Electrical Machines 1 Pdf Notes – EM 1 Notes | Free Lecture Notes download


Here you can download the free lecture Notes of Electrical Machines 1 Pdf Notes – EM 1 Pdf Notes materials with multiple file links to download. The Electrical Machines 1 Notes Pdf – EM 1 Notes Pdf book starts with the topics covering Electromechanical Energy conversion, Construction & Operation, Generator:Armature reaction, separately excited and self excited generators, Load characteristics of shunt, Principle of operation, Speed control of d.c. Motors, Testing of d.c. machines: Losses, Etc.

Electrical Machines 1 Pdf Notes, EM 1 Pdf Notes, Electrical Machines 1 Notes Pdf, EM 1 Notes Pdf, electrical machines pdf free download.
Electrical Machines 1 Pdf Notes – EM 1 Pdf Notes

Electrical Machines 1 Pdf Notes – EM 1 Pdf Notes

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Complete Notes

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Unit 1

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Unit 2

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Unit 3

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Unit 4

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Unit 5

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Complete Notes

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Unit 1

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Unit 2

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Unit 3

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Unit 4

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Unit 5

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Note :- These notes are according to the r09 Syllabus book of JNTUH.In R13 & R15,8-units of R09 syllabus are combined into 5-units in r13 syllabus.Click here to check all the JNTU Syllabus books


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.


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


Armature reaction in D.C. Generator:Armature reaction – Cross magnetizing and de-magnetizing AT/pole – compensating winding – commutation – reactance voltage – methods of improving commutation.


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.

Electrical Machines 1 Notes Pdf – EM 1 Notes Pdf

Electrical Machines Pdf Notes


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.


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.


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.


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. Performance and Design of D.C Machines – by Clayton & Hancock, BPB Publishers
2. Electrical Machines -S.K. Battacharya,
3. Electric Machines by I.J. Nagrath & D.P. Kothari, Tata Mc Graw – Hill Publishers, 3rd edition, 2004.
4. Electromechanics – I (D.C. Machines) S. Kamakshaiah Hi-Tech Publishers.

Text books

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

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