Linear Actuator Controller Buying Guide: How to Choose Yours

You need the right controller before you wire a linear actuator. A linear actuator controller reverses motor polarity, manages channels, reads feedback when your project needs it, and gives you a switch, remote, or automation input. Choose it by actuator count, current draw, synchronization needs, feedback type, voltage, duty cycle, and how much position control the project actually needs.

What is a linear actuator controller buying guide?

It helps you match a controller to the actuator job before you buy parts. It turns switches, remotes, relays, feedback sensors, and channels into a clear control requirement.

Simple Explanation

Think of the controller as the traffic director between your power supply, your actuator, and your hand control. A simple project needs extend and retract. A multi-actuator lift may need feedback, synchronization, current capacity, and fault planning.

Use the formula below to calculate minimum controller current.

I_controller ≥ N × I_max × SF

How do you use this guide?

You use this guide at the point where actuator specs meet wiring. Pick the controller after you know voltage, maximum current, actuator count, whether the load must stay level, and whether the user needs a rocker switch, remote handset, PLC, Arduino, or preset position input.

Get this wrong and 3 failures show up quickly. The lift racks. The controller trips. The wiring heats. None of those problems come from the actuator alone. They come from the actuator and controller acting as a system.

Suitable Applications

Controller selection matters most when the actuator does more than push a light door in a straight line. These applications usually create a buying decision because the controller changes the safety, wiring, and user experience.

Where do you use a linear actuator controller?

You use it anywhere a person or automation system needs to command actuator motion. The same controller questions appear in robotics, RV slide-outs, CNC machine doors, consumer laptop-style lift mechanisms, lab fixtures, hidden appliance lifts, automated hatches, and machine access panels.

A 1-actuator cabinet door may only need a polarity-reversing switch. A 4-actuator platform needs a controller that can compare position and correct drift. That difference drives the buying decision.

How does a linear actuator controller work?

A controller does 3 jobs. It routes DC power to the motor, reverses polarity to change direction, and reacts to inputs from switches, remotes, feedback sensors, or automation hardware.

1. The user input tells the controller to extend, retract, stop, or move to a preset.
2. The controller sends motor power to each actuator channel.
3. The controller reverses polarity when the command changes direction.
4. Feedback models send position signals back to the controller.
5. Synchronization logic compares channels and adjusts outputs to reduce position error.

A basic switch does not know actuator position. A feedback controller can know relative position because it reads signals from the actuator. That matters when 2, 3, or 4 actuators carry the same load.

What controller type fits your project?

Start with the simplest control method that actually solves the problem. Do not buy feedback control just because it looks more technical. Use it when the mechanism needs it.

For setup detail on synchronized control, use the FIRGELLI FCB-2 linear actuator controller guide. For setup videos and troubleshooting, use the FCB setup and video guides. The FCB-1 non-remote control box guide covers the non-remote control box version.

How many channels do you need?

Count 1 channel for each actuator that needs independent control. If 2 actuators always move together and leveling does not matter, a paired circuit can work, but each actuator still adds current draw.

If the load must stay level, give the controller a channel for each actuator so it can compare positions and correct drift. This matters on wide lids, 4-leg platforms, and lift frames where a small position error creates a large rack force.

For 2-actuator wiring details, read How to control a linear actuator using a 2 channel remote control. For synchronized layouts, compare How to Synchronize Two Linear Actuators Guide: Sync Setup and How to Synchronize Four Linear Actuators Guide: Wiring Setup.

What does feedback change?

Feedback changes the controller from a simple power-reversing device into a position-aware control system. Standard actuators can extend and retract through polarity reversal, but they cannot report position to the controller.

For a Hall actuator, a sensor reads alternating magnetic poles on a rotating disk inside the gearbox. For an optical actuator, a sensor reads light pulses through slots in a rotating disk. The sensor does not measure direct rod travel; the controller converts gearbox rotation pulses into estimated position after calibration.

From the controller side, Hall and optical units usually act like pulse-signal devices. You must match voltage, wiring, pulse type, pulse count, direction handling, and calibration. If you skip that match, the controller may count wrong, lose direction, or stop synchronization.

Potentiometer feedback works differently. It gives an analog position voltage from a wiper moving along a resistive track tied to actuator travel. It does not measure actuator force, side load, or mechanical binding.

