Inverter is known by everyone. It is more and more essential in our life and work. What are the advantages of frequency converter?
Variable frequency speed control has been recognized as one of the most ideal speed, the most promising, the general inverter constitute the main purpose of the variable speed drive system, one is to meet the increasing labor productivity, improve product quality, improve the degree of automation equipment, Ti Gaosheng quality of life and improve the living environment requirements; two is to save energy and reduce production cost. Users choose different types of frequency converters according to their actual technical requirements and applications.
Frequency converter
The correct choice of general inverter to drive control system can normal operation is very important, we must first clear the use of general inverter, according to the type of production machinery, speed range, response speed and control precision, starting torque requirements, to fully understand the load characteristics of the driver inverter, general inverter using what constitutes the control function the system decides the choice of control, and then decide the most appropriate way. The universal frequency converter should be used not only to meet the requirements of production technology, but also to be reasonable in technical and economic indicators. If the selection of general inverter, system design and improper use, often make the same frequency converter can not operate properly, fail to achieve the expected goal, and even cause equipment failure, resulting in unnecessary losses. In addition, in order to ensure the long-term and reliable operation of the general frequency converter, the connection of the ground wire of the frequency converter is also very important.
1. Function and use of frequency converter
The adjustable speed drive of the frequency converter and the AC motor is called the frequency converter drive, and its function is used as follows. It may be related to each other. In fact, there is no clear classification. See the table below for reference only.
2. Advantages of using frequency converter
(1) energy saving of variable frequency speed regulation
The use of frequency control, the most obvious energy-saving effect of fan and water pump, energy saving rate can reach 20% to 60%, this is because the three party power consumption and speed of fan pump is proportional to the average flow rate, when the user needs is small, fan, pump speed is low, the energy saving effect it is very considerable. While traditional baffles and gates are used to adjust the flow rate, the power consumption varies greatly. Because of this kind of load, about 20% to 30% of the total capacity of AC motor, their energy saving is very important.
For some constant torque loads at low speed, such as conveyor belt, and so on, the variable frequency speed control can also be saved. In addition, the original speed larger energy consumption (such as wound rotor motor speed, etc.) the original complex, are less efficient (such as door, planer etc.) by frequency conversion, energy saving effect is obvious.
(2) advantages of variable frequency speed regulation in motor operation
The frequency conversion speed regulation is easy to realize the positive and reverse of the motor. Only by changing the switching order of the inverter's internal inverter tube, the output commutation can be realized, and there is no problem of burning the motor because of the improper commutation.
The starting of frequency conversion system mostly starts from low speed and has low frequency. The time of adding and decelerating can be set arbitrarily, so the time of adding and decelerating is relatively slow and the starting current is small, so it can be carried out at a higher frequency.
When the VVVF system is braking, the inverter can use its own braking loop to consume the energy of the mechanical load on the brake resistor, or to return to the power supply network, but the feedback to the power grid needs to increase the special accessories, and the investment is large. Besides, the frequency converter also has the DC braking function. When the brake is needed, the converter adds a DC voltage to the motor, so that no brake control circuit is needed.
(3) application for the purpose of improving the technological level and the quality of the products
In addition to applications on fans and pump loads, frequency conversion can also be widely applied in various control fields of machinery and equipment, such as transmission, winding, lifting, extruding, machine tools and so on. It can increase the rate of peculiar finished products, extend the normal working life and service life of the equipment, simplify operation and control system, and even alter the old process specifications, so as to improve the control level of the whole equipment.