The technology invented and patented by Var-Spe solves the need for varying the speed of an electric motor through an innovative approach that is completely different from that of all other alternative solutions.

Speed is varied physically exploiting the properties of the fluid and without electricity.
The Var-Spe technology is based on the principle of hydrostatic transmission: it consists of two units, i.e., a variable displacement pump and a fixed displacement hydraulic motor, both with radial pistons.

The input shaft transmits the constant speed of the upstream motor to a series of pistons that compress and expand the oil inside the cylinders. By varying the oil flow rate and pressure, the speed of rotation transmitted to the output shaft is varied as well.



  • High torque even at low revolutions: thanks to the high pressures that can be reached
  • Wide range of speed variation: from zero to that of the electric motor
  • Possibility of operating in aggressive environments: water, dust, temperature, acid
  • Long service life: there are no friction elements and the components are less subject to wear since they are always lubricated
  • Reliability: the speed adjustment is always precise even after many years because it is done by modifying the stroke of the pistons
  • Cost-effectiveness: long life cycle for the connected components (there is no stress on the electric motor because it is always running at the same speed)
  • Simplicity: Adjustment is simple and intuitive, no programming is needed, and it is easy to install and start


  • Only top-quality materials are used
  • All components are designed and made in Italy
  • Each variator is assembled and tested at our plant (100% inspection)