laxmi institute of technology · of 1- phase induction motor, equivalent circuit of 1phase...
Post on 21-Feb-2020
10 Views
Preview:
TRANSCRIPT
LAXMI INSTITUTE OF TECHNOLOGY SARIGAM
COURSE FILE
Faculty Name : BIRAJA PRASAD DAS
Subject Name : AC MACHINES
Subject Code : 2140906
Course Name : B.E (Electrical Engineering)
Semester : IV
Session : Dec - April 2019
DEPARTMENT OF ELECTRICAL ENGINEERING
Institutional Vision To educate the unreached talents to beacon the nation through research and
innovative technology
Institutional Mission ● To impart seamless education to individual scholars for delivering the highest
quality professionalism and cutting edge research for the benefit of society on a
national and global scale.
● To foster and maintain mutually beneficial partnerships with our alumni,
friends, industry, and local, state, and central governments through public
services assistance and collaborative research.
● To be the centre of excellence for creating holistic citizens inculcated with
ethical, moral and social values in diverse culture of Indian environment.
Departmental Vision
To become a trailblazer in providing education and training in the field of
Electrical Engineering to the ambitious graduates to be proficient in their career.
Departmental Mission
• To provide education of high global standards with the able guidance of
dedicated professionals and a state of art ambience.
• To motivate the electrical engineers to focus on the eco-friendly renewable
sources of energy.
• To impart quality education for enhancing opportunities
DEPARTMENT OF ELECTRICAL ENGINEERING
CLASS TIME-TABLE
SEM: 4th(C-243) TERM: Dec - April 2019 W.E.F: 17/12/2018
DAY↓ TIME→
08:20
to
09:10
09:10
to
10:00
10:10
to
11:00
11:00
to
11:50
12:00
to
12:50
12:50
to
01:35
Monday SUBJECT
FACULTY
ACM(BPD)1(M/C LAB)
EPG(PNP)2(EW/S LAB)
S&S(RA)3(C 249)
FT(SB) ATHE (AAS) DE(NM) SS (RA)
Tuesday SUBJECT
FACULTY
DE(NM)1(C 247)
S&S(RA)2(C 249)
EPG(PNP)3(EW/S LAB)
EPG (PNP) SS (RA) FT(SB) ATHE(AAS)
Wednesday SUBJECT
FACULTY DE(NM) SS(RA) ATHE(AAS) FT(SB) EPG(PNP) ACM (BPD)
Thursday SUBJECT
FACULTY SS(RA) DE(NM)
EPG(PNP)1(EW/S LAB)
ACM((BPD)2(M/C LAB)
DE(NM)3(C 247) FT(SB) EPG(PNP)
Friday SUBJECT
FACULTY ACM(BPD) FT(SB) DE(NM) ACM(BPD)
S&S(RA)1(C 249)
ACM((BPD)3(M/C LAB)
DE(NM)2(C 247)
Saturday SUBJECT
FACULTY ACM (BPD) EPG(PNP) ACM(BPD) SS(RA) DESIGN ENGG.(RA)
PERSONAL TIME-TABLE
DAY↓ TIME→
08:20
to
09:10
09:10
to
10:00
10:10
to
11:00
11:00
to
11:50
12:00
to
12:50
12:50
to
01:35
Monday SUBJECT
FACULTY
ACM(BPD)1
(M/C LAB)
Tuesday SUBJECT
FACULTY
Wednesday SUBJECT
FACULTY ACM
Thursday SUBJECT
FACULTY
ACM((BPD)2
(M/C LAB)
Friday SUBJECT
FACULTY ACM ACM
ACM((BPD)3
(M/C LAB)
Saturday SUBJECT
FACULTY ACM ACM
Laxmi Institute of Technology , Sarigam Approved by AICTE, New Delhi; Affiliated to Gujarat Technological University, Ahmadabad
Academic Year : 2018-2019
SCHEME
SYLLABUS
Unit Topics Teaching
Hours
Module
Weightage
I
POLY-PHASE INDUCTION MOTOR:
Construction, Types of motor, Working principle, Rotating
magnetic field. Operating parameters at different load, No-load
& blocked rotor test, Equivalent circuit, Phasor diagram, Circle
diagram, Efficiency and slip scale with the help of circle
diagram, Effect of rotor resistance on performance of motor,
Double cage motor and its equivalent circuit, Introduction to
machine dynamics. Starters of poly-phase induction motor
including soft starter, Methods of speed control of 3- phase
motor, Schematic diagram and advantages of Variable Voltage
Variable Frequency drive. Electrical transients in induction
machine, Magnetic levitation: Principle, advantages and
application of linear induction motor. Effect of harmonics,
Harmonic torques, Cogging & Crawling, Effect of unbalanced
voltages on performance of motor. Performance of motor with
variable voltage and frequency. Testing of induction motor as
per IS, Energy efficient motors.
