What Is a Linear Actuator? How It Works, Types & Uses

A linear actuator is a device that creates motion in a straight line. It is commonly used when a mechanism needs to push, pull, lift, lower, open, close, tilt, or position an object. Electric linear actuators are widely used in automation systems, machinery, furniture, lifting mechanisms, access systems, solar-tracking equipment, and many other projects.

What Does a Linear Actuator Do?

A linear actuator converts an input source into controlled straight-line movement. In an electric linear actuator, an electric motor drives an internal mechanical transmission that moves the actuator rod inward or outward. The resulting motion can be used to move or position another part of a system.

The required actuator depends on the actual mechanism. Force, stroke, speed, voltage, installation length, environmental exposure, duty cycle, mounting geometry, and control requirements should all be considered before selecting a model.

How Does an Electric Linear Actuator Work?

A typical electric linear actuator uses a DC motor and an internal drive mechanism to convert rotary motor motion into linear movement. Reversing the motor direction reverses the direction of actuator travel. Depending on the actuator and control system, the movement can be operated with switches, relays, wired controllers, wireless controllers, or other compatible control equipment.

Many linear actuators also include built-in limit switches that stop travel near the end positions. However, controller compatibility, feedback functions, synchronization capability, current requirements, and wiring must be verified for the specific actuator and complete system.

Key Specifications of a Linear Actuator

Force describes how much push or pull capability the actuator provides. The correct force requirement should be determined from the real mechanism rather than from object weight alone.

Stroke is the distance the actuator rod travels between the retracted and extended positions.

Speed describes how quickly the actuator moves. No-load speed and loaded speed may be different, so loaded speed is important when evaluating motion under working conditions.

Voltage must match the electrical architecture of the system. Common HyHaven actuator configurations include 12V DC and 24V DC versions.

Installation length determines whether the actuator physically fits when retracted and extended. Stroke alone is not enough to confirm fit.

IP rating indicates resistance to ingress from dust and water under defined test conditions. It should not be treated as a blanket guarantee that an actuator is suitable for every outdoor or wet environment.

Common Types of Linear Actuators

Electric linear actuators are commonly selected for projects where controllable linear motion is needed from an electrical system. Other linear-motion technologies can include hydraulic and pneumatic cylinders, but their power systems, control methods, installation requirements, and operating characteristics differ significantly.

Within electric linear actuators, models can differ substantially in force, stroke, speed, voltage, IP rating, installation dimensions, duty cycle, feedback capability, and mounting configuration. There is no single actuator that is automatically correct for every application.

HyHaven Linear Actuator Range

These specifications are useful for comparison, but model selection should still be based on the complete mechanical and electrical requirements of the project.

How Do I Choose the Right Linear Actuator?

Start by defining the required force, travel distance, available installation space, operating speed, system voltage, expected duty cycle, environmental exposure, mounting geometry, and control method. Then compare those requirements with verified actuator specifications.

For a more detailed model-selection process, see the HyHaven Linear Actuator Selection Guide.

Frequently Asked Questions

What is a linear actuator?

A linear actuator is a device that produces movement along a straight line. It can be used to push, pull, lift, lower, tilt, open, close, or position a mechanism.

What is an electric linear actuator?

An electric linear actuator uses an electric motor and mechanical drive system to create controlled linear movement.

What is stroke length on a linear actuator?

Stroke length is the distance the actuator rod travels from its retracted position to its extended position.

Should I choose a 12V or 24V linear actuator?

Choose the voltage that matches the system power architecture, and verify current requirements and the ratings of the controller, switch, relay, and power supply. Matching voltage alone does not prove complete system compatibility.

How much force does a linear actuator need?

The required force depends on the actual mechanism, including load, mounting angle, leverage, friction, direction of movement, and engineering margin. Object weight alone is not enough to determine actuator force.

Need Help Comparing Linear Actuators?

Browse the HyHaven linear actuator range or send us your required force, stroke, available installation length, voltage, duty cycle, environment, and control requirements for product-selection support.