Linear actuator

Linear actuators from Festo are double-acting pneumatic piston actuators. The sturdy, corrosion-resistant design of the actuators is ideal for use in process automation applications in harsh and explosive ambient conditions.
Actuators with different diameters, stroke lengths and standardised mounting interfaces are available for different installation situations. The linear actuators are suitable for opening/closing and control applications. Special product versions with an integrated displacement encoder or fully integrated positioner are available for control applications. Applications for linear actuators can be found in numerous industrial segments of process automation, such as linear movements for process valves (knife gate valves, shut-off valves, dosing slides, pinch valves) or swivel movements for damper control (ventilation flaps, turbine blade adjustment, etc.).

FAQs – frequently asked questions clearly explained

What is a linear actuator?

A linear actuator is a means for converting rotational motion into push or pull in one direction, which can be used for lifting, dropping, sliding, or tilting of machines or materials. They provide safe and clean motion control that is efficient and maintenance free.

Electric linear actuators use a DC or AC motor with a series of gears and a lead screw to push the main rod shaft. The difference between actuators is determined by the size of the motor, which can range from 12v DC to 48v DC.

Static and dynamic are the load capacity variables for a linear actuators. Dynamic load capacity is the amount of force being applied when the actuator is in motion. Static load capacity is when the actuator is motionless and holding a load in place.

Actuators open automatic doors, move car seats forwards and back, and open and close computer disk drives. The basic principle behind a linear actuator is the concept of an inclined plane, where the lead screw of the actuator continues along a ramp of small rotational force

How does a linear actuator work?

A linear actuator typically works by converting rotary motion from a motor or other power source into straight line. This is usually done through a gear reduction system, such as a lead screw or a rack and pinion, that amplifies the rotary motion into linear motion.

The most common type of linear actuator uses a lead screw, which is a threaded rod that is turned by a motor. As the lead screw rotates, a nut that is attached to the load moves along the thread, causing the load to move in a linear fashion.

In a rack and pinion configuration, a linear actuator uses a pinion gear that meshes with a linear rack. As the pinion rotates, it causes the rack to move linearly along the axis.

In order to move a piston inside a cylinder, which then results in linear motion, compressed air enters in a pneumatic linear actuator. Hydraulic linear actuators use pressurized liquid to move a piston within a hydraulic cylinder.

In all cases, linear actuators are controlled by an electronic control system that regulates the power and motion of the actuator. This control system can be adjusted to vary the speed and force of the actuator's motion, and can also be used to position the actuator at specific locations.

Where do we use linear actuators?

Linear actuators are used in a wide range of applications, including:

• Industrial automation, such as conveyors, packaging equipment, and material handling systems, to provide precise linear motion and positioning.

• Robotics applications: to provide precise linear movement and positioning of robotic arms and other components.

• Factory automation, such automotive systems, (power seats, power windows, and sunroofs).

• Medical equipment: such as hospital beds and surgical tables.

• Aerospace applications: such as flight control surfaces and landing gear.

Types of Linear Actuators

There are several types, each with their own unique characteristics and applications. Some of the most common types include:

Electric linear actuator: This actuator use an electric motor to power the movement of a lead screw or a rack and pinion. It is commonly used in industrial machinery, robotics, and home automation.

Pneumatic linear actuators: These actuators use compressed air to power the movement of a piston inside a cylinder. These pneumatic actuators are commonly used in industrial machinery, aerospace, and medical equipment.

Hydraulic linear actuators: These actuators use pressurized liquid to power the movement of a piston inside hydraulic cylinders. They are commonly used in construction equipment, heavy machinery, and off-road vehicles.

Servo linear actuators: These actuators uses a servo motor to drive the lead screw or ball screw. They are commonly used in robotics and automation equipment where precise motion control is needed.

Voice coil linear actuators: These actuators uses a magnetic field to drive a coil of wire, which then moves a load in straight line. They are commonly used in applications that require high speed, high accuracy and high forces.

Linear Motor actuators: These actuators uses a linear motor to move a load in a linear movement. They are commonly used in applications that require high speed, precise control and high force.

Each type of linear actuator has its own advantages and disadvantages, and the right choice will depend on the specific requirements of the application.

Servo actuator vs linear actuator

A servo actuator is a type of actuator that uses a closed-loop control system to accurately position a load, while a linear actuator is an actuator that converts rotary motion into linear motion. Servo actuators typically have higher precision and accuracy than linear actuators, but are also more complex and expensive. Linear actuators, on the other hand, are more simple and cost-effective, but may not have the same level of precision and accuracy as servo actuators.

Linear actuator motors

A linear actuator motor is an electric motor that is used to power a linear actuator. Linear actuator motors typically convert electrical energy into mechanical energy by rotating a shaft, which in turn drives the linear actuator's mechanism to extend or retract. These motors can be either DC or AC, and can be powered by a variety of voltage. The most common types of linear actuator motors are leadscrew-based, belt-driven, and ball screw-based.