I have always heard people say that inverters can save power, but I have never understood why inverters can save power, how much they can save, and whether they save more at high frequencies or at low frequencies?
The inverter achieves energy saving by reducing voltage at light loads. Since the speed of the drag torque load does not change much, even if the voltage is reduced, it will not be much, so the energy saving is very weak.
But it is different when used in environments such as fans and water pumps. When the demand is small, the motor will reduce the speed. We know that energy consumption is proportional to the power of the rotation speed, so the torque of the motor will drop sharply, and the energy saving effect is obvious.
Of course, if the environment requires speed regulation, the energy-saving effect of the inverter is still relatively obvious. When the speed is not adjusted, the inverter will not save power and can only improve the power factor.
Frequency converter principle
The principle of frequency converter is to apply the principle of frequency conversion technology and microelectronics technology to control the power control equipment of AC motor by changing the frequency of the motor's operating power supply. The power supply used is divided into AC power supply and DC power supply. The general DC power supply is mostly obtained by transforming the AC power supply through a transformer and rectifying and filtering it. AC power accounts for about 95% of the total power used by people.
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