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Glossary Terms

Electric Linear Motion

Rodless screw and belt drive actuators, rod style screw and belt drive actuators, brushless servo motors and controls

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System that compares the output of a device (by monitoring position, velocity, and/or torque) with the desired outcome and makes corrections to minimize the difference.

Servo Motor

Motor used in closed loop systems where feedback is used to control motor position, velocity, and/or torque, usually expected to have high torque/inertia ratio.

Slew

Constant non-zero velocity portion of a motion profile.

Stall Torque

Maximum torque available at zero speed.

Stepper Motor

Motor which translates electrical pulses into motion, where the pulse rate controls velocity and position.

Stiffness

System ability to maintain accuracy when subject to disturbance.

Straightness

When traveling in a straight horizontal line, the side to side deviation within the horizontal plane of travel of the carrier.

Stroke length

The distance that the carrier and its load will move on the actuator.