Variable frequency drive (VFD) is the application of frequency conversion technology and microelectronics technology to control the AC motor power control equipment by changing the frequency of the motor power supply. The inverter is mainly composed of rectification (AC to DC), filtering, inverter (DC to AC), brake unit, drive unit, and detection unit micro-processing unit. The inverter adjusts the voltage and frequency of the output power supply by breaking the internal IGBT, and provides the required power supply voltage according to the actual needs of the motor, thereby achieving the purpose of energy saving and speed control. In addition, the inverter has many protection functions. , such as over-current, over-voltage, overload protection and so on. With the continuous improvement of industrial automation, inverters have also been widely used.
The basic structure of the frequency converter:
The frequency converter is a device that converts the power frequency power supply (50Hz or 60Hz) into various frequency AC power sources to realize the variable speed operation of the motor, wherein the control circuit completes the control of the main circuit, and the rectifier circuit converts the alternating current into direct current, and the middle of the direct current. The circuit smoothes the output of the rectifier circuit, and the inverter circuit converts the DC power back into AC power. For inverters such as vector control inverters that require large amounts of computation, sometimes a CPU for torque calculations and some corresponding circuits are needed.
Frequency changer classification:
There are many classification methods of frequency converters. According to the classification of main circuit work methods, they can be divided into voltage-type inverters and current-type inverters; according to the classification of switching methods, they can be divided into PAM-controlled inverters, PWM-controlled inverters and high carrier frequencies. PWM control inverter; classified according to the principle of work, can be divided into V / f control inverter, slip frequency control inverter and vector control inverter; according to the use of classification, can be divided into general-purpose inverter, high-performance special inverter, High-frequency inverters, single-phase inverters and three-phase inverters.
Customized First Punch Die,Punch Die Forging Die for Bolt,First Punch Die for Screw,First Punch Die
Chongqing Henghui Precision Mold Co., Ltd , https://www.citool.com