With the continuous improvement of industrial automation, people's demand for frequency converters is bigger and bigger. Of course, some consumers don't know much about them. What exactly do they do? Let's take a look together with Xiaobian.
Definition：
Frequency converter is the application of frequency conversion technology and microelectronic technology to control the power control equipment of AC motor by changing the frequency mode of motor power supply.
The converter is mainly composed of rectifier (AC variable DC), filter, inverter (DC AC), brake unit, drive unit, detection unit micro processing unit and so on. Inverter by internal IGBT drive voltage and frequency off to adjust the output power, the power supply voltage required to provide according to the actual needs of the motor, so as to achieve the purpose of speed, energy saving, in addition, there are a lot of protection drive, such as over-current, over-voltage, overload protection and so on. With the continuous improvement of the degree of industrial automation, the frequency converter has also been widely used.
Functional function:
Frequency conversion energy saving
Frequency conversion can not save electricity everywhere, there are many field combined frequency conversion does not necessarily save electricity. As an electronic circuit, the converter itself also needs to consume power (about 3-5% of the rated power). A 1.5 air-conditioning power consumption is also 20-30W, the equivalent of a pilot. The operation of the transducer under high frequency, with a power saving function, is a fact. But the precondition is:
First, high power and load of fan / pump.
Second. The device itself has a power saving function (software support).
This is the three conditions that embody the power saving effect. In addition, it does not mean that it is not saving electricity, and there is no meaning. If the frequency conversion of frequency converter is energy-saving without precondition, it is exaggerated or commercial hype. When you know the original, you will use him to serve you. We must pay attention to the use of the situation and the use of the conditions to correct the application, otherwise it is blind, credulous and deceived.
Power factor compensation and energy saving
The reactive power will not only increase the heating power loss and equipment, more important is to reduce the power factor of the power grid leads to the decrease of active power, reactive power consumption in a large number of lines, low efficiency, serious waste of equipment, the use of frequency control devices, the inverter internal filter capacitor, thereby reducing the reactive power loss, increase active power grid.
Soft start energy saving
1: the hard start of the motor will cause serious impact on the power grid, and it will also require too much capacity of the power grid. The large current and vibration caused by the startup will cause great damage to the baffle and valve, which will be extremely unfavorable for the life of the equipment and pipeline. With the use of frequency conversion energy saving device, the soft starting function of converter will start the current from zero, and the maximum value will not exceed the rated current. It will reduce the impact on the power grid and the power supply capacity, and extend the service life of the equipment and valve. The maintenance cost of the equipment is saved.
2: theoretically, the inverter can be used in all mechanical equipment with electric motor, the motor starts, will be 5-6 times higher than the rated current, will not only affect the motor service life and consume more power. The system was designed in the motor selection will be left on a margin, motor speed is fixed, but in actual use, sometimes running at low or high speed, so the frequency transformation is very necessary. The factors of soft starting and compensating power of motor can be realized by frequency converter