Gokaraju Rangaraju Institute of Engineering and Technology (Autonomous) Bachupally, Kukatpally, Hyderabad – 500 090, A.P, India (040) 6686 4440 Department of Electrical and Electronics AC MACHINES Course By VVS Madhuri INDEX S.No Contents 1 Vision and mission of the department 2 Course Objectives 3 Course Outcomes 4 Mappings 5 Course Hand out 6 Academic calender 7 Subject Allocation sheet 8 Class Time table 9 Syllabus copy 10 Lecture Notes 11 Tutorial sheets 12 Assignment sheets 13 Sessional question papers 14 Best ,average and weak answer scripts 15 Result Analysis 16 Feed back from students 17 CO attainment from all mids
Transcript
Gokaraju Rangaraju Institute of Engineering and Technology (Autonomous)
1 Vision and mission of the department 2 Course Objectives 3 Course Outcomes 4 Mappings 5 Course Hand out 6 Academic calender 7 Subject Allocation sheet 8 Class Time table 9 Syllabus copy
10 Lecture Notes 11 Tutorial sheets 12 Assignment sheets 13 Sessional question papers 14 Best ,average and weak answer scripts 15 Result Analysis 16 Feed back from students 17 CO attainment from all mids
Gokaraju Rangaraju Institute of Engineering and
Technology
(Autonomous)
Department/Program-EEE
MISSION OF THE INSTITUTE:
To achieve and impart quality education with an emphasis on practical skills and social relevance.
VISION OF THE INSTITUTE:
To be among the best of the institutions for engineers and technologists with attitudes, skills and knowledge and to become an epicenter of creative solutions. VISION OF THE DEPARTMENT: To impart technical knowledge and skills required to succeed in life , career and help society to achieve self sufficiency.
MISSION OF THE DEPARTMENT:
• To become an internationally leading department for higher learning.
• To build upon the culture and values of universal science and contemporary education. • To be a center of research and education generating knowledge and technologies which lay
groundwork in shaping the future in the fields of electrical and electronics engineering.
• To develop partnership with industrial, R&D and government agencies and actively participate in conferences, technical and community activities.
Gokaaju Rangaraju Institute of Engineering and Technology (Autonomous)
Bachupally, Kukatpally, Hyderabad – 500 090, A.P., India. (040) 6686 4440 GRIET/DAA/1H/G/18-19 05 May 2018
ACADEMIC CALENDAR Academic Year 2018-19
II B.TECH – FIRST SEMESTER
S. No. EVENT PERIOD DURATION
1 1st Spell of Instructions 02-07-2018 to 01-09-2018 9 Weeks
2 1st Mid-term Examinations 03-09-2018 to 05-09-2018 3 Days 3 2nd Spell of Instructions 06-09-2018 to 24-10-2018 7 Weeks
4 2nd Mid-term Examinations 25-10-2018 to 27-10-2018 3 Days
5 Preparation 29-10-2018 to 06-11-2018 1 Week 3 Days
6 End Semester Examinations (Theory/
Practicals) Regular/Supplementary 08-11-2018 to 08-12-2018 4 Weeks 3 Days
7 Commencement of Second Semester, A.Y 2018-19
10-12-2018
II B.TECH – SECOND SEMESTER S. No. EVENT PERIOD DURATION
1 1st Spell of Instruction 10-12-2018 to 02-02-2019 8 Weeks
2 1st Mid-term Examinations 04-02-2019 to 06-02-2019 3 Days
3 2nd Spell of Instruction 07-02-2019 to 06-04-2019 8 Weeks 3 Days
4 2nd Mid-term Examinations 08-04-2019 to 10-04-2019 3 Days
5 Preparation 11-04-2019 to 17-04-2019 1 Week
6 End Semester Examinations (Theory/
Practicals) Regular 18-04-2019 to 08-05-2019 3 Weeks
7 Supplementary and Summer Vacation 09-05-2019 to 22-06-2019 6 Weeks 3 Days 8 Commencement of First Semester,
A.Y 2019-20
24-06-2019
Copy to Director, Principal, Vice Principal, DOA, DOE, Balaji Kumar, DCGC, All HODs
SUBJECT ALLOCATION SHEET
2018-19 II sem Subject Allocation sheet
GRIET/EEE/05B/G/18-19 30.10.18
