Different Types of VFD
According to different usages, VFD can be divided into general frequency converters and specialized type frequency inverter.
General purpose VFD is used for common asynchronous motor, such as fan, water pump, ball mill, etc.
Specialized type VFD is used for some special motors, such as cranes, air compressors, PMSM motors, etc. Compared to the general type, the special type VFD has specific functions and is applicable to different devices.
What is VFD, How it works?
VFD is a kind of speed-regulating and motor-protecting drive system.
The main working principle of VFD is: through microelectronic devices, power electronic devices and control technology, the power frequency AC power supply to the motor stator through diode rectification into DC, and then by IGBT and other inverters into frequency and voltage adjustable AC power supply, this power supply and then drag the motor and load.
What Types of motors can be used with variable frequency drives?
In general, variable frequency drives are mainly used in mechanical equipment whose power is greater than or equal to the motor power, large electrical equipment such as mine mills, compressors. The inverter has a wide range of applications.
The most common motor equipment used by the frequency drive is the fan and the water pump, which can ensure a certain margin when the fan and the water pump are driven.
The frequency drive can also be used in motor equipment that needs soft start. The frequency converter has an excellent current regulation function, which can play a certain role in protecting these mechanical equipments.
The frequency drive can perform a variety of adjustment work at different frequencies. There are many kinds of mechanical equipments suitable for the use of frequency drive. The main influence of frequency drive on motors is frequency conversion and speed regulation. In addition to assisting mechanical equipment in variable speed operation in transmission machinery, frequency conversion motors can also be used for motors with excessive starting current. Combined use, adjust the excessive current in the motor, the motor starts normally, and protect the performance of the motor to a certain extent.
Application Background of VFD
The use of VFD to avoid starting the impact on the power grid, reduce the failure rate of equipment, eliminate vibration and water hammer phenomenon, prolong the service life of equipment, also reduce the capacity requirements of the power grid and reactive power loss.
