Fan inverter is a device used to control the speed of the fan, its main functions include energy saving and consumption reduction, improve the running state of the fan, improve production efficiency and extend product life. The following is the specific principle:

The fan inverter adjusts the power supply frequency and voltage of the motor by changing the power supply frequency, so as to adjust the motor speed.

The fan inverter is usually composed of rectifier, filter, inverter, PWM control circuit, drive circuit and protection circuit.

The rectifier converts the AC voltage to DC voltage, the filter smooths the DC voltage, and the inverter converts the smooth DC voltage to AC voltage. The PWM control circuit then outputs these AC voltages to the motor at a specific frequency and voltage to achieve frequency conversion control of the motor.

The air volume and pressure of the fan are proportional to the speed of the motor, and the shaft power of the fan is proportional to the quadratic of the speed of the motor. Therefore, by adjusting the motor speed, the air volume and pressure of the fan can be effectively controlled without changing the opening of the damper or valve, so as to achieve the purpose of energy saving and consumption reduction. In addition, the fan inverter also provides a variety of protective measures, such as overload protection, short circuit protection, overheat protection, etc., to ensure the safe operation of the equipment.

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