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A coupling is a mechanism utilized to link the ends of two shafts together for the transmission of power. Its main objective is to unite two rotating machines while allowing for a certain amount of end movement or misalignment or both. A variable speed fluid coupling involves installing a variable speed drive between the motor and the load to allow the motor to accelerate without accelerating the load. The drive can be an eddy current clutch or a fluid clutch. This helps to control the rate of acceleration of the load and dissipate heat generated in the drive, which usually has better cooling than the motor. Check out the couplings for sale below on Surplus Record!