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How does a Linear Actuator work?
Linear actuators work by moving an object or piece of equipment in a straight line, moving an object extraordinarily accurately and repeatably if required. The primary reason for designing a linear actuator into a system is for the need to move a payload in a linear fashion somewhat than a rotary one. As most standard electrical motors are rotary, a linear actuator is used to transform rotary motion to linear motion.
The electrical motor is generally linked to the linear actuator by a flexible coupling or a belt, enabling the motor to be mounted either axially or perpendicular to the linear actuator. A wide range of motor sizes will be mounted to those actuators relying on requirements.
Linear actuators have incorporated linear bearings that help the moving payload, as well as rotary bearings that help either the lead screw, ball screw or belt pulleys. This then allows them to operate as ‘stand-alone’ gadgets, making them easy to mount into current machines and eliminating the need to design/manufacture very costly customized parts. To extend the load capacity and stability of a linear actuator system, they are often paired up with the payload carried between them, reminiscent of in an XY gantry fashion stage. In this case, a shaft or belt is usually used to keep the 2 actuators in sync with every other.
Options of Linear Actuators
Linear Actuators have the following features:
High repeatability
Positioning accuracy
Smooth operation
Long life
Easy maintenance or upkeep free
Protection ratings available for some models
Suitable for harsh environments
Compact design
Rugged and reliable
Safe operation
Versatile
Industries and applications for Linear Actuators
Linear Actuators can be used in numerous applications that require a load to either be lifted, lowered, pushed, pulled, rotated or positioned. Linear Actuators are utilized in industries including:
Packaging
Food processing
Industrial vehicles
Factory automation
Materials dealing with
Clean energy
Printing
Automotive
Machine instrument
Marine
Aerospace
Defence
Pharmaceutical
Types of Linear Actuators
Picking the right type of linear actuator on your motion application may also help you achieve the very best results. Lead Screw Actuators, Ball Screw Actuators and Belt Actuators are three types of linear actuators that can be utilized in varied applications to produce motion.
A Lead Screw Actuator makes use of a plain screw/nut arrangement to translate the rotary motion from a motor to linear motion. A manually driven screw or an AC induction motor are essentially the most commonly used methods to provide the rotary motion, as they're generally utilized in low price and low precision applications. The ability of the actuator to ‘back drive’ is reduced over ball screw actuators as a result of low effectivity of the screw/nut. In some applications, this can be an advantage as it helps to keep the payload stationary whilst not in motion. Applications embody agricultural equipment and guide lift systems, the place safety and reliability are more critical than precision and performance.
A Ball Screw Actuator makes use of a high precision nut with recirculating ball bearings that rotate round a ground screw thread. In precept this is similar to a standard ball race with the load being transmitted by the rolling balls. The significant advantages of this system are high-precision and low friction, giving a very efficient methodology of changing rotary motion to linear motion. Stepper or servo motors are generally used to supply the rotary motion. Ball screw actuators are well suited to repeatable indexing and quick cyclic applications resembling machine tools, scientific instruments and medical systems.
Belt actuators work the place a belt is carried between pulleys and hooked up to the moving carriage, then because the belt rotates the carriage is pulled alongside the actuator. One of many pulleys is pushed by a motor which is generally mounted perpendicular to the actuator and coupled utilizing a flexible coupling. They offer a comparatively low-price alternative, as they inherently have a decrease stage of precision. Belt driven linear actuators are superb for lengthy travel and high linear speed applications akin to packaging and automatic materials dealing with systems.
Website: https://www.firgelliauto.com/collections/linear-actuators
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