II YEAR(GR17) Section-A Section-B
Managerial Economics and Financial Analysis
Power Generation and Distrubution SN SN
AC Machines VVSM VVSM
Control Systems Dr DGP MS
Princeples of Digital Electronics PRK PRK
AC Machines Lab PPK/DSR PPK/DSR
Control Systems Lab MS/PSVD MS/PSVD
Analog and Digital Electronics Lab RAK/DKK RAK/DKK
Value Education and Ethics
Gender Sensitization Lab MS/PSVD MS/PSVD
III YEAR (GR15)
Computer Methods in Power systems VVRR/MP VVRR/MP
Switch Gear & Protection PSVD Dr JSD
Management Science
Utilization of Electrical Energy MRE MRE Non Conventional Sources of Energy Neural and Fuzzy Systems
Sensors&Transducers UVL UVL
Power Systems Lab GSR/YSV GSR/YSV
Advanced English Communications Skills Lab
Industry Oriented Mini Project Lab PPK/AVK/Dr JP MP/Dr JP
IV YEAR (GR15)
Programmable Logic Controllers PK
Flexible AC Transmission Systems Dr TSK
EHV AC Transmission
Power System Automation
Modern Power Electronics AVK
DSP Based Electromechanical Systems
Advaced Control Systems
Programmable Logic Controllers-Lab VVSM PK
Main Projects
RAK/Dr SVJK PK/VVRR
COURSE OBJECTIVES
Academic Year : 2018-19
Semester : II
Name of the Program: B.Tech …EEE… Year: …II….. Section: A / B
Polyphase induction motors-construction details of cage and wound rotor machines-production of a
rotating magnetic field - principle of operation - rotor emf and rotor frequency - rotor reactance, rotor
current and pf at standstill and during operation
UNIT II: Characteristics of Induction Motors Characteristics of Induction Motors: Rotor power input, rotor copper loss and mechanical power
developed and their inter relation-torque equation-deduction from torque equation - expressions for
maximum torque and starting torque - torque slip characteristic - equivalent circuit - phasor diagram
- crawling and cogging.Noload Test and Blocked rotor test –Predetermination of performance-
Methods of starting and starting current and Torque calculations Speed Control Methods: Speed control-change of voltage, change of frequency,V/f ; injection of an
emf into rotor circuit (qualitative treatment only)-induction generator-principle of operation.
UNIT III: Construction, Principle of operation, Characteristics & Regulation of Synchronous Generator:
Construction, Principle of operation, Characteristics & Regulation of Synchronous Generator
Constructional Features of round rotor and salient pole machines – Armature windings – Integral slot
and fractional slot windings; Distributed and concentrated windings – distribution, pitch and winding
characteristics Regulation by synchronous impedance method, M.M.F. method, Z.P.F. method and A.S.A. methods – salient pole alternators – two reaction analysis – experimental determination of Xd and Xq (Slip
test) Phasor diagrams – Regulation of salient pole alternators.
UNIT IV: Parallel Operation of Synchronous Generator Parallel Operation of Synchronous Generator: Synchronizing alternators with infinite bus bars – synchronizing power torque – parallel operation and load sharing - Effect of change of excitation and
mechanical power input. Analysis of short circuit current wave form – determination of sub-transient,
transient and steady state reactance’s.
Synchronous Motors – Principle of Operation: Theory of operation – phasor diagram – Variation of
current and power factor with excitation – synchronous condenser – Mathematical analysis for power
developed .- hunting and its suppression – Methods of starting – synchronous induction motor.
UNIT V: Single Phase Motors & Special Motors Single phase Motors: Single phase induction motor – Constructional features-Double revolving field
theory – split-phase motors – shaded pole motor.
