Operating principle of Variable-Speed Turbo Couplings Voith variable-speed turbo couplings are fluid couplings. The coupling transmits the initial power by means of the kinetic energy of the fluid, mostly oil, circulating in a closed working chamber between the pump impeller on the driving shaft and a turbine wheel, connected to the output shaft. The fill level of operating fluid can be varied during operation between "full" and "drained", thus enabling exact and dynamic speed control of driven machine. Compared to conventional throttle control speed control provides higher efficiency when operating at partial load Wearfree power transmission Reduced wear on motor and machine as a result of smooth machine acceleration Sturdy design Long service life Highest reliability Highest availability Damping of shocks and vibrations Quick reaction times and high adjustment precison The relevant type and design depends on the technical requirements and the specific driven machine