20 35
2 INDUCTION GENERATOR:
Principle of operation and application, Its load and p. f. control.
02 05
3 SINGLE PHASE A.C. MOTORS:
Double field revolving theory, Starting & running performance
of 1- phase induction Motor, Equivalent circuit of 1phase
induction motor, Types of single phase motors, Principle and
operation of split phase, Resistance start, Capacitor start and
capacitor start & run induction motor, Shaded pole induction
motor, Fractional horse power motors.
06 10
Semester Course Title Course Code Theory Paper
L T P
IV AC MACHINES 2140906 4 0 2 70
04 SYNCHRONOUS MACHINES: Construction, Types,
Applications, Working principle. Equation of induced emf with
and without harmonics in MMF, pitch factor and distribution
factor, MMF of distributed windings, Torque equation,
Machine efficiency, Armature reaction and its compensation,
Short circuit ratio, Effect of change in excitation, Effect of
change in torque and speed, Voltage regulation, Determination
of voltage regulation by Synchronous impedance method,
MMF method, ZPF method and AIEE method,
Synchronization: Importance and Methods of synchronization.
Operating characteristic, Load angle and Power flow
equations, Capability curves, Two reaction model of Salient
pole machines, Parallel operation, Load sharing between
parallel connected generators, Effect of unequal voltages &
unequal percentage impedance, Governor characteristics,
Introduction to single phase generators, Slip test for
measurement of direct axis and quadrature axis reactance for
salient pole machine, Sudden short circuit of Synchronous
machine, Hunting of synchronous machines and its prevention.
20 35
05 SYNCHRONOUS MOTOR: Methods of starting of
synchronous motors, Different torques in Synchronous motor,
Stability, Synchronous condenser, Synchronous phase
modifiers, V-curves and O-curves of Synchronous motors
AUTO SYNCHRONOUS MOTOR: Construction, principle
of operation, equivalent excitation current for various rotor
connections, circle diagram.
5 10
06 COMMUTTOR MOTOR: Construction and working
principle of Schrage motor, Universal motor and Repulsion
motor.
3 15
List of Reference Books
S.No Book Title Author Publication
1 Electrical Machines Gupta J B S K Kataria Publications
2 Electrical Technology Theraja B L S Chand Publications
3 Electric Machines Nagrath I J Tata McGraw Hill
4 Electrical Machines Ghosh Samarjit Pearson Education
LAXMI INSTITUTE OF TECHNOLOGY SARIGAM
Department of Electrical Engineering Academic Year: 2018 -2019
ASSIGNMENT – I
Name of the Subject: AC MACHINES Date: 28.02.2019
Subject Code: 2140906
Date of Submission: 02.03.2019
Name & Sign of Subject In-charge: Biraja Prasad Das
S. No Question Remarks
1. Give the classification of single phase motors
2. Explain any two types of single phase induction motors
3. Explain the double field revolving theory for operation of single phase
induction motor.
