ELECTRICAL MACHINES-I

Total Credit- 04
Subject Code:- BEEE403T

Unit-I Single Phase Transformer ( 12-Hrs)
Revision of Single Phase Transformer, Phasor Diagram Under Different Load Conditions,
Losses, Equivalent Circuit, Open Circuit and Short Circuit Test, Voltage Regulation, Efficiency,

Condition of Maximum Efficiency, All Day Efficiency, Polarity Test. Single phase Auto-
Transformer, Working, Merits and Demerits. Applications.

Three Phase Transformer: -Principle and Operation, Connection and Phasor Groups, Polarity
Test, Open Circuit and Short Circuit Test, Conditions of Parallel Operation.

Unit II D.C. Machines (08-Hrs)
Basic Principle and Operation of D.C. Motor and D.C. Generator, Emf Equation and Torque
equation, Types of D.C. Machines, Characteristics and Speed Control of D.C. Shunt and D.C.
Series Motor, Losses and Efficiency of D.C. Motor. Necessity of Starter and Constructional
Details of Three Point Starter. Armature Reaction in D. C. Machines. Applications.
Unit III Three Phase Induction Motor (08-Hrs)
Construction Details, Types, Principle, Production of Torque, Torque Equation and Condition of
Maximum and Starting Torque, Losses and Efficiency, Torque-Slip Characteristics, Behavior for
Different values of Slip. No Load Test and Blocked Rotor Test. Starting methods of Three Phase
Induction Motor. Applications.
Unit IV Synchronous Machines (08-Hrs)
Three Phase Synchronous Generator : -Introduction, Constructional features of Salient Pole
and Cylindrical Pole Rotor Machines, Introduction to Armature Winding and Field Winding,
Winding Factors and EMF Equation, Armature Reaction, Phasor Diagram Under Load
Condition, Regulation and Synchronous Impedance Method to Find Voltage Regulation.
Three Phase Synchronous Motor: - Construction and Principle, Starting of Synchronous
Motor, Motor on Load, Effect of Changing Field Excitation at Constant Load, V and Inverted-V
Curves.
Applications.
Unit V Single Phase Machines (07-Hrs)
Single Phase Induction Motor :-
Principle and Operation, Double Field Revolving Theory. Principle and Working of Shaded
Pole Induction Motor , Split Phase Induction Motor and Capacitor Start Capacitor Run Motor.
Applications.
Principle, Working And Applications Of Special Machines:-
Universal Motor, Hysteresis Motor, Brushless D. C. Motor, A.C. Series Motor.

TEXT BOOKS:-
1. I. J. Nagrath , D.P. Kothari, “Elecrtcal Machines,”, Tata McGraw- Hill Publishing
Company Ltd.
2. P.S.Bhimbra,”Electrical Machinery”, Khanna Publishers.
3. P.K. Mukherjee, S. Chakrabvorty, “ Electrical Machines”, Dhanpat Rai Publications.
4. P.S. Bhimbra , “Generalized Theory in Electrical Machines”, Khanna Publishers.
5. D C Kulshreshtha, “Basic Electrical Engineering,” The McGraw Hill Higher Education
Private Limited, New Delhi.

6. S.G.Tarnekar, P.P. Kharbanda, S.B.Bodkhe, S.D. Naik , “ Laboratory Courses in
Electrical Engineering,” S. Chand & Company Ltd., New Delhi.
7. Use of ICT Tools.

REFERENCE BOOKS :-
1. M.G.Say, “ Performance and Design of A.C. Machines,” CBS Publishers and
Distributors Pvt. Ltd.
2. A.F. Fitzgerlad, Charles Kingdey, Jr. Stephan D. Umans, “Electrical Machinery”,
Fifth Edition in SI Units, McGraw Hill Book Company.
3. D.P. Kothari, B.S.Umre, “Laboratory Manual for Electrical Machines,” Second
Edition , I.K. International Publishing House Pvt.Ltd., New Delhi.