The Var-Spe Hydraulic Variators allows you to make adjustments from zero rpm up to the speed of the electric motor with a ratio of 1:30 and up to 1:35 with 60 Hz motors. The handwheel in the centre of the unit can be set, if required, to control the range of speed required in both directions. It is also worth noting that no frequency inverter or mechanical variator can reach such wide speed ranges. The Var-Spe variator is also designed to work in very harsh environments where dust, humidity and vibrations are limiting factors for other solutions.
Hydrostatic transmission is basically a way of controlling the flow of hydraulic fluid in a variable displacement pump or primary pump and a constant displacement pump or secondary pump. Speed control is achieved by controlling the flow of oil between the primary and secondary pumps. The variators are fitted with safety valves that protect the unit in cases of overload or sudden stops.