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How Does A Linear Actuator Work?

How Does A Linear Actuator Work?

Linear actuators work by moving an object or piece of equipment in a straight line, moving an object extremely accurately and repeatably if required. The primary reason for designing a linear actuator right into a system is for the necessity to move a payload in a linear fashion reasonably than a rotary one. As most typical electric motors are rotary, a linear actuator is used to transform rotary motion to linear motion.

The electrical motor is generally related 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 variety of motor sizes might be mounted to those actuators depending on requirements.

Linear actuators have incorporated linear bearings that support the moving payload, as well as rotary bearings that assist either the lead screw, ball screw or belt pulleys. This then permits them to operate as ‘stand-alone’ units, making them simple to mount into current machines and eliminating the need to design/manufacture very pricey customized parts. To increase the load capacity and stability of a linear actuator system, they are often paired up with the payload carried between them, equivalent to in an XY gantry model stage. In this case, a shaft or belt is often used to keep the two actuators in sync with each other.

Features of Linear Actuators
Linear Actuators have the following features:

High repeatability
Positioning accuracy
Smooth operation
Long life
Easy upkeep or upkeep free
Protection rankings 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 utilized in numerous applications that require a load to either be lifted, lowered, pushed, pulled, rotated or positioned. Linear Actuators are utilized in industries together with:

Packaging
Food processing
Industrial vehicles
Factory automation
Material handling
Clean energy
Printing
Automotive
Machine device
Marine
Aerospace
Defence
Pharmaceutical
Types of Linear Actuators
Picking the proper type of linear actuator on your motion application will help you achieve one of the best results. Lead Screw Actuators, Ball Screw Actuators and Belt Actuators are three types of linear actuators that can be used 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 pushed screw or an AC induction motor are probably 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 could be an advantage as it helps to keep the payload stationary whilst not in motion. Applications include agricultural equipment and manual lift systems, the place safety and reliability are more critical than precision and performance.

A Ball Screw Actuator uses a high precision nut with recirculating ball bearings that rotate round a ground screw thread. In precept this is similar to a typical 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 really environment friendly method of converting 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 similar to machine instruments, scientific devices and medical systems.

Belt actuators work the place a belt is carried between two pulleys and attached to the moving carriage, then because the belt rotates the carriage is pulled along the actuator. One of many pulleys is pushed by a motor which is generally mounted perpendicular to the actuator and matched utilizing a versatile coupling. They offer a relatively low-price alternative, as they inherently have a decrease level of precision. Belt driven linear actuators are very good for long journey and high linear speed applications such as packaging and automatic material handling systems.
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