DC linear actuators are electromagnetic devices that use direct current (DC) power to create linear motion. They are used in various industries and environments, such as machine actuators, door controllers, and TV lifts. They operate using gear or worm arrangements and come in various sizes and power outputs. DC installations offer benefits such as low voltage, small wire size requirements, and low operating costs.
A DC linear actuator is an electromagnetic switching or actuation device used to activate a variety of secondary mechanisms. These devices are defined by two specific characteristics: a linear actuation output and the exclusive use of a direct current (DC) power source. The actuators transfer the rotational output of their motors to the final rectilinear drive motion via gear trains or lead screw arrangements. The DC power sources used to drive the DC linear actuator typically require the inclusion of a step down and rectifier unit, but offer the benefits inherent in a low voltage installation. This type of actuator is used in a wide variety of industrial, automotive and domestic environments including machine actuators, door and vent controllers, and TV lifts.
Also known as linear motors, linear actuators take the rotary motion of an electric motor and translate it into a straight line or linear working output. This rectilinear motion is used to drive a huge number of different devices and processes, from tiny precision camera functions to huge industrial machinery components. The DC linear actuator is a specific example of this linear motor family, defined by its use of direct current (DC) motors as its power source and its linear motion output. DC power is produced by removing the reverse polarity loop from mains alternating current (AC) power using a rectifier. This means that a DC linear actuator will either have a rectifying circuit built in or will require one to be installed before use.
These DC actuators operate in the same way as other linear motors and typically achieve rotary/linear transfer via a gear or worm arrangement. Gear arrangements commonly used in these actuators include worm and rack-and-pinion types. The DC linear actuator is available in a variety of sizes, actuation lengths, and power outputs. Smaller examples can only extend an inch or so and exert less than 10 pounds (4.5 kg) of pressure, while heavy examples can extend several feet and exert more than 1,000 pounds (454 kg) of pressure.
The DC linear actuator is often considered a desirable actuation solution due to the benefits that go hand in hand with DC installations. These include low voltage and generally lower currents, lack of electrocution potential, small wire size requirements, and low operating costs. These features, along with the general efficiency and power of linear actuators, make the DC linear actuator a good choice for both heavy industrial and light domestic installations.
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