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ELECTRICAL MACHINES IIEPMN304
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Course Grading System
Marks
Final Exam Semester Work- 20 Mid-term- 15 Quizzes
- 15 Assignments- 10 Labs
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Course Schedule
Lecture: Monday 4 – 6 pm (20104) Tutorial: Thursday 4 - 7 pm (20322) Office Hours: Tuesday & Wednesday 11-12 Quizzes: W3–W5–W7–W11–W13 Assignments: W4 – W6 Labs: W8 – W10- W12 Mid-term: W9 Email: [email protected] Scholar Page: https://goo.gl/JDVOPR
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Course ILOs
1. Explain the magnetic field distribution and voltage induction in induction and synchronous machines.
2. Describe the theory of operation of induction machines.3. Calculate the induction motors performance characteristics using the
equivalent circuit model. 4. Analyze the effect of changing different parameters of the induction
motor on its performance and design. 5. Experiment induction machines to calculate the equivalent circuit
parameters and examine its performance.6. Discuss the theory of operation of synchronous machines.7. Apply the exact phasor diagram and the equivalent circuit models of
the synchronous machines. 8. Differentiate between the synchronous generator performance at
stand-alone and grid-connected conditions.9. Analyze the performance and applications of synchronous motors.10. Experiment synchronous generator to determine the different machine
characteristics.
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Course Contents
AC Machines Fundamentals Three-phase Induction Motors1. Principle of operation.2. Equivalent circuit and power flow.3. Torque-speed characteristics.4. Starting. 5. Testing.
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Course Contents
Single-phase Induction Motor Synchronous Generators1. Construction and types.2. Operation of stand-alone generators.3. Parallel operation.4. Testing
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Course References
A.E. Fitzgerald & Charles Kingsley, Electric Machinery, 7th Edition.
Stephan J. Chapman, Electric Machinery Fundamentals, 5th Edition.
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Introduction: Ampere’s Law
. . enc S
H dl J dS I
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Introduction: Magnetic Circuits
NI
NI
mclA
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Introduction: Faraday’s Law
demfdt
N .S
B dS
2
211
.e v B dl
e Blv
-
+
ru
u
zu
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Introduction: Force & Torque
mF I dl B
mF BIL
T Fr
mP T ru
u
zu
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Introduction: 3-ph AC Circuits
3 L LS V I P jQ
3S V I
3 cosL LP V I
3 sinL LQ V I
LV V
3LVV
LI I
3LII
3 cosP V I
3 sinQ V I
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Introduction: Electrical Motors13
Fundamentals of AC Machines
AC Machines is classified into two main categories:1. Induction Machines: Three-phase induction motor. Single-phase induction motors. Three-phase induction generator. Two-phase induction motor (AC Servo-Motor). AC Tacho-generator
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Fundamentals of AC Machines
AC Machines is classified into two main categories:2. Synchronous Machines: Three-phase synchronous generator. Three-phase synchronous motor. Synchronous reluctance motor. Stepper motors. Brushless DC motor.
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Introduction: Synchronous Generator16
Fundamentals of AC Machines
Magnetic Field Production and Distribution- DC Machines- Synchronous Machines- Induction Machines
Generated (induced) Voltages- Synchronous Machines- Induction Machines
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Magnetic Field Production & Distribution
NS
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Magnetic Field Production & Distribution
Salient Poles
N
S
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Magnetic Field Production & Distribution
Salient Poles
N
S
. enc
H dl I
. 2 f fc
H dl N I
fN
g g 2 f fH H N I
Neglecting the reluctance of the steel parts
gg f fH N I MMF g
fo
BM g
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Magnetic Field Production & Distribution
Salient Poles
N
S
fM
N S
N
S
f fN I
fI
fM
fI
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Magnetic Field Production & Distribution
Salient Poles
N
S
N
S
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Magnetic Field Production & Distribution
Salient Poles
fM
N S
N
S
f fN I
fI
fM
N
S
N
S
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Magnetic Field Production & Distribution
Non-salient poles
N
S
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Magnetic Field Production & Distribution
Non-salient poles
N
S
. enc
H dl I
. f fc
H dl N I
Neglecting the reluctance of the steel parts
g2f f
gN IH MMF
gf
o
BM g
g g f fH H N I
fN
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Magnetic Field Production & Distribution
Non-salient poles
N
SNSS
fM
2f fN I
2f fN Ip
1,3,5,..
4( ) cos( )n
Ff nn
1,3,5,..
4 1( ) cos( )2
f f
h
N IM h
p h
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Magnetic Field Production & Distribution
Non-salient poles
N
S
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Magnetic Field Production & Distribution
Non-salient poles
N
S
. enc
H dl I
. f fc
H dl N I
Neglecting the reluctance of the steel parts
g2f f
gN IH MMF
gf
o
BM g
g g f fH H N I
fN
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Magnetic Field Production & Distribution
Non-salient poles
N
S
N
SS
fM
2f fN I
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Magnetic Field Production & Distribution
Non-salient poles
N
S
N
SS
fM
2f fN I
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Magnetic Field Production & Distribution
Non-salient poles
1,3,5,..
4 1( ) cos( )2
f fd
n
N IM k h
p h
dvector sumk
arithmatic sum
1,3,5,..
4 1( ) cos( )2
f f
h
N IM h
p h
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Magnetic Field Production & Distribution
Space Harmonics
N
SS
fM1M
3M
N
S SS
1 3 5cos cos3 cos5 ...fM M M M
gf
o
BM g
fg o
MBg
1 3 5cos cos3 cos5 ...gB B B B
N NN
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Magnetic Field Production & Distribution
Space Harmonics
1 3 5cos cos3 cos5 ...fM M M M
1 3 5cos cos3 cos5 ...gB B B B
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