electrical machines ii - scholar.cu.edu.eg induction and synchronous machines. 2. describe the...

ELECTRICAL MACHINES IIEPMN304

1

Course Grading System

Marks

Final Exam Semester Work- 20 Mid-term- 15 Quizzes

- 15 Assignments- 10 Labs

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Course Schedule

Lecture: Sunday 9 - 11 am (20424) Tutorial: Monday 2 - 5 pm (9301) Office Hours: Tuesday & Wednesday 11-12 Quizzes: W3–W5–W7–W11–W13 Assignments: W4 – W6 Labs: W8 – W10- W12 Mid-term: W9 Email: tamer.m.abdo@gmail.com 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

8

Introduction: Magnetic Circuits

NI

NI

mclA

9

Introduction: Faraday’s Law

demfdt

N .S

B dS

2

211

.e v B dl

e Blv

-

+

ru

u

zu

10

Introduction: Force & Torque

mF I dl B

mF BIL

T Fr

mP T ru

u

zu

11

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

Introduction: Synchronous Generator14

Introduction: Induction Motor15

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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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

22

Magnetic Field Production & Distribution

Salient Poles

N

S

N

S

23

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

25

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

30

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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