Servo Configuration - YASKAWA SGM-A3 User Manual

1.1.2 Servo Configuration

1) Configuration of Servo System
The following diagram illustrates a servo system in detail:
Position or
speed
reference
(1) Controlled system: Mechanical system for which the position or speed is to be con-
(2) Servomotor:
(3) Detector:
(4) Servo amplifier:
(5) Host controller:
Comparator Power
amplifier
(Input)
Position or
speed
feedback
(3)
Detector Servomotor
trolled.
This includes a drive system that transmits torque from a servo-
motor.
A main actuator that moves a controlled system. Two types are
available: AC servomotor and DC servomotor.
A position or speed detector. Normally, an encoder mounted on
a motor is used as a position detector.
An amplifier that processes an error signal to correct the differ-
ence between a reference and feedback data and operates the
servomotor accordingly. A servo amplifier consists of a
comparator, which processes error signals, and a power ampli-
fier, which operates the servomotor.
A device that controls a servo amplifier by specifying a position
or speed as a set point.
1.1 Basic Understanding of AC Servos
Host controller
(5)
Servo amplifier
(4)
(Output)
Motor
drive
circuit
(1)
Gear
(2)
Controlled
system
Drive system
1
Position
Speed
Movable
table
Ball screw
5