Servo Amplifier(Servo drive)

Presented by13me80 Khan Fahad13me81 Khan Gulfam

Prof incharge : Arshad Qureshi

IntroductionServo Amplifier / Servo DriveA servo drive is a special electronic amplifier used to power electric servomechanisms.

A servo drive monitors the feedback signal from the servomechanism and continually adjusts for deviation from expected behavior

History of Motor Types in Servo Drives

ECbrushlessDC

SMsynchronousmotor

ASMasynchronousmotor

SM SM

ASM

DC

1970 ff. 1980 ff. 1990 ff.

FunctionLet’s start with its Functions

1

“

A servo drive receives a command signal from a control system, amplifies the signal, and transmits electric current to a servo motor in order to produce motion proportional to the command signal.

Use in industry

Servo systems can be used in◦ CNC machining◦factory automation◦Robotics

Their main advantage over traditional DC or AC motors is the addition of motor feedback.

Advanced Motion Control

brushless servo amplifier with armature connection

Motors synchronous motors with

surface mounted

permanent magnets as a

standard

different solutions in

special applications only

Future Developments

Signal Processingfurther developments on

speed/position encoders

to be expected

Sensorless/encoderless

control only, if

ENCODERS ◦ Advantages• low cost• high accuracy◦ (e. g. by gear ratio)

Disadvantages• elastic effects

and back lash

AC Servos

High Speed Spindle(Siemens)

DSD Servo (Baumüller)

High Torque Motor (Baumüller)

Spindle Motor (Franz Kessler)

-

Feldschwächung

- -

-

M-Regler Strom-Regler

Feld-Regler

Ma-schinen-modell

ej

e-j

e-j

M3~

i

u

Encoder

n* i*q

i*d*

for asynchronousmachines

field weakening field controller

speedcontroller

currentcontrollers

machine

model

for synchronousmachines

AC Servo Drive Control

feed

drives

axis

Spindle

drives

main

high efficiency

small size

smooth operationat low speeds

4 quadrant operation

high maximum torque

constant maximum torque

speed range < 10.000 rpm

rated power < 20 kW

Characteristics of Servo Drives

high rated/continuous torque

constant maximum power

speed range < 20.000 rpm

rated power < 100 kW

Thanks!ANY QUESTIONS?