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Variable Speed Motors

Variable speed motors usually operate under the control of variable frequency drives (VFDs) or other types of electronic controllers. These captive equipment controls allow for smooth, exact adjustments in motor speed, so that energy consumption can be lessened because the motor isn't consuming 100% power all the time.

A key benefit of variable speed motors is their energy efficiency. Unlike fixed speed motors, which consume just as much power when operating at low load conditions as they do at high load conditions (with a large amount of waste heat generated in the process), variable speed motors only consume the appropriate amount of power needed for the actual job being done. They achieve this by adjusting their speed to match the demands placed upon them—high demand for starting up a pump or conveyor, for instance, and maybe some significant oversizing relative to normal operation.

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