Constructional details – Types of rotors – EMF equation – Synchronous reactance – Armature reaction – Phasor diagrams - Voltage regulation – EMF, MMF, and ZPF methods - Synchronizing and parallel operation – Synchronizing torque -Change of excitation and mechanical input – Two reaction theory –slip test
Principle of operation – Torque equation – Operation on infinite bus bars - V and Inverted V curves – Power input and power developed equations – Starting methods , hunting –damper windings- synchronous condenser – application using design thinking
Constructional details – Types of rotors –- Principle of operation – Slip –cogging and crawling- torque, condition for maximum torque , slip -torque characteristics – Losses and efficiency – Load test - No load and blocked rotor tests - Equivalent circuit – Separation of no load losses
Need for starting, concepts –remote operated DOL starter – Speed control techniques - Voltage, V/f control– Braking : Plugging, dynamic braking and regenerative braking Constructional details of single phase induction motor – Double field revolving theory and operation – Starting methods – All Capacitor Induction motors
Operation and Application of Special Machines: Double cage induction motor –Induction generator – Synchronous induction motor - Shaded pole induction motor - Linear induction motor – Repulsion motor –Reluctance motor -SRM motor - stepper motor - AC series motor- BLDC motor- servo motor. Magnetic levitation systems - case study using design thinking.
Reference Book:
1.A.E. Fitzgerald, Charles Kingsley, Stephen. D.Umans, ‘Electric Machinery’, Tata McGraw Hill publishing Company Ltd, 2013. 2. Charless A. Gross, “Electric Machines”, CRC Press, 2016. 3. K. Murugesh Kumar, “Induction and synchronous machines”, Vikas Publishing House Pvt. Ltd, 2016. 4. Syed A. Nasar, “Electric Machines and Power Systems: Volume I”, Mcgraw -Hill College; International Edition, January 2005. 5. M.N.Bandyopadhyay, “Electrical Machines Theory and Practice”, PHI Learning PVT LTD., New Delhi, 2017.
Text Book:
1.Gupta., “Theory and Performance of Electrical Machines”,. Katarina and Sons, 14th edition, 2018. (UNIT I - V) 2. D.P. Kothari and I.J. Nagrath, ‘Electric Machines’, Tata McGraw Hill Publishing Company Ltd, 2017. (UNIT I - V)