Energy Conversion Principle: Magnetic field, Field energy, Mechanical forces and torques in singly-excited and doubly-excited systems, Electric field.

 

Rotating Machines: Concepts of reluctance and electromagnetic torques, Concept of transformer and speed e.m.f`s. and torque in round-rotor machines.

 

Transformers: Theory and operation, Phasor diagram, Equivalent circuit, Open circuit and short circuit tests, Regulation, Performance estimation, Auto-transformers, Parallel operation, Three phase transformer connections, Instrument transformers: Current Transformer (CT) and potential transformer (PT); Pulse transformers.

 

DC Machines: Methods of excitation, Magnetization and operating characteristics of generators, Starters, Speed-torque characteristics of DC motors. Speed control, Losses and efficiency. PM motors.

 

Induction Machine: Induction motor principle and applications as stepper and brushless motors, Induction motor equivalent circuit, Torque-slip characteristics, Methods of starting, Speed control of 3-phase induction motor.

 

Polyphase Synchronous Machines: MMF and EMF phasor, Concept of synchronous reactance, Regulation by EMF and MMF methods, Synchronous motor starting and V-curves.

 

Laboratory Work: DC machines: Constructional features, Characteristics of generators and motors, Speed control, Efficiency. Transformers: Open and short circuit tests, Parallel operation, Harmonics in no-load current.

 

Induction Machines: No load and Blocked rotor tests, Starters. Synchronous Machines: Regulation calculation by EMF method.

Text Books

1. Bimbhra, P.S., Electrical Machinery, Khanna Publishers (2008) 2^nd ed.
2. Mukherjee, P.K. and Chakravorty, S., Electrical Machines, Dhanpat Rai and Co. (P) Ltd. (2004) 2^nd ed.
3. Nagrath, I.J and Kothari, D.P., Electric Machines, Tata McGraw Hill (2004) 3^rd ed.

 

Reference Books

1. Bimbhra, P.S., Generalized Theory of Electrical Machines, Khanna Publishers (2007) 5^th ed.
2. Toro, Vincert, Electromechanical Devices for Energy Conversion, Prentice Hall of India  (2004) 2^nd ed.
3. Fitzgerald, A.E., Kingsley, C. Jr, and Umans, Stephen, Electric Machinery, McGraw Hill (2002) 6^th ed.