Gokaraju Rangaraju Institute of Engineering and Technology
details of slip ring and D-page 243- 3. salient pole rotors
249
Synchronous speed RMF 3 4
principle of operation of
2
induction motor and how D-page 301- 4. does a rotor rotate
305
Slip speed slip frequency 2 4
5
2 generalized transformer A-page 711
theory constant RMF
Derivation
Stator resistance, 2 3 4
reactance, stator applied
voltage stator current
2
rotor induced emf rotor D-page 477- 6. reactance resistance in
478
relation to slip.
Torque and power 1 4
2 1 starting torque, equation D-page 715-
2 condition for max torque
716
Starting torque of squirrel 2 3
cage IM, starting torque
of slip ring motor power
2 2 D- page 729
Derivation
Motor input to stator, 3 4
stator cu loss, Iron losses,
rotor input power rotor
cu loss, mechanical
power developed in rotor
3 2 Page 729
friction and windage
losses and rotor output
Effect of change in supply 4
voltage on Tst effect of
change in supply voltage
in supply voltage on
. 4 2 torque and slip full load
B-page 730 torque and condition for
max torque, relation
between Tst and Tmax.
Performance 1 2 4
characteristics of
induction motors, speed
5 2
vs output power factor vs B-page 727-
output efficiency vs 728
output, max power
output.
Torque speed and Torque 2 4
6 2
slip characteristics. B-page 733
Starting of Induction 4
motors, necessity stator B-page 791- 7 2
side controls.
796
Rotor side controls on slip 3 4
ring Induction motors
8 2
including injecting emfs B-page 804
into rotor circuit.
Circle diagram 2 3
development and D-Page 775-
9 2 practice.
780
Production of harmonic 2 3 4
component currents in
motors, reduction A-page 269-
10 2 crawling, cogging
270
overcoming methods.
Double squirrel cage 2 4
rotor and its A-page 332-
11 2 characteristics.
345
Speed control of 3 4
Induction motors for both
types and their characteristics change of
D-page 530- 12 2
voltage and change of 545
frequency.
Construction of stator, 2 3 4
types of rotors , salient
3 1 2 D-page 236 synchronous machines.
Principle of operation, 1 3 4
2 2
D page 269 armature windings, lap
and wave windings,
parallel paths.
Harmonics generation in 2 3
emf reasons, suppression
winding factors and EMF
B-Page 271- 3 2
equation.
272
Armature reaction, 1 3 4
leakage reactance,
synchronous reactance ,
synchronous impedance,
D-Page 543- 4 2
armature effective 545
resistance.
Experimental 2 3 4
determination of Zs, O.C
5 2
test, S.C test, Armature A-page 557-
resistance measurement. 559
Phasor diagram of various 2 4
loads, load
6
characteristics, regulation C- page 552-
of alternator
554
Regulation by Zs method 1 4
and MMF method.
7 7 2 E- Page 557
Inaccuracies of 2 4
regulation, pessimistic and optimistic values, ZPF
E- Page 554- 8 2
method of regulation.
556
ASA method of regulation 1 3 4
phasor approach and
9 2
analysis B- page565-
567
Regulation of salient 2 3 4 E-Page 617-
10 2
pole machines ,two 619
reaction approach and
analysis Xd, Xq
Two reaction analysis, 1 2 3
phasor approach,
experimental
E- Page 652- 11 2
determination of Xd, Xq 654
4 Development of 2 3 4 E- Page 541-
1 2 equivalent circuit phasor
549
diagrams analysis
Excitation systems, 3 4
parallel operation,
2 necessity, conditions, Page 541-549
sequence of operations.
Synchronization by dark 2 3
3
lamp, dark and bright
lamp methods, circuits Page 615
Synchronizing current, 1 2
4 syn torque, load sharing,
effect of change of Page 637-639
excitation.
Effect of mechanical 3 4
5 power input to prime
mover, analysis of short Page 580-582
circuit
Different wave forms of 4 6
6 currents at short circuit,
sub transient , transient Page 644-645
and SS reactance.
