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1
Dr. Imtiaz HussainAssistant Professor
email: [email protected] :http://imtiazhussainkalwar.weebly.com/
Introduction to Modular Servo System
Lab-4:Development of characteristics of D.C Motor
Lab-5: Formation of Error Channel
Lab-6:Experimental Determination of Transfer function
Modern Control Systems (Pr)
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Outline
• Introduction to MS150 • Experiment#4
– Speed Voltage characteristics of D.C Motor• Experiment#5
– Formation of Error channel• Experiment#6
– Experimental Determination of Mathematical Model (System Identification)
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Modular Servo System (MS150)
• Operation Amplifier Unit (OU150A)
• Attenuator Unit (AU150B)
• Pre-amplifier Unit (PA150C)
• Servo Amplifier (SA150D)
• Power Supply (PS150E)
• Motor-Tacho Unit (MT150F)
• Input potentiometer (IP150H)
• Output Potentiometer (OP150K)
• Load Unit (LU150L)
• The MS150 Modular Servo System is a unique equipment designed to study the theory and practice of automatic control systems.
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Modular Servo System (MS150)
• Power Supply (PS150E)
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Modular Servo System (MS150)
• Servo Amplifier (SA150D)
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Modular Servo System (MS150)
• Motor-Tacho Unit (MT150F)
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Modular Servo System (MS150)
• Operation Amplifier Unit (OU150A)
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Modular Servo System (MS150)
• Pre-amplifier Unit (PA150C)
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Modular Servo System (MS150)
• Attenuator Unit (AU150B)
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Modular Servo System (MS150)
• Input potentiometer (IP150H)
• Output Potentiometer (OP150K)
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Modular Servo System (MS150)
• Load Unit (LU150L)
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Experiment#4
Development of characteristics of D.C Motor
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Characteristics of D.C Motor• Motor Characteristics (Armature control Mode)
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Characteristics of D.C Motor• Motor Characteristics (Field control Mode)
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Characteristics of D.C Motor
+15
com
Experimental set up (Armature Control Mode)
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Characteristics of D.C Motor• Connect the voltmeter across the tacho outputs and switch on the
power.
• Turn the slider on the potentiometer till there is a reading of 1V on the voltmeter.
• Count the turns of the geared 30:1 low speed shaft in one minute.
• Tabulate your result in following table.S. No Tachogenerator
Volts (Vg)Vin No. of rotations
of low Speed Shaft (a)
Speed in rev/min N=30×a
1 1
2 2
3 3
4 4
5 5
6 7
7 10
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Characteristics of D.C Motor
• Plot the graph of your results, as in following figure, of speed against Tachogenerator volts. The calibration factor should be about 2.5V to 3V per 1000 rev/min.
calibration factor =
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Experiment#5
Error Channel
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Error Channel
PlantControllerr ce
-
cre
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Error ChannelClosed Loop Position Control System
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Error Channel
PlantControllere
oie
-
• In a closed loop position control system reference input and output are angular positions.
i o
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Position Control System (Block Diagram)
AttenuatorSumming amplifier Pre-Amp Servo-
Amp
I/PPotentio-
meterD.C
Motor
O/PPotentio-
meter
i
o
ooV
)( 21 VVAVo
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Calibration
• Before connecting the two sliders into the operational amplifier inputs make certain that the slider resistance is same on both input and output potentiometers for all angular positions.
• If not, then loosen the dial and make an adjustment.
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Readings
S.No
Input potentiometer
Output potentiometer V1- V2 Vo(Measured)
V1 V2oi
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Experiment#6
Experimental Determination of Transfer Function
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Practical Determination of Transfer Function of 1st Order Systems
• Often it is not possible or practical to obtain a system's transfer function analytically.
• Perhaps the system is closed, and the component parts are not easily identifiable.
• The system's step response can lead to a representation even though the inner construction is not known.
• With a step input, we can measure the time constant and the steady-state value, from which the transfer function can be calculated.
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Practical Determination of Transfer Function of 1st Order Systems
• If we can identify T and K from laboratory testing we can obtain the transfer function of the system.
1Ts
K
sR
sC
)()(
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First Order System With Delays
0 5 10 15
0
2
4
6
8
10
Step Response
Time (sec)
Am
plit
ude
dt T
dsteTs
K
sR
sC
1)()(
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• Armature Controlled D.C Motor (La=0)
abt
abt
at
RKKB
JTand
RKKB
RKKwhere
Ts
K
U(s)
Ω(s)
1 u
ia T
Ra La
J
B
eb
V f=constant
Determination of Transfer Function of Armature Controlled D.C Motor
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Step Response of D.C Motor• Apply square wave of amplitude 10 volts and frequency 0.1Hz.
ArmatureControlledD.C Motor
10
-10
0
v
t5 10 15
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Experimental Setup
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END OF LAB-4-5-6
To download this lecture visithttp://imtiazhussainkalwar.weebly.com/