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2. Ball screw - Wikipedia

   en.wikipedia.org/wiki/Ball_screw

   Two ball screws, including close-ups of the ball assembly of the top screw. Left inset: recirculating tube removed showing retainer bracket, loose balls and tube. Right inset: closer view of the nut cavity. A ball screw (or ballscrew) is a mechanical linear actuator that translates rotational motion to linear motion with little friction.

3. Linear actuator - Wikipedia

   en.wikipedia.org/wiki/Linear_actuator

   A traveling-nut linear actuator has a motor that stays attached to one end of the lead screw (perhaps indirectly through a gear box), the motor spins the lead screw, and the lead nut is restrained from spinning so it travels up and down the lead screw. A traveling-screw linear actuator has a lead screw that passes entirely through the motor.

4. Linear motor - Wikipedia

   en.wikipedia.org/wiki/Linear_motor

   Linear motors are commonly used for actuating high performance industrial automation equipment. Their advantage, unlike any other commonly used actuator, such as a ball screw, timing belt, or rack and pinion, is that they provide any combination of high precision, high velocity, high force and long travel. Linear motors are widely used.

5. Roller screw - Wikipedia

   en.wikipedia.org/wiki/Roller_screw

   A roller screw, also known as a planetary roller screw or satellite roller screw, is a low- friction precision screw-type actuator, a mechanical device for converting rotational motion to linear motion, or vice versa. Planetary roller screws are used as the actuating mechanism in many electromechanical linear actuators.

6. Rack and pinion - Wikipedia

   en.wikipedia.org/wiki/Rack_and_pinion

   Rack and pinion. A rack and pinion is a type of linear actuator that comprises a circular gear (the pinion) engaging a linear gear (the rack). [1] Together, they convert between rotational motion and linear motion: rotating the pinion causes the rack to be driven in a line. Conversely, moving the rack linearly will cause the pinion to rotate.

7. Actuator - Wikipedia

   en.wikipedia.org/wiki/Actuator

   Actuator. An actuator is a component of a machine that produces force, torque, or displacement, usually in a controlled way, when an electrical, pneumatic or hydraulic input is supplied to it in a system (called an actuating system). [1] An actuator converts such an input signal into the required form of mechanical energy.