Working principle and functional application of frequency converter

成都亿佰特

Working principle and functional application of frequency converter [Copy link]

Variable-frequency Drive (VFD) is a power control device that uses frequency conversion technology and microelectronics technology to control AC motors by changing the frequency of the motor's working power supply.

The inverter is mainly composed of rectification (AC to DC), filtering, inversion (DC to AC), braking unit, drive unit, detection unit, microprocessor unit, etc. The inverter adjusts the voltage and frequency of the output power supply by the internal IGBT switching, and provides the required power supply voltage according to the actual needs of the motor, thereby achieving the purpose of energy saving and speed regulation. In addition, the inverter has many protection functions, such as over-current, over-voltage, overload protection, etc.

The working principle of the frequency converter is to control the main circuit through the control circuit. The rectifier in the main circuit converts AC power into DC power, the DC intermediate circuit smoothes and filters the DC power, and the inverter finally converts the DC power into AC power of the required frequency and voltage. Some frequency converters will also add components such as CPU in the circuit to perform necessary torque calculations.

Frequency converter is an electrical device that converts industrial frequency power into AC power of any frequency and voltage. The main purpose of frequency converter is to adjust the power of the motor and realize the variable speed operation of the motor. The composition of frequency converter mainly includes two parts: control circuit and main circuit, in which the main circuit also includes rectifier and inverter and other components.

The power supply of the inverter is generally 50Hz or 60Hz. Whether in the home or production field, the frequency and voltage of the power supply are constant. The motor working with the power supply may cause power loss when adjusting the speed. By adjusting the inverter, the power loss of the motor can be reduced when adjusting the speed.

The inverter adjusts the voltage and frequency of the power supply to achieve the purpose of energy saving and speed regulation. In addition, the inverter has many protection functions, such as over-current, over-voltage, overload protection, etc. With the continuous improvement of industrial automation requirements and the advocacy of energy saving, the application of inverters is becoming more and more extensive.

Frequency converters are mainly used in: frequency conversion energy saving, automation systems, improving process level and product quality, and achieving motor soft starting.