9 Actuators
26
Digital Governor Basic System PANDAROS II
9
Actuators
9.1
Design and mode of operation
Fig. 11: Sectional drawing of actuator
A multi-polar magnetised permanent magnet is mounted on the actuator shaft. Opposite the
permanent magnet an armature is fixed. When current is given to the armature, a torque in
one direction is obtained. Changing the polarity of the current results in direction changes.
The use of special materials and long-time lubricants assures maintenance-free operation
and long working life of the actuators.
A feedback cam is mounted on the governor output shaft which is scanned contactlessly by
a probe, thus transmitting the precise position of the output shaft to the control unit.
If the actuator strikes against a stop, as may occur, e.g., under parallel mains operation or
may be caused by engine overload or cylinder failure, the current limitation will take ef-
fect. This reduces the current via an e-function such that no damage can occur on the ac-
tuator.
Permanet Magnet
Armature
Feedback Cam
Governor Output Shaft
Feedback Probe
Return Spring
