emec II.docx

EX-503 ELECTRICAL MACHINE-IIUnit-ID.C. Machine-IBasic construction of DC machines; types of DC machines and method of excitation; lap andWave windings; Emf equation; armature reaction and methods of limiting armature reaction;Commutation process and methods for improving commutation; Basic performance of DCGenerators and their performance characteristics; Metaldyne and Amplidyne; permanent magnetDC motors; Brush less dc motors,Unit-IID.C. Machine-IIBasic operation of DC motors; Torque equation; operating characteristics of DC motors,Starting of DC motors- 2point, 3 point and 4 point starters; speed control of DC motors; lossesAnd efficiency of DC machines; testing of DC machines, direct testing, Swinburne’s test andHopkinson’s test. Application of DC machines

Unit-IIISynchronous Machine-IConstruction; types of prime movers; excitation system including brushless excitation; polyphaseDistributive winding, integral slot and fractional slot windings; emf equation, generation ofHarmonics and their elimination; armature reaction; synchronous reactance and impedance,Equivalent circuit of alternator, relation between generated voltage and terminal voltage, voltageRegulation of alternators using synchronous impedance, mmf, zpf and new A.S.A method.Unit-IVSynchronous Machine-IISalient pole machines; two reaction theory equivalent circuit model and phasor diagram;Determination of Xd and Xq by slip test; SCR and its significance; regulation of salient poleAlternator, power angle equation and characteristics; synchronizing of alternator with infiniteBusbar, parallel operation and load sharing; synchronizing current, synchronizing power andSynchronizing torque coefficient; synchroscopes and phase sequence indicator; effect of varyingExcitation and mechanical torque,

Unit-VSynchronous machine-IIISynchronous motor operation, starting and stopping of synchronous motor, pull in torque, motorUnder load power and torque, reluctance torque, effect of excitation, effect of armature reaction,Power factor adjustment, V curves, inverted V curves, synchronous motors as power factorCorrecting device, super synchronous and sub synchronous motors, hunting and damper windingEfficiency and losses.Analysis of short circuit oscillogram, determination of various transient, sub transient and steadyReactance’s and time constants, expression of transient and sub transient reactances in terms ofSelf and mutual inductances of various winding, short circuit current, equivalent circuit. SinglePhase synchronous motors- hysteresis motor, reluctance motor.Repulsion motor, stepper motor, switched reluctance

Books:1. M.G. Say, Performance & design of AC machines, CBS publishers & distributors,Delhi, 3rd edition

2. A.E. Clayton & N.N. Nancock, the Performance & design of DC machines CBSPublications & distributors, Delhi, 3rd edition3. P.S. Bhimbra, Electrical Machinery, Khanna Pub.4. P.S. Bhimbra, Generalized theory of Electrical Machines, Khanna publishers,Delhi,5. Ashfaq Husain, Electric Machines, Dhanpat Rai, New Delhi5. I.J. Nagrath & D.P. Kothari, Electric Machines, Tata McGraw Hill, New Delhi,6. Syed A. Nasar, Electric Machines & Power Systems, Volume I, Tata McGraw Hill,New Delhi7. A. E. Fitzerald, C. Kingsley & S.D. Umans , Electric Machinery Tata McGrawHill, New Delhi, 5th edition

IES Group of Institutions

Lesson Plan

Department Electrical & Electronics

Engineering

Session

Name of Teacher Semester V

Subject Electrical Machine -II Sub. Code EX-503

S.NO. TOPICS TO BE COVERED PROPOSED

NO OF LECT.

ACTUAL NO

OF LECTURE

DATE NO. OF

STUDENT

PRESENT

Unit I = D.C. Machine-I

1.Basic construction of DC machines; 1

2.types of DC machines and method of excitation 2

3. lap andwave windings; Emf equation;

2

4. armature reaction and methods of limiting armature reaction

2

5. Commutation process and methods for improving commutation;

2

6. Basic performance of DCgenerators and their performance characteristics

2

7. Metadyne and Amplidyne; permanent magnetDC motors; Brush less dc motors,

2

Unit II= D.C. Machine-II

1.Basic operation of DC motors; Torque equation 2

2.Operating characteristics of DC motors 2

3. Starting of DC motors- 2point, 3 point and 4 point starters

2

4.speed control of DC motors 1

5.Losses and efficiency of DC machines; 1

6. testing of DC machines, direct testing, Swinburne’s test andHopkinson’s test

2

7.Application of DC machines 1

S.NO. TOPICS TO BE COVERED PROPOSED

NO OF LECT.

