine is more than 1000KW. Therefore, it can also be called high-voltage and large-capacity type. Advanced type The machine contains flux vector control or direct torque control. It has precise control of the speed and torque of the motor, can automatically test the parameters of the motor, and has large starting torque and low noise. It can realize synchronous operation, proportional operation, PI control, closed loop speed or spindle position control, and can realize computer communication and PIC networking. Popular type It does not contain flux vector control, only V/F control, simple structure and low price. The V/F control of the popular machine can be selected from a variety of curves, such as linear, square, cubic, and combinations thereof, so it can be adapted to many occasions. The most important thing to achieve frequency conversion is the pump and fan load. According to the data, the power consumption of the pump fan type load accounts for 1/3 of the total amount used in the country. If such a load popularizes the frequency converter, the power saved is more than the total power generation after the completion of the Three Gorges Hydropower Station. It can be seen from this that it is important and urgent to use frequency conversion technology to transform such loads. It is fully competent to use the popular machine to play this role. We hope that this change will be faster, of course, this requires manufacturers to compete. There are quite a few speed control and control occasions that can be used by popular inverters. It is better to choose a domestically-made machine for popular inverters. For elevators and precision control occasions, imported machines should be selected.
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