16
External stopper
If the kinetic energy - generated by the load exceeds the actuator’s threshold value, an external
dampening function must be provided to absorb the energy.
The figure below shows the correct installation of external stopper.
As a rotary actuator itself has a slight angular error due to the construction, use an external stopper
when accurate positioning is required.
Angle controlled by the
external stopper
Rotating angle of the actuator
without an external stopper
External stopper
External stopper
Secure a margin
Secure a margin
A port
B port
Correct position
External stopper
Incorrect position
Incorrect position
External stopper
The external stopper works
as a fulcrum, resulting in the
load’s inertia force being
applied to the shaft as a
bending moment.
External stopper
If an external stopper is
installed to the shaft on the
opposite side of the load,
the inertia force generated
by the load is applied
directly to the shaft.
When buffer such as
Shock Absorber is used,
or when load is within
allowable energy range,
single rod can be used.