ACTUAL NO

OF LECTURE

DATE NO. OF

STUDENT

PRESENT

Unit III= Synchronous Machine-I

1. Construction; types of prime movers; excitation system including brushless excitation;

2

2. Polyphase distributive winding, integral slot and fractional slot windings;

1

3. emf equation, generation ofharmonics and their elimination

2

4. armature reaction; synchronous reactance and impedance

2

5. equivalent circuit of alternator, relation between generated voltage and terminal voltage

2

6. Voltage regulation of alternators using synchronous impedance, mmf, zpf and new A.S.A method

2

Unit IV= Synchronous Machine-II

Salient pole machines; two reaction theory equivalent circuit model and phasor diagram;

2

determination of Xd and Xq by slip test; SCR and its significance

2

regulation of salient polealternator, power angle equation and characteristics

2

synchronizing of alternator with infinitebusbar,; parallel operation and load sharing

2

synchronizing current, synchronizing power andsynchronizing torque coefficient

2

synchroscopes and phase sequence indicator; effect of varyingExcitation and mechanical torque,.

2

Unit V= Synchronous Machine-III

Synchronous motor operation, starting and stopping of synchronous motor

2

pull in torque, motor under load power and torque, reluctance torque

2

effect of excitation, effect of armature reaction, 2

power factor adjustment, V curves, inverted V curves, synchronous motors as power factorcorrecting device

2

super synchronous and sub synchronous motors, hunting and damper windingefficiency and losses

2

Analysis of short circuit oscillogram, determination of various transient, sub transient and steady reactance’s and time constants, expression of transient and sub transient reactances in terms of self and mutual inductances of various winding, short circuit current, equivalent circuit

2

Single phase synchronous motors- hysteresis motor, reluctance motor

2

Repulsion motor, stepper motor, switched reluctance

2

REFERENCE BOOKS:

1. P.S. Bhimbra, Electrical Machinery, Khanna Pub.

2. P.S. Bhimbra, Generalized theory of Electrical Machines, Khanna publishers,Delhi,3. Ashfaq Husain, Electric Machines, Dhanpat Rai, New Delhi4. I.J. Nagrath & D.P. Kothari, Electric Machines, Tata McGraw Hill, New Delhi,5. Syed A. Nasar, Electric Machines & Power Systems, Volume I, Tata McGraw Hill,New Delhi6. A. E. Fitzerald, C. Kingsley & S.D. Umans , Electric Machinery Tata McGraw Hill


ASSIGNMENT


Engineering

Session



Assignment I

1. What is commutation? State methods of improving commutation and describe

any one in detail.

2. Explain External and Internal characteristics of D.C. shunt generator in brief.

3. Explain different methods for speed control of Series Motors.

4. Compare field control and armature voltage control methods of speed control of a DC motor.

5. Explain the phenomena of armature reaction in a DC machine. State its remedies

6. Draw schematic diagram of a dc machine with labels. State the functions of (i) pole Shoe, (ii) commutator and (iii) yoke.

7. Differentiate between self-excited and separately-excited dc machines. Draw the Load characteristic of dc shunt and series generator.

8. A D.C. shunt generator delivers 450 Amp at 230V and the resistance of the shunt Field and armature are 50Ω and 0.03Ω respectively. Calculate the generated emf.

9. write short note on any two of the following:

(a) Stepper motor (b) Repulsion motor (c) reluctance motor (d) hysteresis motor

10 explain construction, working and use of a reluctance motor.


ASSIGNMENT


Engineering

Session



Assignment II

1. Derive the expression for e.m.f. of an alternator .

2.explain the following: (a) distribution factor (b) coil span factor

3.explain the principle of operation of 3 phase synchronous machine.

4.explain distributive winding and its advantage.

5.explain importance of computing voltage regulation in an alternator.

6.draw and explain the phasor diagram of salient pole alternator.

7.what do you mean by hunting? How can we reduce the hunting.

8.what condition must be fulfilled before an alternator can be connected to an infinite bus?

9.explain the reason of parallel operation of electrical machine.

10.explain the slip test of synchronous machine.how can we measure the direct axis and quadrature axis reactance for synchronous machine?


