Electric Motor Linear Actuator

Electric motor linear actuator KT0805-30H arrives as one sealed assembly with its travel already set, which is the part a bezel-mounted door cares about: nothing to adjust inside the appliance, nothing to line up once the moulding is closed. An 8 mm tube and a 96.5 mm body fit beside a lens in a front panel with about 110 mm of depth, and the 5 mm rod pushes the shutter along the same axis as its rails.

The head is the end that meets the appliance. It unscrews, so a bracket already tooled for a 3 mm pin or an M3 stud takes the rod without a new moulding; where a cradle will not fit, the outer tube can be threaded and locked through the panel with a nut.

Two versions share the tube and the 30 mm stroke. The H version is the fast one: 0.3 kg at 9 mm/s unloaded and 6 mm/s under load, which puts a shutter clear of the lens in 3.3 s. The L version is the thrust one: 2 kg at 2 mm/s unloaded and 1.4 mm/s under load, 15 s and 21 s for the same 30 mm. The choice is made by the mechanism - how quickly the movement has to finish against how much mass it has to move.

No encoder and no position output are fitted, and travel is not adjustable in service: the length is ordered to the drawing, 30 mm to 120 mm as standard and longer on request.

• 3.3 s for 30 mm. Unloaded the full stroke takes 3.3 s; at the rated 0.3 kg it takes about 5 s. The gap between the two figures is the first thing a designer notices, because it sets how light the moving part has to be for the start-up sequence to stay short.
• 0.3 kg (3 N) across the whole stroke. Force holds to the far end, so a door that drags slightly on its rails finishes its travel instead of stalling short of the stop.
• 100 N of holding resistance. The lead screw resists back-driving, so the door stays where it was left with nothing energised and no heat inside a closed chassis.
• About 1 W. A 0.2 A draw at 5 V sits on the standby rail most appliances keep alive, which is what allows a shutter to close after the main board has powered down.
• 96.5 mm of body, 8 mm of tube. Most of the length is motor and screw; the rest is the head and the limit board, which sits outside the tube and needs clearance of its own.
• Under 50 dB. Quiet enough to be covered by the fan of the appliance during the seconds it runs.
• IP56 on 304 stainless steel. Indoors the rating does dust work: a dust-protected body that survives a wipe-down cloth, on a guide with no plating to wear through.

The mechanism this model was sized around is the motorised lens door of a home projector. A front bezel carries a short shutter that slides across the lens while the projector idles and retracts before the image appears. Three requirements decide whether a given rod can do it.

Clearance before ignition. A shutter still across the lens when the lamp strikes is a plastic plate in the beam, and the result is a scorched door and a lens that never comes clean. Appliances avoid it by waiting, so 3.3 s is not a convenience but part of the start-up sequence, and every second of it is a second the lamp stays off.

Closed position without power. Projectors are unplugged, switched off at the wall and packed for a shoot. A door that falls open in transit exposes the lens to dust and to whatever is in the bag. The screw holds it: 100 N of resistance, no solenoid left energised, no current drawn for a closed door.

Gravity in either direction. Half the installations hang from a ceiling, so the rod works against the weight of the door rather than with it. A screw drive does not care: the same 0.3 kg lifts a 150 g shutter as easily as it slides it sideways.

The arrangement it usually replaces is a solenoid with a return spring, which works on a bench and shows its limits once shipped: the spring decides the resting state, the door arrives with a click that a quiet room hears, and both end positions come from rubber bumpers rather than from the drive.

Where the moving part is a flap, a louver linkage or a small hatch instead of a shutter, the neighbouring cases are grouped on the applications hub, and the household versions sit under electronics and smart home actuators.

Body clearance and door clearance. The two numbers are counted separately: 96.5 mm for the body with the rod in, and 30 mm of travel on top of that. A moulding that clears the retracted body but leaves nothing for the rod jams the door against the lens ring, and the correction is a different stroke rather than a shorter hole.

Door guidance. A 5 mm rod pushed sideways bows and puts the bend into the screw. Two short rails, or a drawer slide, take the side load from a hand or a packing case; the rod is asked only to push along its axis.

Limit board clearance. The board sits outside the tube, so the body is not a plain 8 mm cylinder. A cradle cut for a cylinder pinches it, and a pinched board stops the door in the wrong place.

Door sealing. IP56 protects the drive. Dust on the glass is the shutter's job and its own seal, and a design that leans on the rod's rating will find dust on the lens.

Tube, screw, motor and limit board for this range are made and assembled in one plant, which makes a change of stroke or thread a production instruction rather than a sourcing exercise. Units are inspected under an ISO9001:2015 system that starts at incoming material and runs through dimensional checks, motor performance, electrical and insulation tests, salt spray and lead-bending, with a run to both stops before packing. The salt-spray step stays in even for an indoor part: it is the check that the stainless guide needs no plating.

CE and RoHS documentation is held on the certification page, the instruments used for those checks are listed under testing equipment, and the plant itself is described on about us. The inspection route from incoming goods to packing is set out on why us.

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