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A Textbook for the Students of B.E. / B.Tech., U.P.S.C. (Engg. Services); Section ‘B’ of A.M.I.E. (I)]
Preface.We take an opportunity to present this standard treatise entitled as “Theory of Machines” to the students of Degree, Diploma and A.M.I.E. (I) classes in M.K.S. and S.I. units. The object of this book is to present the subject matter in a most concise, compact, to-the-point and lucid manner.
While writing the book, we have continuously kept in mind the examination requirements of the students preparing for U.P.S.C. (Engg. Services) and A.M.I.E. (I) examinations. In order to make this volume more useful for them, complete solutions of their examination papers up to 1975 have also been included. Every care has been taken to make this treatise as self-explanatory as possible. The subject matter has been amply illustrated by incorporating a good number of solved, unsolved and well graded examples of almost every variety. Most of these examples are taken from the recent examination papers of Indian and foreign universities as well as professional examining bodies, to make the students familiar with the type of questions, usually set in their examinations. At the end of each chapter Highlights have been added, which summarise the main topics discussed in the chapter for quick revision before the examination. After the highlights, a few exercises have been added for the students to solve them independently. Answers to these problems have been provided, but it is too much to hope that these are entirely free from errors. In short, it is earnestly hoped that the book will earn appreciation of the teachers and students alike.
The present multicolour edition has been thoroughly revised and brought up-to-date. Multicolour pictures have been added to enhance the content value and to give the students an idea of what he will be dealing in reality, and to bridge the gap between theory and practice. The mistakes which had crept in, have been eliminated. We wish to express our sincere thanks to numerous professors and students, both at home and abroad, for sending their valuable suggestions and recommending the book to their students and friends. We hope, that they will continueto patronise this book in the future also.
2. Kinematics of Motion
3. Kinetics of Motion
4. Simple Harmonic Motion
5. Simple Mechanisms
6. Velocity in Mechanisms (Instantaneous Centre Method)
7. Velocity in Mechanisms (Relative Velocity Method)
8. Acceleration in Mechanisms
9. Mechanisms with Lower Pairs
11. Belt, Rope and Chain Drives
12. Toothed Gearing
13. Gear Trains
14. Gyroscopic Couple and Precessional Motion
15. Inertia Forces in Reciprocating Parts
16. Turning Moment Diagrams and Flywheel
17. Steam Engine Valves and Reversing Gears
19. Brakes and Dynamometers
21. Balancing of Rotating Masses
22. Balancing of Reciprocating Masses
23. Longitudinal and Transverse Vibrations
25. Computer Aided Analysis and Synthesis of Mechanisms
26. Automatic Control
JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY
II Year B.Tech EEE I-Sem
ELECTRICAL MACHINES – I
Electrical machines course is one of the important courses of the Electrical discipline. In this course the different types of DC generators and motors which are widely used in industry are covered and their performance aspects will be studied.
UNIT – I Electromechanical Energy Conversion
Electromechanical Energy conversion – forces and torque in magnetic field systems – energy balance – energy and force in a singly excited magnetic field system, determination of magnetic force – co-energy – multi excited magnetic field systems.
UNIT – II D.C. Generators – Construction & Operation
D.C. Generators – Principle of operation – Action of commutator – constructional features – armature windings – lap and wave windings – simplex and multiplex windings – use of laminated armature – E. M.F Equation – Problems
UNIT – III Armature reaction in D.C. Generator
Armature reaction – Cross magnetizing and de-magnetizing AT/pole – compensating winding – commutation – reactance voltage – methods of improving commutation.
UNIT – IV Types of D.C Generators
Methods of Excitation – separately excited and self excited generators – build-up of E.M.F – critical field resistance and critical speed – causes for failure to self excite and remedial measures.
UNIT – V Load Characteristics of Generators
Load characteristics of shunt, series and compound generators – parallel operation of d.c series generators – use of equalizer bar and cross connection of field windings – load sharing.
UNIT – VI D.C. Motors
D.C Motors – Principle of operation – Back E.M.F. – Torque equation – characteristics and application of shunt, series and compound motors – Armature reaction and commutation.
UNIT – VII Speed control of D.C. Motors
Speed control of d.c. Motors: Armature voltage and field flux control methods. Ward-Leonard system.
Principle of 3 point and 4 point starters – protective devices.
UNIT – VIII Testing of D.C. Machines
Testing of d.c. machines: Losses – Constant & Variable losses – calculation of efficiency – condition for maximum efficiency
Methods of Testing – direct, indirect and regenerative testing – brake test – Swinburne’s test – Hopkinson’s test – Field’s test – Retardation test – separation of stray losses in a d.c. motor test.
1. Electric Machinary – A. E. Fritzgerald, C. Kingsley and S. Umans, Mc Graw-Hill Companies, 5th editon
2. Electrical Machines – P.S. Bimbra., Khanna Publishers
- Performance and Design of D.C Machines – by Clayton & Hancock, BPB Publishers
- Electrical Machines -S.K. Battacharya,
- Electric Machines by I.J. Nagrath & D.P. Kothari, Tata Mc Graw – Hill Publishers, 3rd
- Electromechanics – I (D.C. Machines) S. Kamakshaiah Hi-Tech Publishers.