Motor which provides power to a servomechanism

After the device achieves its desired output, there will be no longer logical difference between reference input signal and reference output signal of the system. Then, third signal produced by comparing theses above said signals will not remain enough to operate the device further and to produce further output of the system until the next reference input signal or command signal is applied to the system.

Hence the primary task of a servomechanism is to maintain the output of a system at the desired value in the presence of disturbances. Now we will discuss Servo Motor. Thus any motor controlled using Servo Mechanism is Servo Motor. Servos are extremely useful in robotics. The motors are small and are extremely powerful for their size. The shaft of the DC motor is coupled with another shaft called output shaft, with help of gear assembly.

The voltage adjusting knob of a potentiometer is so arranged with the output shaft by means of another gear assembly, that during rotation of the shaft, the knob also rotates and creates an varying electrical potential according to the principle of potentiometer. This signal i. This electrical potential or voltage is taken to the error detector feedback amplifier along with the input reference commends i.

The control unit then generates a signal which implies the amplified error signal that controls the voltage provided to the motor. The voltage level of the error signal provided to the motor now changes its position. In this way, the desired position of the motor is achieved with high precision using feedback potentiometer.

The major classification of the servomotor is done on the basis of the type of supply applied to it for its operation. This is so because the positioning of the motor is controlled with the input electrical signal which is either analog or digital in nature. Thus, it is classified as:. AC Servomotor : The type of servomotor that uses AC electrical input for providing a mechanical positional output is known as AC servomotor.

DC Servomotor : When the applied input to the motor is DC in nature then that configuration of the servomotor is known as DC servomotor. Servomotor finds applications in several industrial and commercial system. The applications of servomotor are as follows:.

Your email address will not be published. Save my name, email, and website in this browser for the next time I comment. A common type of servo provides position control. Servos are commonly electrical or partially electronic in nature, using an electric motor as the primary means of creating mechanical force.

Other types of servos use hydraulics, pneumatics, or magnetic principles. Positioning servomechanisms were first used in military fire-control and marine navigation equipment. Today servomechanisms are used in automatic machine tools, satellite-tracking antennas, remote control airplanes, automatic navigation systems on boats and planes, and antiaircraft-gun control systems.

Other examples are fly-by-wire systems in aircraft which use servos to actuate the aircraft's control surfaces, and radio-controlled models which use RC servos for the same purpose.

Many autofocus cameras also use a servomechanism to accurately move the lens, and thus adjust the focus. The size and shape of the servo motors are dependent on the application.

RC servo motor are the common type of servo motors used in robotics and hobby applications due to their affordability, reliability, and simplicity of control by microprocessors. RC servo motors are low power servos that can be powered from small batteries and other DC supplies in the range of mA to 2 A.

There are also high power servo motor types which are powered from AC supplies and used in industrial applications. Servo motors are geared DC motors with the closed-loop circuitry incorporated within them.

The basic configuration of a servo motor composed of a DC motor, gearbox, potentiometer and control circuit. DC motor is used to move a gearbox with a large reduction ratio.