For users, the most concern is the purpose of the inverter. According to different purposes, the frequency converter can be divided into general frequency converter and special frequency converter.
1. General purpose inverter
Universal frequency converter is the most widely used and the largest in the frequency converter family. As the name implies, the general purpose inverter is characterized by its versatility. With the development of frequency conversion technology and the continuous expansion of market demand, general-purpose inverters are developing in two directions: one is a low-cost simple general-purpose inverter that simplifies some system functions for the main purpose of energy saving. It is mainly used in Water pumps, fans, blowers and other occasions that do not require high system speed regulation performance, and have the advantages of small size and low price; second, the design process fully considers the high performance, multi-function and general purpose of the application When the inverter is in use, the user can select an algorithm to set various parameters of the inverter according to the characteristics of the load, or select various spare options provided by the manufacturer to meet the special needs of the system according to the needs of the system. In addition to all applications of simple inverters, high-performance multifunctional general-purpose inverters can also be widely used in elevators, CNC machine tools, electric vehicles and other occasions that have high requirements for the performance of the speed control system. In the past, general-purpose inverters basically adopted the U/f control mode with a relatively simple circuit structure. Compared with the VC mode, the torque control performance was worse. However, with the development of frequency conversion technology, some manufacturers have introduced general-purpose frequency converters using VC to meet the needs of the increasingly competitive frequency converter market. This kind of multifunctional general frequency converter can be switched to U/f control operation or VC operation mode according to user needs, but the price is the same as that of U/f mode general frequency converter. Therefore, with the development of power electronic technology and computer technology, the cost performance of frequency converters will continue to increase in the future.