5 Positioning Control System
Digital Positioning System 2000 11
5.2 Design and Mode of Operation
With this type of positioner, a multi-polar magnetized permanent magnet is mounted on
the output shaft. Opposite the permanent magnet an armature with the working coils is
mounted. When current is applied to the working coils, torque in one direction is
generated. Reversing current polarity will generate torque in the opposite direction.
By using special materials and long-term lubricants the positioners are maintenance-free
and have a long service life.
The actuator output shaft is provided with a feedback cam for contactless sensing by a
probe transmitting the accurate output shaft position to the control unit.
The control unit is installed on the back side of the positioner under a separate cover,
opposite of the output shaft journal.
When the actuator is driven against a mechancial stop current limitation will take effect
after approx. 20 seconds and reduce current to the actuator to a value sufficiently low to
prevent damage to the actuator.
Actuators StG 2040.XX-SV-PD and 2080.XX-SV-PD
Figure 2: Principle of StG 2040.24-SV-P and 2080.22-SV-P
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