YASKAWA SMG Series User Manual

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YASKAWA SMG Series User Manual Manual pdf 12 page image

1.2 Servo Configuration51.2 Servo ConfigurationThe following diagram illustrates a servo system in detail:Position orspeedreferenceHost controllerServo amplifierComparator Poweramplifier(Input)Motordrivecircuit(Output)PositionSpeedGear MovabletablePosition orspeedfeedbackControlledsystemBall screwDetector servomotor Drive system(1)(2)(3)(4)(5)(1) Controlled system: Mechanical system for which the position or speed is to be con-trolled.This includes a drive system that transmits torque from a servo-motor.(2) Servomotor: A main actuator that moves a controlled system. Two types areavailable: AC servomotor and DC servomotor.(3) Detector: A position or speed detector. Normally, an encoder mounted ona motor is used as a position detector.(4) Servo amplifier: An amplifier that processes an error signal to correct the differ-ence between a reference and feedback data and operates theservomotor accordingly. A servo amplifier consists of acomparator, which processes error signals, and a power ampli-fier, which operates the servomotor.(5) Host controller: A device that controls a servo amplifier by specifying a positionor speed as a set point.1