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EE2253 Control Systems (Units 1 , 2 and 3) Scanned Lecture Notes - Thangasamy Edition
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Anna University , Chennai
Department of B.E-Electrical and Electronics Engg
Fourth Semester
EE2253 Control Systems
Units 1 , 2 and 3
Scanned Lecture Notes
(Regulation 2008) 

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Syllabus : 
UNIT 1 : INTRODUCTION

UNIT 2 : TIME RESPONSE ANALYSIS

UNIT 3 : FREQUENCY RESPONSE

Content :
CONTROL SYSTEM

Classification of control system
1. Depends upon the structure
2. Depends upon the mathematical model
3. Depends upon the response
4. Depending upon the hardware components used
5. Depending upon the data type
6. Depending upon the method control used
7. Depending upon the no of variables
Open loop system
Closed loop system
Comparison of open and closed loop
Modelling of the system
1. State space model
2. Impulse response model
Transfer function
Properties of transfer function
Poles of a function
Zero’s of the function
Characteristics equation of the system
Order of the function
Electrical analogy of mechanical system
Classification
1. Mechanical transulation system
2. Mechanical rotational system
Mechanical translation system
a. Mass
b. Spring
c. Dash pot
Concept of force
Transulation system
Mechanical rotational system
Electrical analogy of mechanical translational system
Force voltage analogy
Block diagram representation
Properties
Block diagram reduction algebra
SIGNAL FLOW GRAPH
Path
Input node
Path gain
Signal flow graph reduction
Mason’s gain formula
Procedure
Synchros
Sychro transmitter
Construction
Major parts
1. Stator
2. Rotor
Synchro’s control transformer
DC servomotor 
Permanent magnet motor
Advantages
Disadvantages
Electro-magnetic field motor
AC servomotor
Working principle

UNIT-2

TIME RESPONSE ANALYSIS
Transient steady state
Closed loop transfer function
Test signal
1. Step signal
2. Ramp signal
3. Parabolic signal
4. Impulse signal
Order of the system
Types of the system
Time response of the second order system
Time domain specification
1. Delay time
2. Rise time
3. Peak time
4. Peak over shoot
5. Setting time
Type number of control system
Steady state error
Generalized error co-eficient
Evaluation of generalized error co-efficient
P , PI , PID modes of feed back controller
Error compensation
Effects of PI controller
Loop transfer function
Effects of PID controller

UNIT-3
FREQUENCY RESPONSE
Advantages of frequency response method
Graphical methods
Bode plot
Nyquist plot
Nichols chart
Frequency response
Frequency domain specification
1. Resonant peak
2. Resonant frequency
3. Band width
4. Cut off rate
5. Gain margin
6. Phase margin
Basic factors
1. Consant gain
2. Integral factor
3. Derivative factor
4. First order factor in denominator
Steps for plotting the magnitude plot
Procedure for phase plot of bode plot
Typical sketch of polar plots

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