描述
Motion is expensive until you stop paying for it with hydraulics. A linear actuator turns 12 volts into 750 newtons of push or pull, at 10 millimetres per second, along a stroke you specify. There is no pump, no fluid, no compressor and no maintenance schedule beyond keeping the rod clean. It is the cheapest way to make a mechanism move on its own, and the reason automated doors, adjustable beds, roof vents and pop-up displays all use one.
The aluminium alloy tube carries a screw drive turned by a DC motor, and the rod extends and retracts without rotating, which means the load does not try to spin with it. Both ends of the travel contain a limit switch that cuts power at the extremes, so the motor cannot run against a mechanical stop and burn out. Remove power mid-stroke and the assembly self-locks in position, which is what makes it usable for a bed frame or a hatch that must hold where it was left.
Reversing direction is a matter of swapping polarity, so a simple DPDT switch, a relay board or a motor driver is enough to control it. Stroke lengths run from 50 to 400 millimetres, all at the same 750 newton rating, and the operating range covers minus 20 to 75 degrees Celsius. Rated power is 20 watts continuous with a 30 watt peak, and the working duty cycle is 20 percent, which is the honest number to design around.
Automation does not begin with software. It begins with one part that moves when it is told to.
What Sets It Apart
- ✦ 750 N / 160 lb push and pull capacity across every stroke length
- ✦ 50 to 400 mm strokes at a consistent 10 mm per second
- ✦ Built-in limit switches at both ends that cut power before the motor strains
- ✦ Self-locking screw drive that holds position when power is removed
- ✦ Non-rotating rod so the load cannot spin free under movement
- ✦ Aluminium alloy tube with -20 to 75 degrees Celsius range
- ✦ Polarity reversal control from a switch, relay or motor driver
Technical Specifications
- Load capacity: 750 N / 160 lb
- Input voltage: 12 V DC
- Speed: 10 mm per second
- Stroke options: 50, 100, 150, 200, 250, 300, 350, 400 mm
- Material: Aluminium alloy tube
- Rated power: 20 W continuous, 30 W peak
- Duty cycle: 20 percent
- Limit switches: Both ends, automatic cut-off
- Self-locking: Yes, holds position unpowered
- Operating temperature: -20 to 75 degrees Celsius
- Wiring: Two-wire, polarity reversing
- Certification: CE
Where It Belongs
Adjustable bed frames and recliner mechanisms are the classic use, where the self-locking screw holds a position without drawing current. Greenhouse roof vents use a short stroke actuator wired to a thermostat to open when the temperature climbs. Camper van builders fit them to lift a pop-top or a storage hatch, and home automation users drive a hidden cabinet or a TV lift. Agricultural and industrial rigs use them for louvers, dampers and small gates, and makers use them in robotic arms and prop mechanisms where a pneumatic cylinder would need a compressor. Anywhere a 750 newton movement needs to happen on command, the same part applies.
Frequently Asked Questions
Q: How do I reverse the direction?
A: Swap the polarity of the two power wires. A DPDT switch, a two-channel relay module or an H-bridge motor driver all do this, and none of them require modifying the actuator.
Q: What does a 20 percent duty cycle mean in practice?
A: Two minutes of running followed by eight minutes of rest, roughly. Exceeding that heats the motor and shortens its life, so size the stroke and speed around how often the mechanism actually moves.
Q: Will it hold a load when the power is off?
A: Yes. The screw drive self-locks, so a bed frame or hatch stays where it was left without a brake or a counterweight.
Q: How do I choose the stroke length?
A: Measure the distance the mechanism must travel and add a margin for the mounting geometry. The 750 newton rating is identical across all stroke lengths, so the choice is purely about travel.
Q: Can it push a load as well as pull it?
A: Both directions carry the same 750 newton rating, and the mounting holes at each end accept a clevis or pin joint so the assembly can pivot as it extends.
Q: Does it need a controller or can I use a plain switch?
A: A plain reversing switch is enough for manual control. Use a relay or driver board when the actuator is triggered by a sensor, a timer or a microcontroller.
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