7 Synchronous motors, non 2 3 4
self starting or principle
of operation, phasor Page 650-651
diagrams floating
Armature reaction in 3 4 6
synchronous motors,
8
phasor diagrams Page 543-545
Variation of current with 2 3
excitation , power factor
9
with excitation Page 652
10 Mathematical analysis for 1 4 6
power developed,
hunting and its Page 647-650
suppression
Methods of starting of 1 4 6
11 synchronous motors,
synchronous induction
motors
Page 676-679
Single phase motor types, single phase induction
motors, constructional
features
Double revolving field 1 6
5 1
theory, cross field theory
to produce torque Page 680
Split phase motors 4 6
2 construction, principle of
operation, characteristics, Page 682
types
3 Construction of shaded 2 4 6
pole motor, principle of
operation, characteristics. Page 683
Signature of HOD Signature of faculty
Date: Date:
Note: 1. ENSURE THAT ALL TOPICS SPECIFIED IN THE COURSE ARE MENTIONED.
2. ADDITIONAL TOPICS COVERED, IF ANY, MAY ALSO BE SPECIFIED IN BOLD
3. MENTION THE CORRESPONDING COURSE OBJECTIVE AND OUT COME NUMBERS AGAINST EACH TOPIC.
Note: Text Book A) Theory and performance of Electrical machines by J.B.Gupta B) Performance and design of Alternating current machines by M.G.Say C) Electrical Machinery by Dr. P.S.Bhimbra D) Electrical Machines by R.K.Rajput E) Electrical Machines Theory and practice by M.N.Bandhyopadhyay
Gokaraju Rangaraju Institute of Engineering and Technology
(An Autonomous Institute under JNTUH)
Department/Program-EEE
Program Educational Objectives:
This education is meant to prepare our students to thrive and to lead. In their careers, our
graduates:
1. Will have successful technical or professional careers, including supportive and leadership roles on multidisciplinary teams.
2. Will acquire, use and develop skills required for effective professional practices.
3. Will acquire the holistic education necessary to be a responsible member of society.
4. Engage in life-long learning to remain current in their profession and be leaders in our
technological society.
Programme Learning Outcomes:
Students in the Electronics and Communication Engineering program should, at the time of their graduation, be in possession of:
a. Ability to apply knowledge of mathematics, science, and engineering.
b. Ability to design and conduct experiments, as well as to analyze and interpret data.
c. Ability to design a system, component, or process to meet desired needs
Within realistic constraints such as economic, environmental, social,
political, ethical, health and safety, manufacturability, and sustainability.
d. Ability to function on multi-disciplinary teams.
e. Ability to identify, formulate, and solve engineering problems.
f. Understanding of professional and ethical responsibility.
g. Ability to communicate effectively.
h. Broad education necessary to understand the impact of engineering solutions in a global,
economic, environmental, and societal context.
i. Recognition of the need for, and an ability to engage in life-long learning.
j. Knowledge of contemporary issues.
k. Ability to utilize experimental, statistical and computational methods and tools necessary for
engineering practice.
l. Graduates will demonstrate an ability to design electrical and electronic circuits, power
electronics, power systems; electrical machines analyze and interpret data and also an ability to
design digital and analog systems and programming them.
Program Educational Objectives(PEOs)-Program Outcomes(POs)
Relationship Matrix (Indicate the relationships by M or H)
P-Outcomes a b c D e f g h i j k l
PEOs
1 M M H H H H
2 M M H H H
3 M M H H H H
4 M M H M H H M H
Course Outcomes-Program Outcomes (POs) Relationship Matrix (Indicate the relationships by mark “H or M”)
P-Outcomes a b c D e f g h i j k l
C-Outcomes
1 H M H M H M M
2 H H M M H M M H M
3 H H M M H H H H M
4 H H M H H M H M H H
5 H H H M H M H H H
6 H H M H M M H H H
7 H H M M M M M H M
List of Assessments :
1.Direct Assessment --- Exams
2. Indirect Assessment ---- Interview/ viva-voce
3. Formative Assessment --- questions awaken during lesson
4.Summative Assessment – questions raised at the end of the Unit
5. Balancing assessment --- promoting the discussions between the students.
List of Verbs used for writing the Objectives and Outcomes
1. Regular attendance to classes. 2. Viva-voce during the class. 3. Written tests clearly linked to learning objectives 4. Classroom assessment techniques like tutorial sheets and assignments.