4. Explain the operation of shaded pole induction motor with diagram.
5. Develop equivalent circuit of a single phase induction motor ignoring
core losses
6. Explain the working principle of single phase induction motor .Mention
its four applications
7. What is the principle and working of hysteresis motor? Explain briefly.
8. Explain the construction and working of stepper motor.
10. Explain the principle of operation and applications of reluctance motor.
11 Explain the principle of operation and applications of repulsion motor
and hysteresis
LAXMI INSTITUTE OF TECHNOLOGY SARIGAM
Department of Electrical Engineering Academic Year: 2018 -2019
ASSIGNMENT – II
Name of the Subject: AC MACHINES Date: 23.03.2019
Subject Code: 2140906
S. No
Question
Remark
1 Explain construction and working principle of three-phase induction motor.
2 Explain methods of measurement of slip in three-phase induction motor.
3 Explain torque-slip characteristic of three-phase induction motor.
4 Discuss in details no-load & blocked rotor test of three-phase induction motor.
5 Discuss condition for maximum starting and running torque for three-phase induction motor.
6 Describe analogy of induction motor with transformer in details.
7 State methods of speed control for three-phase induction motor and explain any one of them in details.
8 State starting methods of three-phase induction motor and explain any one of them in details.
9 Explain working of double cage induction motor and its equivalent circuit.
10 Discuss electrical transients and their effects in case of induction machine.
11 Discuss advantages & applications of linear induction motor.
12 Write a detailed note on energy efficient motors.
13 Explain working of induction generator.
14 Explain effect of unbalance voltages & frequency variation on operation of induction motor.
15 Explain constructing steps for circle diagram of three phase induction motor.
16 Discuss the testing of induction motor as per IS.
17 Compare simplex & duplex windings in details.
18 Explain mush winding in details.
19 Explain hemitropic winding in details.
20 Describe fractional slot lap windings.
21 Discuss the functions of dummy coils, split coils and equalizer connections.
22 Explain why single phase induction motor is not self starting and enlist types of single phase motors.
23 Describe double filed revolving theory.
24 Explain working of capacitor start and run induction motor.
Explain working of shaded pole induction motor.
25 Explain equivalent circuit of 1-phase induction motor.
26 Discuss working of fractional horse power motors.
27 Explain working principle of split phase induction motor in details.
28 Discuss action of commutator as a frequency converter in details.
29 Compare squirrel cage and slip-ring induction motor performance in details with necessary diagrams.
30 Explain working of repulsion motor with necessary diagrams.
31 Explain working of Scharge motor with necessary diagrams.
32 Explain working of AC series motor with necessary diagrams.
33 Explain working of universal motor with necessary diagrams.
34 A 500V, 6 pole , 50Hz, Three phase Induction motor develops 20kW. When running at 995 rpm the p.f. is 0.87 lagging. Calculate (a) Slip (b) rotor copper loss (c) the total input if stator loss is 1500W (d) Line current (e) the rotor current frequency.
35 A 3000 V , 24 pole , 50Hz, Three phase star connected induction motor has slip ring rotor of resistance 0.016 ohms and standstill reactance 0.265 ohms per phase full load torque is
Date of Submission: 01.04.2019
Name & Sign of Subject In-charge: Biraja Prasad Das
LAXMI INSTITUTE OF TECHNOLOGY SARIGAM
Department of Electrical Engineering Academic Year: 2018 -2019
ASSIGNMENT – III
Name of the Subject: AC MACHINES Date: 07.04.2019
Subject Code: 2140906
Date of Submission: 14.04.2019
Name & Sign of Subject In-charge: Biraja Prasad Das
Question Remarks
1 Explain why a synchronous motor does not have starting torque
2 Explain one method of starting a synchronous motor.
3 Why does the power factor of industrial installation tend to be low?
How can it be improved?
4 Does the change in excitation affect the p.f of the synchronous
motor?
5 An over excited synchronous motor is called a synchronous
condenser. Explain
6 Mention some specific applications of synchronous motor.
7 Explain what happens when the load on a synchronous motor is
changed.
8 What is meant by constant power circle for synchronous motor?
9 What is meant by hunting in a synchronous motor? Why is it
undesirable? What is done to minimize it?
10 Explain V-curves and inverted V-curves
11 Draw the power angle diagram of a synchronous machine.
12 Explain briefly the principle of operation of three-phase synchronous
motor
13 Describe the effect of varying the excitation on the armature current
and power factor of a synchronous motor when input power to the
motor is maintained constant
Laxmi Institute of Technology , Sarigam Approved by AICTE, New Delhi; Affiliated to Gujarat Technological University, Ahmadabad
QUESTION BANK
CHAPTER 1&2 01 Explain construction and working principle of three-phase induction motor.
