Inverter variable speed drive energy saving

A variable speed drive regulates the speed of the motor, and in turn the speed of the pump or fan, by controlling the energy that goes into the motor, rather than restricting the flow of a process running constantly at full speed. Running a motor at full speed while throttling the output is like driving a car with one foot on the accelerator and the other on the brake; a part of the produced output immediately goes to waste. A variable speed drive can save over 60% of the energy. This is possible as it controls the energy at source, only using as much as is necessary to run the motor with the required speed and torque - much in the same way as the accelerator in the car controls the engine revs. As acceptance of the technology increases, variable speed drives are gaining market share across a range of industries. In particular, variable speed drives can dramatically reduce energy consumption in fan and pump systems. A pump or fan running at half speed consumes only one-eighth of the energy of one running at full speed. Or, put differently: the power required to run a pump or a fan is proportional to the cube of the speed. This means that if 100% flow requires full power, 75% requires (0.75)^3= 42% of full power, and 50% flow requires (0.5)^3= 12.5% of the power.

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