For deeper feedback choices, use feedback linear actuators, Feedback Options for Linear Actuators, Linear Actuator Feedback Devices: Potentiometers vs Encoders, and Linear Actuator Potentiometer Feedback Guide: Read Position.

The FCB-2 can synchronize 2, 3, or 4 actuators, and you can also use it with non-feedback actuators where the control setup calls for it. For true synchronized position matching, use actuators with compatible feedback and matching stroke, speed, voltage, and load capacity.

How should you size current and force margin?

Controller sizing starts with current, not force. Force tells you whether the actuator survives the job. Current tells you whether the controller, switch contacts, wiring, and power supply survive the electrical load.

Use the actuator maximum current when the data gives it. If the data only gives running current, measure the current under real load or add a larger margin. Do not size a controller from no-load current.

Use this load check before you choose the actuator-controller pair.

F_actuator ≥ (W ÷ N_load) × SF_load

This force formula does not replace hinge torque math, side-load checks, or buckling checks. It gives you a quick screen so you do not buy a controller for an actuator that cannot move the load. Use the linear actuator calculator and linear actuator selector when geometry drives the force.

How do you use this calculator?

Use the selector below as a quick screen after you know actuator count, feedback needs, synchronization needs, and user-control method. Treat the result as a controller direction, not a final electrical design.

1. Enter the number of actuators that move in the same system.
2. Select whether the actuators must stay synchronized.
3. Select whether the application needs feedback, presets, or automation input.
4. Click Calculate to see your result.

After the selector points you in a direction, use the linear actuator wiring diagram generator to plan actuator count, power, switches, feedback, accessories, and controller wiring.

Simple Example

Inputs: 2 actuators, 5 A maximum current each, no presets, no synchronization.
Current check: 2 × 5 A × 1.25 = 12.5 A.
Output: choose a controller or switching circuit that handles at least 12.5 A total and gives paired extend/retract control.

Scenario-Based Worked Example

Let’s calculate the controller requirements for a 2-actuator storage platform. The platform and load weigh 120 lbs (54 kg). The mechanism uses 2 actuators, and the platform must stay level during travel.

Start with force screening:

F_actuator ≥ (W ÷ N_load) × SF_load

F_actuator ≥ (120 lbs ÷ 2) × 1.5 = 90 lbs

That means each actuator needs at least 90 lbs before geometry losses. If the design needs a 10-inch stroke, the Utility Linear Actuator fits the screening window because its listed force range runs 110 to 330 lbs, its stroke range runs 2 to 12 inches, it has IP66, it has Hall Effect feedback, and it supports synchronization.

Now size the controller current. Assume the actuator label or data sheet gives 6 A maximum current per actuator. The synchronized lift moves both actuators together.

I_controller ≥ 2 × 6 A × 1.25 = 15 A

The controller and power supply need to handle at least 15 A for this screening case. Because the platform must stay level, use synchronized control rather than a simple paired switch. The FCB-2 can synchronize 2, 3, or 4 actuators, so it fits the control style for this layout when the actuator feedback and setup match the project.

If you choose non-feedback actuators such as a simple rod actuator, you can still extend and retract them with a switch or controller, but the actuators may drift under different loads. A controller cannot correct position error without a usable position signal.

What trade-offs matter?

Controller selection always trades simplicity against control. Faster buying decisions come from naming the failure you want to prevent.

For speed control details, see How to use a linear actuator with a $19 speed controller. For control products, start with actuator controls.

Related FIRGELLI Products

The actuator you choose affects controller choice. Feedback, stroke, force, IP rating, and synchronization support all matter before you buy the controller.

To browse the full actuator range, use linear actuators.

What should you wire before you buy?

Draw the wiring before you buy the controller. That drawing should show the power supply, fuse, controller, switches, remote receiver, feedback wiring, actuator channels, and any automation input.

Keep motor power wiring and feedback wiring clear in your diagram. Motor wires carry load current. Feedback wires carry signal information. When builders mix those mentally, they undersize contacts or connect feedback to the wrong terminals.

Use fuse protection close to the power source, size wire for the current and length, and match every switch or relay contact to DC motor current. AC contact ratings do not automatically translate to DC actuator control.

FAQ

About the Author

Robbie Dickson is the Chief Engineer and Founder of FIRGELLI Automations. With a background in aeronautical and mechanical engineering at Rolls-Royce, BMW, and Ford, he has spent over 2 decades building precision motion control systems, from linear actuators for robotics to active aerodynamic braking systems for supercars.