Imported Frequency Converters and Domestic Frequency Converters Comparative Analysis
The function of the inverter is to turn the 50EE power supply into a continuously variable frequency power supply or to free up the power supply from 50Hz so that the AC induction motor is free and fast.
In recent years due to the rapid development of power electronics technology, the performance of the inverter getting better and better, but the price is reduced every year. This is to promote the application of the inverter provides a very good condition. As the inverter controllable performance, energy-saving effect is remarkable, coupled with people's understanding of the inverter more and more clear, with the inverter to transform the old equipment, new equipment assembly has become our consensus.
Most of the current domestic market is dominated by imported machines, but domestic inverter industry is rising. From the user's point of view how to treat the inverter's domestic machine and imported machine? Domestic machine cheaper, more imported machine function, how to choose the most cost-effective? This article makes a simple comparison of the two:
For advanced machines, high-pressure machine should choose imported machine. For the popular machine-made domestic machine more affordable. The classification of the inverter a lot, which is described for the convenience of rough divided into three categories:
High-pressure type
Input / output voltage is above 3000V, the power of this kind of model is also more than 1000KW, so it can also be called high-pressure high-capacity type.
Advanced
The machine contains magnetic flux vector control or torque direct control. On the motor speed and torque with precise control, can automatically test the motor parameters, starting torque, noise. Can achieve synchronous operation, proportional operation, PI control, closed-loop speed or spindle position control, enabling computer communications and PIC networking and more.
Popular type
Without flux vector control, only V / F control, simple structure, low price.
Universal machine V / F control a variety of curves to choose from, such as linear, square, cubic and their combination, so can adapt to many occasions.
The most should be realized quickly is the pump, fan load. Data have been introduced, water pump fan load electricity consumption of the total amount is 1/3. If this type of load universal inverter, saving more than the Three Gorges Hydropower Station after the completion of the total generating capacity even more. It can be seen from the use of frequency conversion technology to transform such a load is how important and urgent. It is perfectly qualified to play this role with a universal machine.
We look forward to this transition faster, of course, this requires manufacturers to be furious. A considerable number of speed control and control occasions available universal inverter to bear. Universal inverter selected domestic machine better. Elevator, precision control occasions should choose imported machines.
Our Telecommunication Tower are made from quality sheet through bending, forming, automatic welding and hot galvanization. We can reach one-run machining length of 14m and can bend sheet of thickness up to 45mm. We adopt advanced welding procedures, automatically weld main joints and reach rank-II welding quality.
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