A servo amplifier is an electronic amplifier used to power electric servomechanisms. It monitors feedback from the servomechanism and adjusts for deviations from expected behavior. Servo drives have historically used different motor types including DC, brushless DC, synchronous, and asynchronous motors. A servo drive receives a command signal, amplifies it, and transmits current to a servo motor to produce proportional motion. Servo systems are used in CNC machining, factory automation, and robotics due to the addition of motor feedback over traditional motors.

1. Servo Amplifier
(Servo drive)
Presented by
13me80 Khan Fahad
13me81 Khan Gulfam
Prof incharge : Arshad Qureshi

2. Introduction
Servo Amplifier / Servo Drive
A 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

3. History of Motor Types in Servo Drives
EC
brushless
DC
SM
synchronous
motor
ASM
asynchronous
motor
SM SM
ASM
DC
1970 ff. 1980 ff. 1990 ff.

4. Function
Let’s start with its Functions
1

5. “
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.

6. 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.

7. Advanced
Motion Control
brushless servo amplifier with armature connection

8. Motors
synchronous motors with
surface mounted
permanent magnets as a
standard
different solutions in
special applications only
Future Developments
Signal Processing
further developments on
speed/position encoders
to be expected
Sensorless/encoderless
control only, if

9. ENCODERS
◦Advantages
• low cost
• high accuracy
◦ (e. g. by gear ratio)
Disadvantages
• elastic effects
and back lash

10. AC Servos
High Speed Spindle
(Siemens)

11. DSD Servo
(Baumüller)

12. High Torque Motor
(Baumüller)

13. Spindle Motor
(Franz Kessler)

14. -
Feldschwächung
- -
-
M-Regler Strom-
Regler
Feld-Regler
Ma-
schinen-
modell
ej
e-j
e-j
M
3~
i
u
Encoder
n* i*q
i*d*


for asynchronous
machines
field weakening field controller
speed
controller
current
controllers
machine
model
for synchronous
machines
AC Servo Drive Control

15. feed
drives
axis
Spindle
drives
main
high efficiency
small size
smooth operation
at 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

16. Thanks!
ANY QUESTIONS?