TOPICS TAUGHT BEYOND SYLLABUS


Engineering

Session




TUTORIALS


Engineering

Session

S.NO. DATE TOPICS REASON



Tutorial I


TEACHING AIDS

Department Electrical & Electronics Session

Engineering



SUBJECT DATE TOPIC TYPE(GREEN BOARD/OHP/LCD)

Electrical Machine -II

Basic construction of DC machines; types of DC machines and method of excitation

LCD

lap and wave windings; Emf equation; armature reaction and methods of limiting armature reaction;

GREEN BOARD

Commutation process and methods for improving commutation; Basic performance of DCgenerators and their performance characteristics

GREEN BOARD

Metadyne and Amplidyne; permanent magnetDC motors; Brush less dc motors,

GREEN BOARD

Basic operation of DC motors; LCD

Torque equation; Operating characteristics of DC motors, Starting of DC motors

GREEN BOARD

2point, 3 point and 4 point starters LCD

speed control of DC motors; lossesand efficiency of DC machines; testing of DC machines, direct testing, Swinburne’s test andHopkinson’s test.

GREEN BOARD

Application of DC machines LCD

Construction; types of prime movers; excitation

LCD

Polyphase distributive winding, integral slot and fractional slot windings; emf equation, generationofharmonics and their elimination

GREEN BOARD

armature reaction LCD/OHP

synchronous reactance and impedance, GREEN BOARD

equivalent circuit of alternator, relation between generated voltage and terminal voltagevoltageregulation of alternators using synchronous impedance, mmf, zpf and new A.S.A method.

GREEN BOARD

Salient pole machines; two reaction theory equivalent circuit model and phasor diagram

LCD/OHP

determination of Xd and Xq by slip test; SCR and its significance; regulation of salient polealternator, power angle equation and characteristics

GREEN BOARD

synchronizing of alternator with infinitebusbar,; parallel operation and load sharing; synchronizing current, synchronizing power andsynchronising torque coefficien

GREEN BOARD

synchroscopes and phase sequence indicator; effect of varying excitation and mechanical torque,.

GREEN BOARD & LCD

Synchronous motor operation LCD

starting and stopping of synchronous motor, pull in torque, motor under load power and torque, reluctance torque, effect of excitation

GREEN BOARD

effect of armature reaction, power factor adjustment, V curves, inverted V curves

LCD /OHP

synchronous motors as power factorcorrecting device, super synchronous and sub synchronous motors, hunting and damper windingefficiency and losses.

GREEN BOARD

Analysis of short circuit oscillogram, determination of various transient, sub transient and steadyreactances and time constants, expression of transient and sub transient reactances in terms ofself and mutual inductances of various winding, short circuit current, equivalent circuit

GREEN BOARD

Singlephase synchronous motors- hysteresis motor etc.

LCD

LIST OF EXPERIMENT CONDUCTEDCLASS:SUBJECT:EX-503 ELECTRICAL MACHINE-IIYEAR:SEMESTER: 5 thEXP.NO DATE NAME OF EXPERIMENT PERFORMING/NON

PERFORMING

1

2

3

4

5

6

7

8

9

10 IES Group of Institutions

DETAILS OF EXTRA LECTURES

Department Electrical & Electronics Session

Engineering




Mid sem paper I

SUB: EMEC II, V sem

1. Draw schematic diagram of a dc machine with labels. State the functions of (i) pole Shoe, (ii) commutator and (iii) yoke.

2. Differentiate between self-excited and separately-excited dc machines. Draw the Load characteristic of dc shunt and series generator.

3. A D.C. shunt generator delivers 450 Amp at 230V and the resistance of the shunt Field and armature are 50Ω and 0.03Ω respectively. Calculate the generated emf.

4. Compare field control and armature voltage control methods of speed control of a

S.NO. DATE TOPICS REASON

DC motor.

5. Explain the phenomena of armature reaction in a DC machine. Draw the diagram.


Mid sem paper II

SUB: EMEC II, V sem

1. Draw and explain the phasor diagram of salient pole alternator.

2. What do you mean by hunting? How can we reduce the hunting?

3. What condition must be fulfilled before an alternator can be connected to an infinite bus?

4. Explain the reason of parallel operation of electrical machine.

5. Explain the slip test of synchronous machine. How can we measure the direct axis and quadrature axis reactance for synchronous machine?

Documents

emec II.docx