servo motor and servo drive

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Servo motor

Servo motor & driveSai kumar

Servo motorAservomotoris a rotary actuator or linear actuator that allows for precise control of angular or linear position, velocity and acceleration. Essentially, it consists of an electric motor, feedback device,electronic controller.

Cont..,Motors can be either AC or DCCan be of 1 phase or 3 phase.DC motors can be brushed or brushless.Brushless DC motors are more expensive, drives are more complex, but are more reliable and maintenance free.Feedback device for servomotors is typically an encoder or resolver built into the motor frame.Control circuitry is a motion controller (generates motion) and a drive to supply power to the motor

Types of servo motorsAC servo motor

Dc servo motor

Continuous rotation servo motor

Linear servo motor

Layout of servo mechanism Servo drivePLC (transistor type)Servo motorPowersourcecontactorLoad

Controlling a Servo MotorPosition control using Pulse Width Modulation Technique. The width of the pulse applied to the motor is varied and send for a fixed amount of time.The pulse width determines the angular position of the servo motor. For example a pulse width of 1 ms -a angular position of 0 degrees, a pulse width of 2 ms - a angular width of 180 degrees.

Servo driveElectronic amplifierused to power electricservomechanisms.A servo drive monitors thefeedbacksignal from the servomechanism and continually adjusts for deviation from expected behaviour.

Servo features linear relationship b/n speed and electric control signalSteady state stabilityWide range of speed controlLow mechanical and electrical inertiaFast response

Typical application

ApplicationsRoboticsConveyor beltsCamera auto focusRobotic vehiclesSolar tracking systemCNC machinesAntenna positioningMetal cutting & metal forming m/c millimg m/c, lathe, grinding, pressing, punching, bending in metal fabrication.TextilesPrintersAutomatic door openers

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