While it could be said that both linear actuator and Servo Linear actuator are the same and perform similar functions in most cases, they are still very different in many aspects. It is usually not possible to differentiate the two systems or equipment from each other and the precise area of applications each or both of them can be used unless their similarities and differences are identified.
We now have electric linear actuators in use for many applications. We also have some pneumatic and hydraulic form of linear devices in use in many areas as well. Linear actuator or device works on the basic principle of converting sometimes, a normal motor that possess high Torque rotary actuator into linear motion or movement. Linear device or actuator can be used on equipment or machineries that need over rotational movement, linear motion.
Linear device will have at a minimum
a) An electric motor
b) A cylinder, which enclose a lead screw and a tube.
Inside the cylinder, the lead screw will be able to go up and down thereby creating some movement. It is this linear motion that is needed in some applications such as in
I. Robotic movement such as robot’s fingers and arms motion
II. Calculating and computing such as in hard disk drive.
On the other hand, a servo linear device or actuator can be described in two ways; the servo motor as well as the control circuit. A servo motor will have;
1. The DC motor.
2. A potentiometer, which can be a resistor that have either two or three terminals. When the terminals are two, the potentiometer becomes a rheostat. However, the three-terminal potentiometer acts like a voltage divider.
The control circuit as well as the servo motor of a typical servo linear actuator will have different gears attached to them. The potentiometer alters its resistance as the motor works thereby making the circuit to control the used energy of the motor and its output as well. To get more information visit #Servo Linear actuator.
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