Linear actuator device

A linear actuator is an important mechanism that is based on a straightforward idea which can often be complex in execution. The most important trait of a linear actuator is that it transfers a turning motion into a straight line motion. Ball screws are types of linear actuators which transform rotary motion into linear, as well as roller screws, screw jacks and cam actuators.
 
Linear actuators which change turning to straight are known as mechanical actuators. Alternative types of linear actuators are known as electro-mechanical actuators, pneumatic actuators, wax and linear motors, hydraulic actuators and piezoelectric actuators.
 
The greatest distinction between electro-mechanical actuators and mechanical actuators is the motor that the EM actuator possesses. A turning energy is given to the system by the motor, which the linear actuator then transforms into linear motion. Pneumatic and hydraulic actuators are both very similar types of linear actuator. Both include a piston contained inside a cylinder. In terms of the hydraulic actuator oil or some other fluid is utilized to provide kinetic energy to the piston, thereby generating a linear motion. In terms of a pneumatic actuator a highly compressed gas is employed, in place of a liquid.
 
A wax motor is a simplistic type of linear actuator. This design incorporates a block of wax, which is melted using an electric current. Once the heat begins to melt the wax it starts to expand. The system also contains a piston that touches the wax block, which is moved linearly outwards as the block begins to expand, thus moving in a linear manner. This is very like a piezoelectric actuator, which utilizes an electric current to stimulate expansion in a particular type of metal. A linear motor is another basic design, which is essentially a rotary electric motor positioned on a flat object, thus generating linear motion.