Adjustable speed drives change the speed of a driven shaft to a speed selected by the operator. Additionally, these drives are used to maintain the speed of a machine to very close tolerances: ±0.1% ...

Traction Drives Traction drives depend upon friction between a speed adjusting mechanism and specially shaped input and output plates to achieve adjustable speed with relatively high efficiency. In ...

The device that controls the fan speed is called a variable speed drive. Variable frequency drives are also used on pumps and cooling towers to match the demand of the space with the proper energy ...