10 Actuators
HELENOS V
25
10
Actuators
10.1
Design and Mode Operation
Stop Lever
Working Coil
Feedback System
Injection Pump
(no delivery item)
Control Rod Travel
(adjustable from 14 to 21 mm)
Lace up
Adapter Plate
Figure 12: Sectional Drawing of Actuator
A multipole-magnetised permanent magnet is mounted on the internal actuator shaft.
Opposite the permanent magnet a coil shell with the working coils is fixed. On feeding
current through the coils, torque and rotary motion in one direction is produced. Reversing
current polarity will produce torque in the opposite direction.
The lever which is fixed to the internal shaft is connected to the control rod of the injection
pump by a special linkage system. By this, the rotary motion of the internal shaft is directly
transmitted as a linear motion to the control rod.
On the actuator shaft, also the governor feedback is firmly mounted which operates
contact-free and transmits the position of the governor output shaft accurately to the
control unit. By this, the control unit is able to rapidly calculate the linkage adjustment as
required by speed changes, and to accommodate current accordingly.
An additional external lever provides the possibility of executing an emergency shutdown.
However, in order to stop the engine by means of this stop lever it will be necessary to
overcome the electric positioning force working in the direction of 100%. Therefore,
before executing an emergency shutdown by the stop lever, the voltage supply should first
be switched off.