02 Explain methods of measurement of slip in three-phase induction motor.
03 Explain torque-slip characteristic of three-phase induction motor.
04 Discuss in details no-load & blocked rotor test of three-phase induction motor.
05 Discuss condition for maximum starting and running torque for three-phase induction motor.
06 Describe analogy of induction motor with transformer in details.
07 State methods of speed control for three-phase induction motor and explain any one of them in details.
08 State starting methods of three-phase induction motor and explain any one of them in details.
09 Explain working of double cage induction motor and its equivalent circuit.
10 Discuss electrical transients and their effects in case of induction machine.
11 Discuss advantages & applications of linear induction motor.
12 Write a detailed note on energy efficient motors.
13 Explain working of induction generator.
14 Explain effect of unbalance voltages & frequency variation on operation of induction motor.
15 Explain constructing steps for circle diagram of three phase induction motor. 16 Discuss the testing of induction motor as per IS.
17 Compare simplex & duplex windings in details.
18 Explain mush winding in details.
19 Explain hemitropic winding in details.
20 Describe fractional slot lap windings.
21 Discuss the functions of dummy coils, split coils and equalizer connections.
22 Explain why single phase induction motor is not self starting and enlist types of single phase motors.
23 Describe double filed revolving theory.
24 Explain working of capacitor start and run induction motor.
Explain working of shaded pole induction motor.
25 Explain equivalent circuit of 1-phase induction motor.
26 Discuss working of fractional horse power motors.
27 Explain working principle of split phase induction motor in details.
28 Discuss action of commutator as a frequency converter in details.
29 Compare squirrel cage and slip-ring induction motor performance in details with necessary diagrams.
30 Explain working of repulsion motor with necessary diagrams. 31 Explain working of Scharge motor with necessary diagrams.
32 Explain working of AC series motor with necessary diagrams.
33 Explain working of universal motor with necessary diagrams.
34 A 500V, 6 pole , 50Hz, Three phase Induction motor develops 20kW. When running at 995 rpm the p.f. is 0.87 lagging. Calculate (a) Slip (b) rotor copper loss (c) the total input if stator loss is 1500W (d) Line current (e) the rotor current frequency.
35 A 3000 V , 24 pole,50Hz, Three phase star connected induction motor has slip ring rotor of resistance 0.016 ohms and standstill reactance 0.265 ohms per phase full load torque is
CHAPTER 3
CHAPTER 4
01 Give the classification of single phase motors
02 Explain any two types of single phase induction motors
03 Explain the double field revolving theory for operation of single phase
induction motor.
04 Explain the operation of shaded pole induction motor with diagram.
05 Develop equivalent circuit of a single phase induction motor ignoring core
losses
06 Explain the working principle of single phase induction motor .Mention its four
applications
07 What is the principle and working of hysteresis motor? Explain briefly.
08 Explain the construction and working of stepper motor.
10 Explain the principle of operation and applications of reluctance motor.
11 Explain the principle of operation and applications of repulsion motor and
hysteresis
01 Explain why a synchronous motor does not have starting torque
02 Explain one method of starting a synchronous motor.
03 Why does the power factor of industrial installation tend to be low? How can it
be improved?
04 Does the change in excitation affect the p.f of the synchronous motor?
05 An over excited synchronous motor is called a synchronous condenser.
Explain
06 Mention some specific applications of synchronous motor.
07 Explain what happens when the load on a synchronous motor is changed.
08 What is meant by constant power circle for synchronous motor?
09 What is meant by hunting in a synchronous motor? Why is it undesirable?
What is done to minimize it?
10 Explain V-curves and inverted V-curves
11 Draw the power angle diagram of a synchronous machine.
12 Explain briefly the principle of operation of three-phase synchronous motor
13 Describe the effect of varying the excitation on the armature current and power
CHAPTER 5&6
01 Explain Construction and working principle of Schrage motor
02 Explain Universal motor and Repulsion motor in brief
03 Explain V curve
04 Explain different torques of induction motor
top related