Fundamentals of Magnetic circuits- Statically and dynamically induced EMF - Principle of electromechanical energy conversion forces and torque in magnetic field systems- energy balance in magnetic circuits- magnetic force- co-energy in singly excited and multi excited magnetic field system
Construction and principle of operation – EMF equation –Types – Methods of excitation – No load and load characteristics of DC generators – Armature reaction and commutation. Principle of operation of DC motor, Significance of back EMF – Torque equation– Characteristics of DC motors
Necessity of Starter - Starting methods – Speed control Methods Testing of DC machines- Brake test, Swinburne’s test – Losses and efficiency –Applications of DC Machines
Construction and principle of operation of single phase transformer – types – EMF equation – Transformer on no load and load – Phasor diagrams – Equivalent circuit -Auto transformer Construction and principle of operation of three phase transformer-three phase transformers connections
Polarity test – Open circuit and Short circuit tests-Voltage regulation-Losses and efficiency – all day efficiency. Applications: Instrument, Isolation, Distribution and Power Transformers
Reference Book:
1 A. E. Fitzgerald and C. Kingsley, "Electric Machineryâ€, New York, McGraw Hill Education, 6th Edition 2017. 2 A. E. Clayton and N. N. Hancock, “Performance and design of DC machinesâ€, CBS Publishers, 2018. 3 Deshpande M. V., “Electrical Machines†PHI Learning Pvt. Ltd., New Delhi, 2011 4 P.S. Bimbhra, ‘Electrical Machinery’, Khanna Publishers, 2003.
Text Book:
1 I. J. Nagrath and D. P. Kothari, “Electric Machinesâ€, McGraw Hill Education, 5th Edition, 2017. 2 P. S. Bimbhra, “Electric Machineryâ€, Khanna Publishers, 2nd Edition, 2021. 3 K. Murugesh Kumar, “D.C Machines and Transformers†Vikas publishing house private limited, New Delhi. 2010.
