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Highly Dynamic 4-Quadrant Hydraulic Servo Drive


The 4-quadrant drive is used for the simulation of dynamic loads in shaft systems. For instance this takes place on the slat and flap system of the Airbus A380 in the High-Lift-Test-Center in Bremen. The drive consists of a hydraulic gerotor set (interior annular gear motor), which is controlled via a servo valve. It can run clockwise and anticlockwise as well as drive and brake. That is why the term 4Q Drive is used.

The construction design is extremely compact and low inertia. Possible accelerations can be above 100.000 rad/s2. In order to achieve a high rotational speed the supply lines are duplicated. Two lines per connection (A and B) go into the engine mount and conduct the volume flow from both sides into the gerotor. In lines A and B there is additionally one pressure control valve each. These valves provide hydraulic overload protection.
Two shear pin couplings are implemented to serve as a mechanical overload protection in the shaft system. The choice of shear pins limits the transferable torque in the shaft system.

The 4 Quadrants Drive has an EtherCAT® field bus interface. The signals: angle, rotational speed, torque and load pressure with a frequency of up to 5kHz are available.


  • Torque Control in 4 quadrants
  • Hydraulic free wheel with zero torque control
  • High speed up to 4000 rpm
  • High torque up to 250 Nm
  • Extremely low inertia J < 0,002 kgm2
  • Highly dynamic (+/- 1000 rpm in 10ms)
  • Small installation
  • Mountable in the shaft system
  • Drive shaft up to 1600 Nm
  • Hydraulic overload protection by pressure control valves
  • Mechanical overload protection by shear pins
  • Integrated torque and speed sensors
  • Digital torque and speed control
  • Control via EtherCAT® with EtherLab® technology
  • Open Software (GPL)

4-Q Antrieb

Tasks of IgH:

  • Concept and Design
  • Mechanical Construction
  • Complete Implementation
For further information, please contact: Dr.-Ing. S. Rotthäuser

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