2K6ME 304 ELECTRICAL MACHINES
Module I (12 hours)
DC Generators EMF equation – Armature reaction – Power flow diagram voltage build up- Internal and external characteristics – Control of terminal voltage DC Motors: Back EMF – Torque and speed equations- Power flow diagram- Losses – componentsefficiency- Performance characteristics – Starting method using 3 point starter- Speed control.
Module II (14 hours) .
Transformers: Ideal and real transformer – Equivalent circuit – Phasor diagram – Losses – efficiency and regulation – All day efficiency – OC and SC tests- Auto transformers – Voltage and current relationships – Saving of copper – Three phase transformers- Star and Delta connections . 3 phase induction motors -Production of torque – slip and frequency of rotor current – torque slip characteristics- no-load and blocked rotor tests- equivalent circuit -losses and power flow.
Module III (13 hours)
Starting methods for three phase induction motors – direct on line starting – auto transformer starting – star delta starting – rotor resistance starting Alternators – Voltage regulation – predetermination – EMF method – MMF method – Synchronizing with 3 phase mains Control of Permanent magnet stepper motors
Module IV (13 hours)
Electrical drives: advantages of electrical drives – parts of electrical. drives – choice of electric drives – status of DC and AC drives – dynamics of electric drives’ – fundamental torque equations – multiquadrant operation – equivalent values of drive parameters – components of load torque – nature and classification of load torque. Electrical drives: power semiconductor device- SCR – symbol and characteristics – input-output characteristic of AC to DC,. AC to AC and DC to DC converters (no derivation) – three phase induction motor drives- stator voltage control and slip power recovery scheme.
Text books
1. A Text Book of Electrical Technology- B.L. Thereja, A.K.Thereja for Module 1-3
2. Dubey et.al , Thyristorised power controllers, Narosa publications. for Module 4
Reference books
1. Nagarath I. J. & Kothari. D. P.; Electric Machines, Tata McGraw Hill
2. Stephen J Chapman, Electric Machinery Fundamentals, McGraw Hill.
3. Tara V.D., Electrical Machines & Power Systems, Prentice Hall.
4. Fitzgerald A.E. & Kingsley, Electrical ¥achinery, McGraw Hill.
5. Puchestein, Lloyd & Cenrad, Alternatirig Current Machines, Asia Publishing House.
6. Vincent Del Toro, Electrical Machines and Power Systems, Prentice Hall
7. M.D and Kanchandani K.B., Power Electronics, Tata Mc Graw Hill.
8.Electric Drives – N.K.De and P.K. Sen , Prentice Hall of India.