Inverter working principle
VARIABLE-FREQUENCY DRIVE, VFDs are power control devices that apply variable frequency technology and microelectronic technology to control AC motor by changing motor operating power frequency.
The inverter is mainly composed of rectifier (AC variable DC), filtering, inverter (DC change), brake unit, drive unit, detecting unit microcessing unit, and the like. The inverter adjusts the voltage and frequency of the output power supply by the interior of the internal IGBT. According to the actual needs of the motor, the power supply voltage thereof is provided, which in turn achieves energy saving, speed control, and many of the inverter there are many protection functions. Such as overcurrent, overvoltage, overload protection, etc. As industrial automation is increasing, the inverter has also been very widely used.
Function of inverter
1, frequency conversion energy saving
Inverter energy saving is mainly manifested in a fan, a pump application. In order to ensure the reliability of production, various production machinery has a certain amount of richness when designing the power driver. When the motor cannot operate under full load, excess torque increases the consumption of active power, resulting in a waste of power. Fans, pumps, etc. The traditional speed control method is to adjust the air volume and water supply by adjusting the baffle of the inlet or outlet, and the amount of water supply is high, and a large amount of energy is consumed on the baffle, the shutdown process of the valve. middle. When the frequency conversion speed is used, if the traffic requirements are reduced, the requirements can be satisfied by reducing the speed of the pump or fan.
2, power factor compensation energy saving
The reactive power is not only increasing the heating of lines and equipment, but more importantly, the reduction in power factor has caused a decrease in power grid, and a large number of reactive power consumption is low, and the equipment is low, and the waste is severe. After the inner filter capacitance of the inverter, the power loss of the grid is increased.
Changchun Hongbao is an export-oriented enterprise specializing in research, development, production, sales and technical services in power field products.
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