Curtiss-Wright | EL30 Rev. H PN23942 6/14/16
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3.3 Mounting Considerations
As with any linear actuator product, misalignment of the EL Series
actuator with respect to whatever load the actuator is being used to
move is of great concern. Any misalignment will decrease the life of the
components within the actuator and also may create problems within
the application associated with misalignment. Therefore every effort
should be made to minimize misalignment as much as is possible.
3.4 General Operation
The EL Series linear actuators function in the same manner as a
brushless servomotor. The servo amplifier is used to rotate the motor at
controlled speed and torque, and for controlled numbers of revolutions
and move times. This rotary motion is translated into linear motion by
the internal planetary roller screw mechanism of the EL Series linear
actuator.
The relationship between the rotary motion of the motor and the linear
motion of the actuator corresponds to the following relationships:
Linear Distance Traveled (in)
= (Motor Revolutions)*(Roller Screw
Lead)
Linear Speed (in/sec)
= ((Motor RPM) / 60)*(Roller Screw Lead)
Linear Force (lbf)
= ((Motor Torque (in-lbf))*(2
)*(efficiency)) / (Roller
Screw Lead (in))
All of the above relationships require proper anti-rotation of the EL
Series actuator rod.
For more information on sizing and selection of EL Series actuators
and servo amplifiers to power them, consult the sizing and selection
section of the Exlar catalog.
Motor RMS current must be maintained at a level below the
continuous current rating of the EL Series actuator or damage
to the motor stator will result.
The peak current setting must be maintained at a level below the
peak current rating of the EL Series actuator or damage to the stator will
result.
Care should be taken not to exceed the physical travel limits of
EL Series Actuators. Doing so will cause the actuator to end-
crash internally. End crashes can physically damage the roller screw
and the internal components of the actuator.