Gokaraju Rangaraju Institute of Engineering and Technology
Academic Year : 2018-19 Semester : II Name of the Program: B.Tech ……EEE …… Year: ……II…Section:… A/B…… Course/Subject: ………AC MACHINES … Course Code: GR17A2041
Name of the Faculty: ……VVS Madhuri………….. Dept.: …EEE……
Designation: ASSISTANT PROFESSOR
No. of Objectives No. of Outcomes
Units Remarks Achieved Achieved
Unit 1 Polyphase induction motors-construction details of cage 1,2 1,3,4 and wound rotor machines-production of a rotating
magnetic field - principle of operation - rotor emf and rotor
frequency - rotor reactance, rotor current and pf at
standstill and during operation.
Unit 2 Characteristics of Induction Motors: Rotor power input, 1,2 1,3,4
rotor copper loss and mechanical power developed and
their inter relation-torque equation-deduction from torque
equation - expressions for maximum torque and starting
This Assignment corresponds to Unit No. / Lesson ………1………………………
1. What are various types of rotors in three phase induction motor
2. How does a rotor rotate in 3 ph induction motor
3. Why armature is on stator part in AC machines
Please write the Questions / Problems / Exercises which you would like to give to the students and also mention the Objectives/Outcomes to which these Questions / Problems / Exercises are related.
This Assignment corresponds to Unit No. / Lesson ………Unit ..2………………………………….
1. Explain briey the different methods of speed control from rotor side of 3 phase induction motor
2. Describe the development of electromagnetic torque in a squirrel cage induction motor
through the interaction of flux and mmf wave when the rotor is running at a speed less than
synchronous speed.
3. Explain the principle of operation of poly phase induction motor.
Please write the Questions / Problems / Exercises which you would like to give to the students and also mention the Objectives/Outcomes to which these Questions / Problems / Exercises are related.
This Assignment corresponds to Unit No. / Lesson ………Unit ..3………………………….
1. Derive an expression for distribution factor.
2.Define pitch factor? Derive an expression for pitch factor.
3.What is armature reaction? Explain its effect on the performance of the alternator for different load power factors.
4.With neat circuit diagram, explain various tests to be conducted on alternator to determine its synchronous impedance.
5. Explain how Xd and Xq can be determined experimentally?
Please write the Questions / Problems / Exercises which you would like to give to the students and also mention the Objectives/Outcomes to which these Questions / Problems / Exercises are related.
Objective Nos.: …………3 and 4……………………………………………………………….
Outcome Nos.: ………… 2 and 3…………………………………………………………………………….
Signature of HOD Signature of faculty
Date: Date:
Gokaraju Rangaraju Institute of Engineering and Technology
This Assignment corresponds to Unit No. / Lesson ………Unit 4………………………………….
1 Explain the action of synchronous motor under loaded conditions.
2. Explain the construction and operating principle of syn. motor.
3.Draw and explain the phasor diagrams of syn. motor when over and under excited conditions.
4.What is the relation between the speed and frequency and number of poles of a syn. Motor.
5.Also give the principle of operation of synchronous motor.
6.Describe why synchronous motor will not run other than syn. speed.
7. Draw and explain the phasor diagrams of syn. motor when over and under excited conditions.
8. Derive an expression for power developed in a synchronous motor?
9. Assuming two axis model, draw the phasor diagram of a syn. motor drawing leading current.
10. ) Discuss in detail about “V” and “Λ” curves of synchronous motor.
11)Draw the excitation circle for a synchronous motor. How is it derived?
12)Show the locus of stator current for a constant output of 3phase synchronous motor
connected to a constant voltage, constant frequency bus- bars is circle.
13)Discuss with circuit diagrams the methods of starting of syn. Motor.
14)Draw and explain the phasor diagrams of syn. motor when over and under excited conditions.
15)Draw the excitation circle for a synchronous motor. How is it derived?
16)What is hunting How it is suppressed in synchronous motors.
