Curtiss-Wright | GSM Series Rev. U PN29959 3/28/17
14
3.4 General Operation
The GSM 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 GSM Series linear
actuator.
The relationships between the rotary motion of the motor and the
linear motion of the actuator correspond 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 GSM
Series actuator rod.
For more information on sizing and selection of GSM Series actuators
and servo amplifiers, 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 GSM 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 GSM Series actuator or damage to the
stator will result.
Care should be taken not to exceed the physical travel
limits of GSM 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. Care should be taken to avoid high speed impact with
objects of high rigidity that immediately stop the travel of the
actuator with no deceleration or energy absorption. An example
would be a high speed impact of two solid steel parts. The resulting
impact will create a very short effective deceleration time. Kinetic
energy contained in the rotating inertia of the actuator and motor
can possibly generate extremely high impact forces that exceed the
mechanical capacities of the actuator and cause physical damage
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