Download Al-Balqa` Applied University Faculty of Engineering Technology

Al-Balqa' Applied University
Faculty of Engineering Technology
Mechatronics Engineering Department
Electric Drive Laboratory
Experiment Two
Investigation of three phase wound rotor induction motor natural and
regulated characteristics
Student’s Name:
Supervisor:
Date:
Three- Phase Wound Rotor Induction Motor Workbench
Part I
Experiment Objectives:
1- Studying and identifying the workbench components.
2- Measuring stator windings and rotor windings resistances.
3- Investigation of motor electro-mechanical and torque-speed natural characteristics for star
and delta connections of stator windings.
Experiment procedures carrying out:
1-Studying and identifying the workbench components
A- Plot the experiment block-diagram or schematic diagram showing the main components
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B- Write down the specifications and parameters of each component
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2-Measuring stator windings and rotor windings resistances
A- Using Ohmmeter
Rs 
Rr 
B- Using Volt- Ampere Method
1- Measuring stator winding resistance using regulated dc source.
Plot electrical circuit
Apply suitable values of dc source voltages depending on the measured stator resistance value and fill the
following table.
V, Volt
I, Ampere
R s ,Ohm
Average stator resistance =
2- Measuring rotor winding resistance using regulated dc source.
Plot electrical circuit
Apply suitable values of dc source voltages depending on the measured stator resistance value and fill the
following table.
V, Volt
I, Ampere
R r ,Ohm
Average rotor resistance =
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3- Investigation of motor electro-mechanical and torque-speed natural characteristics for
star and delta connections of stator windings
A- Plot the experiment electrical power circuit showing measuring devices for stator windings star
connection.
B- Experiment steps:
1-Connect the motor electrical power circuit
2- Set the stator windings voltage to nominal value, V1LN  400V
3- Set the rotor windings added resistance to zero, R 2ad 0 
4- For different values of load torque fill the following table:
Star connection of stator windings
V1LN  400V ,
R 2ad 0 
TL , N.m
n, rpm
I1 , A
I 2/ , A
C- Plot the experiment electrical power circuit showing measuring devices for delta windings star
connection.
D- Experiment steps:
1-Connect the motor electrical power circuit
2- Set the stator windings voltage to nominal value, V1LN  230V
3- Set the rotor windings added resistance to zero, R 2ad 0 
4- For different values of load torque fill the following table:
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Delta connection of stator windings
V1LN  230V
,
R 2ad 0 
TL , N.m
n, rpm
I1 , A
I 2/ , A
E- Plot star and delta natural electro-mechanical characteristics n
natural torque- speed (mechanical) characteristics.
F-Results and Conclusions
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=
f (I 2/ ) and plot star and delta
Part II
Experiment Objectives:
Investigation of motor electro-mechanical and torque-speed regulated characteristics for star
connection of stator windings by:
1- Adding Resistances in rotor circuit.
2- Varying stator voltage using autotransformer.
Experiment procedures carrying out:
1- Investigation of motor electro-mechanical and torque-speed regulated characteristics
by adding resistances in rotor circuit.
A- Plot the experiment electrical power circuit showing measuring devices
B- Experiment steps:
1-Connect the motor electrical power circuit
2- Set the stator windings voltage to nominal value, V1LN  400 V
3- For each value of rotor added resistance under different load torque values fill the following tables:
Star connection of stator windings
V1LN  400V , R 2ad 0 
TL , N.m
n, rpm
I1 , A
I 2/ , A
Star connection of stator windings
V1LN  400V ,
TL , N.m
n, rpm
I1 , A
I 2/ , A
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R 2ad

Star connection of stator windings
V1LN  400V ,
R 2ad

TL , N.m
n, rpm
I1 , A
I 2/ , A
C- Plot regulated electro-mechanical characteristics related to natural characteristic and plot regulated
torque- speed (mechanical) characteristics related to natural characteristic.
D- Results and Conclusions
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2- Investigation of motor electro-mechanical and torque-speed regulated characteristics
varying stator voltage using autotransformer.
A- Plot the experiment electrical power circuit showing measuring devices
B- Experiment steps:
1-Connect the motor electrical power circuit
2- Set the stator windings voltage to nominal value, V1LN  400 V
3- For each value of stator windings phase voltage under different load torque values fill the following tables:
Star connection of stator windings
V1N  230 V , R 2ad 0 
TL , N.m
n, rpm
I1 , A
I 2/ , A
Star connection of stator windings
V1N  180 V ,

R 2ad
TL , N.m
n, rpm
I1 , A
I 2/ , A
Star connection of stator windings
V1N  120 V ,
TL , N.m
n, rpm
I1 , A
I 2/ , A
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R 2ad

C- Plot regulated electro-mechanical characteristics related to natural characteristic and plot regulated
torque- speed (mechanical) characteristics related to natural characteristic.
D- Results and Conclusions
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