An actuator that is driven by non-linear movement for creating linear movement is called linear actuator. This is not like the rotary motion of the electric motor. A linear actuator is an assembly or system, which creates force and motion alongside a straight line with the use of energy source that is applied externally. The use of hydraulic linear actuators is one of the most widespread techniques of attaining linear movement. The hydraulic linear actuators are also called hydraulic actuators or hydraulic cylinders. These are actually linear movement piston, which is actuated by fluid pressure and are enclose within a cylinder. There are two cut off sides of a hydraulic piston that are either de-pressurized or pressurized for achieving linear motion of the piston in order to create linear force as well as movement.
A model of hydraulic linear actuators is the hydraulic cylinder, which is used by the technicians for accessing the base of a vehicle for the purpose of maintenance. Other than this, there are many other applications where hydraulic linear actuators are used. The liquid pressure that is supplied to the actuator is supplied either by electric pump or by the means of manual liquid pump. The hydraulic actuators or cylinders chiefly engage a hollow cylinder with a piston that is inserted into it. The pressurized as well as de-pressurized sides of this piston, helps in accomplishing precise and controlled linear dislodgment of this piston. The complete design of these actuators is based on rules of hydraulics.
The name hydraulic linear actuators refer to a piece of equipment that is controlled with the aid of the hydraulic pump. When it comes to the application of hydraulic linear actuators, these are utilized in almost every kind of electronic device, which call for linear motion. Appliances like pumps, power drills and many other industrial appliances frequently depend on such hydraulic actuators for moving the objects.
Hydraulic linear actuators are also utilized in some sort of motors and are also often employed in robotics industry for providing motor skills to the robots. Every different class of such actuators is constructed differently and comes with their own unique advantages. The best thing about hydraulic actuators is that they have the ability of producing huge amount of pressure and are favorable for hardwearing applications. On one side, these actuators can produce high forces, but on the other side, there are many disadvantages as well.
The hydraulic linear actuators can leak and these also need position response for improved repeatability. These actuators also require an outer hydraulic pump. Even though such actuators are available in a number of designs, yet some of the designs are suitable only for the purpose of compression. At the present time, hydraulic linear actuators are preferred more than the electric linear actuators. The main reason behind this is the lower cost of hydraulic cylinders as compared to electric ones. For choosing an apposite actuator, the requirements of the application have to be taken into account. In case more than one actuator in required for a specific type of application, then the cost of installing hydraulic actuators can be more than electric actuators. This is because ancillary equipments such as pump, oil tank, filler system, tubing, and sometime even an accumulator are required for a hydraulic system. Therefore, make sure that you consider the application before using such actuators.
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