17)Explain the ‘power circle’ for a given synchronous motor.
Please write the Questions / Problems / Exercises which you would like to give to the students and also mention the Objectives/Outcomes to which these Questions / Problems / Exercises are related.
1.Using double field revolving field theory explain the torque slip characteristic of of a single phase
induction motor and prove that it can not produce starting torque. Or Prove that a single phase motor
winding when excited by a single phase supply produces two equal and opposite revolving fields.
2 “The centrifugal switch of a single phase motor failed to open”. Explain the
after effects in the performance.
3 Discuss the difference between capacitor start induction run motor and capacitor start and run induction motor. Draw the performance characteristics.
4 Explain the equivalent circuit of single phase Induction motor & give all necessary equations.
5. Explain the construction of Shaded Pole motor
Please write the Questions / Problems / Exercises which you would like to give to the students and also mention the Objectives/Outcomes to which these Questions / Problems / Exercises are related.
This Assignment corresponds to Unit No. / Lesson ………Unit 1………………………………….
1.) Explain the effects of skewing the rotor slots in a squirrel cage induction motor. Discuss the factors determining the choice of rotor slots in a squirrel cage induction motor.
2.) A 3 phase induction motor has 2 poles and is connected to 400V, 50Hz supply.
Calculate the actual rotor speed and rotor frequency when the slip is 4%. [8+8]
3.) The rotor resistances per phase of a 6 pole 50 Hz slip ring motor is 0.2 ohm and its full load speed is 750rpm. Calculate the external resistance per phase that must be added to lower the speed to 550 rpm. Given that torque is same in two cases.
4.) Why the power factor of a lightly loaded induction motor is quite low?
Please write the Questions / Problems / Exercises which you would like to give to the students and also mention the Objectives/Outcomes to which these Questions / Problems / Exercises are related.
1) A squirrel cage induction motor, when started by means of an star delta starter takes 200% of full load current (line) and develops 44% of full load torque at starting. Calculate the starting torque and current, if an auto transformer with 75% tapping is applied. 2) Explain the principle of operation of induction generator. 3) The rotor resistance per phase of an 8 pole a 50Hz slip ring motor is 0.25 ohm
and its full load speed is 720rpm. Calculate the external resistance per phase that
must be added to the lower speed to 600 rpm. Given that torque is same
in two cases.
4) Calculate the steps in a 5 step rotor resistance starter for a 3 phase induction motor. The slip at the maximum starting current is 2% with slip ring short circuited and the rotor resistance per phase is 0.015 ohm.
Gokaraju Rangaraju Institute of Engineering and Technology
This Assignment corresponds to Unit No. / Lesson ………Unit 4………………………………….
1)What are the effects of change of excitation and mechanical power input on alternators operated in parallel.
2) A 3MVA, 6pole alternator runs at 1000r.p.m in parallel with other machines on 3300v
bus bars. The synchronous reactance is 25%. Calculate the synchronizing power per one
mechanical degree of displacement and the corresponding synchronizing torque.
3) Derive an expression for power developed in a synchronous motor. And hence deduce expression for max power developed.
4)A 6600v, 3-phase, star connected synchronous motor with an armature resistance of 2 ohms per phase and reactance of 20 ohms per phase, draws a full load current of 70Amps at 0.8p.f. leading. Find the e.m.f induced, output power and efficiency of the machine if the stray losses are equal to 30kw.
This Assignment corresponds to Unit No. / Lesson ………Unit 5…………………………………
1)Explain the principle of operation of various single phase induction motors with their torque speed characteristics.
2) Explain the various tests conducted on single phase motor for finding its equivalent circuit. 3) Discuss the difference between capacitor start induction run motor and
capacitor
start and run induction motor. Draw the performance characteristics.
4) Explain the construction of Shaded Pole motor.
Gokaraju Rangaraju Institute of Engineering and Technology
(Autonomous) Bachupally, Kukatpally, Hyderabad – 500 090, A.P., India.
COURSE COMPLETION STATUS
Academic Year : 2018-19
Semester : II
Name of the Program: B.Tech …EEE… Year: …II….. Section: A / B
