laxmi institute of technology · of 1- phase induction motor, equivalent circuit of 1phase...

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


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



ASSIGNMENT – II



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





ASSIGNMENT – III





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

laxmi institute of technology · of 1- phase induction motor, equivalent circuit of 1phase...

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