With the deepening of factory automation, the high efficiency and low cost of active warehouses, elevators, transfer systems, etc., as well as the high speed, high efficiency and high precision of small CNC machine tools, kneading and forming machines, textile and film machinery, etc.
Multi-function inverters need to meet the following two conditions:
First, regardless of the type of machinery, it can be driven by constant torque load, and even if the load is greatly shaken, it can ensure continuous operation. If the above conditions are not satisfied, the inverter will be easy to stop, difficult to start again, and weak to overload. In order to meet the above conditions, the inverter itself must have a current control function. For example, it is equipped with the function of instantaneous power failure countermeasures and electronic thermal relays to ensure the reliability of work, the self-seeking function necessary for continuous switching from the power grid power supply, and the torque compensation (enhancement) function and stall avoidance function for large load fluctuations. These functions must be based on current manipulation.
Second, the inverter itself should be easy to get used to and match with machinery. In addition to the softwareization of the driving technology, which is widely used in production machinery, it is also important to have optional functions that can be easily adapted to the characteristics of the machine, and input functions to transmit information between the system and the inverter.
Simple general-purpose inverter is a kind of general-purpose inverter that simplifies some system functions with the primary purpose of energy saving. It is mainly used in water pumps, fans, blowers and other occasions where the speed regulation performance of the system is not high, and has the advantages of small size and low price.
In the planning process of high-performance general-purpose inverters, the various requirements that may arise in the inverter application are fully considered, and the system software and hardware are prepared to meet these requirements. When in use, the user can select the algorithm according to the load characteristics and set the various parameters of the inverter, and can also select various spare options provided by the manufacturer according to the needs of the system to meet the special needs of the system.
In addition to being able to be used in all the application fields of simple inverters, high-performance multi-function inverters are also widely used in elevators, CNC machine tools, electric vehicles and other occasions with high requirements for the performance of the speed regulation system. In the past, the general inverter basically used the VVVF control method with a relatively simple circuit structure, which was inferior in torque control performance compared with the vc method. However, with the development of inverter technology, some manufacturers have now launched the choice of VC general-purpose inverter to get used to the increasingly competitive inverter market demand.
This multi-functional universal inverter can be switched to "VVVF operation" or "vc operation" depending on the user's needs, but the price is equal to that of the universal inverter of the VVVF method. Therefore, it is believed that with the development of power electronics and computing technology, the performance-to-price ratio of frequency converters will continue to increase in the future.
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