How does VFD / VSD pump inverter save energy?

Most motors are designed to rotate at a set speed based on the number of magnetic poles built into them and the supply voltage and frequency applied. They cannot alter their speed. Even for fixed speed systems, it can be difficult to find a motor that rotates at the correct speed for its designated application. Therefore, variable frequency drives (VFD) / variable speed drives (VSD) Constant Pressure Booster Pump Inverter are often required.

Variable frequency drives (VFD) / variable speed drives (VSD) Constant Pressure Booster Pump Inverter provide effective speed control of AC motors by manipulating voltage and frequency. Controlling the speed of a motor provides users with improved process control, reduced wear on machines, increased power factor, and large energy savings.

Variable torque load applications like water pumps have torque requirements that increase in proportion to the square of the speed and reach 100% torque just below rated speed

The most significant energy savings can be achieved in applications with a variable torque load. The cube law relationship between speed and power means that reducing a pump’s speed in a variable torque load application by 20% can achieve energy savings of 50%. Therefore, for most motion control applications, reducing motor speed is often the easiest way to get large energy savings.

Reference Source:

https://acim.nidec.com/drives/control-techniques/downloads/how-drives-save-energy

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