JNTUK B.Tech Electrical Machines – I R13 Syllabus for Engineering it gives you detail information about Electrical Machines – I syllabus.
Preamble
This is a basic course on rotating electrical machines. This course covers the topics related to principles, performance, applications and design considerations of dc machines.
Learning objectives
- Appreciate the principles of electromagnetic energy conversion and understand the construction details of DC machine.
- Understand the principle of operation and performance of DC generators.
- Learn the characteristics and performance of DC generators.
- Learn the characteristics and performance of DC motors.
- Learn the speed control and testing methods of DC motors.
- Learn the basic ideas of design of DC machines.
UNIT–I : Electro mechanical Energy Conversion
Introduction to S.I Units – principles of electro mechanical energy conversion – forces and torque in magnetic field systems – energy balance- singly excited machine- magnetic force – co-energy – multi excited magnetic field system-construction features of conventional and modern DC machines.
UNIT–II : D.C. Generators – I
Principle of operation – E.M.F equation- armature windings – lap and wave windings – armature reaction –cross magnetizing and de-magnetizing AT/pole –commutation process – methods of improving commutation – compensating windings – Interpoles.
UNIT–III: D.C. Generators – II
Methods of excitation- self excited and separately excited-types of generators build-up of emf – open circuit characteristics-critical field resistance-critical speed-causes for failure to self excitation-remedial measures – Internal and external characteristics of separately excited, shunt, series, compound generators-applications, losses and efficiency.
UNIT–IV : D.C. Motors
Principle of operation – back E.M.F – torque equation –characteristics of shunt, series and compound motors – armature reaction and commutation – losses and efficiency- speed torque characteristics-applications of dc motors. Starting by 3 point and 4 point starters – protective devices.
UNIT-V: Speed Control and Testing of D.C. Machines
Speed control by armature voltage and field flux control – testing of DC machines – brake test, Swinburne’s method – principle of regenerative or Hopkinson’s method – retardation test — separation of losses – methods of electrical braking: plugging, dynamic and regenerative.
UNIT–VI: Design of D.C. Machines
Design concept – output equation – choice of specific electric and magnetic loadings – separation of D and L – estimation of number of conductors/ turns – coils – armature slots – conductor dimension – slot dimension – choice of number of poles – length of air gap.
Learning outcomes
- Able to explain the concepts of electromagnetic energy conversion.
- Able to explain the operation of dc generator, armature reaction and commutation.
- Able to analyze the characteristics and performance of dc generators.
- Able to explain the torque developed and performance of dc motors.
- Able to analyze the speed control and testing methods of dc motors.
- Able to propose design aspects of a dc machine.
TEXT BOOKS
- Electrical Machines – P.S. Bhimbra, Khanna Publishers
- Electric Machinery by A.E.Fitzgerald,Charles kingsley,Stephen D.Umans, TMH
REFERENCE BOOKS
- Theory & Performance of Electrical Machines by J.B.Guptha. S.K.Kataria & Sons.
- Electrical Machines by R.K. Rajput, Lakshmi publications, 5th edition.
- The Performance and Design of DC machines – Albert E. Clayton.
- Electrical Machine Design by A.K. Sawhney, Dhanpat Rai & Sons publications.
- Electric Machines by Mulukutla S.Sarma&Mukesh K.Pathak, CENGAGE Learning.
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