Jan 23, 2021
Application production of general inverter
General-purpose inverters have been widely used in industries such as water supply and sewage treatment. Since frequency converters are mainly used in fans and water pumps in the water industry, the water delivery system of water pumps in the water industry does not require high speed regulation accuracy, control requirements, and speed regulation ranges. , The general-purpose inverter used for pump speed regulation does not require high-end products. However, compared to other substation and distribution equipment, the inverter has a complex structure, a higher failure rate, and high maintenance technical requirements. However, water industry enterprises have fewer maintenance personnel for power and electronic products, but cities have higher requirements for water supply reliability. Therefore, this puts high demands on the quality of the inverter and the improved service of the supplier.
In industrial production, living, agricultural water-saving irrigation projects and other water production, the application of water supply general frequency converter can be quickly assembled into a constant pressure water supply system. When the water supply automatic control system is working, the equipment detects the pressure change of the water supply pipe network when the water volume changes through the high-sensitivity pressure sensor on the pipe network, and continuously transmits the changed signal to the frequency converter, which is judged by the microcomputer and compared with the set pressure After that, it sends an instruction to change the frequency to the controller. The controller changes the speed of the pump motor and the number of active units by changing the frequency, automatically adjusts the peak and valley water consumption, and ensures the constant pressure of the water supply network to meet the user's water demand.
The basic structure of the inverter
The frequency converter is composed of main circuit (including rectifier, intermediate direct link, inverter) and control circuit.
At present, the development trend of general frequency converters for machine tools is as follows:
1 High performance. At present, basically all inverters require vector control methods, and a small number of different levels of control structures and algorithms have appeared. It is worth noting that the speed sensorless vector control (SVC) has been developed rapidly in recent years. Because SVC can require a low-interest, high-function disposal plan, it has become the dream specification and development direction in general inverters.
2 The ease of mastery continues to improve. The user's demand for the inverter is gradually transformed into a field device, and a setting tool is added to the software, in order to simplify the debugging process through user operation.
3 The demand for functional modularity and intelligence is gradually increasing.