ELECTRICAL MACHINE DESIGN
UNIT I MAGNETIC CIRCUITS AND COOLING OF ELECTICAL
Concept of magnetic circuit – MMF calculation for various types of electrical machines –
Real and apparent flux density of rotating machines – Leakage reactance calculation for
transformers, Induction and synchronous machine – Thermal ratings Continuous, Short
time and Intermittent – Direct and Indirect cooling methods – Cooling of turbo alternators
UNIT II D.C. MACHINES 9
Constructional details – Winding design – Output equation – Main dimensions – Choice of
specific loadings – Choice of number of poles – Armature design – Design of field poles
and field coil – Design of commutator and brushes – Losses and efficiency calculations
UNIT III TRANSFORMERS 9
Constructional details of core and shell type transformers – Amorphous Cores – Output
rating of single phase and three phase transformers – Optimum design of transformers –
Design of core, Yoke and windings for core and shell type transformers – Equivalent
circuit parameter from design data – Losses and efficiency calculations – Design of tank
and cooling tubes
UNIT IV THREE PHASE INDUCTION MOTORS 9
Constructional details of squirrel cage and slip ring motors – Output equation – Main
dimensions – Choice of specific loadings – Design of stator – Design of squirrel cage and
slip ring rotor – Equivalent circuit parameters from design data – Losses and efficiency
UNIT V SYNCHRONOUS MACHINES 9
Constructional details of cylindrical pole and salient pole alternators – Winding design –
Output equation – Choice of specific loadings – Main dimensions – Short circuit ratio –
Design of stator and rotor of cylindrical pole and salient pole machines – Design of field
coil – Performance calculation from design data – Introduction to computer aided design
L: 45 T: 15 Total: 60
1. A.K. Sawhney, “A Course in Electrical Machine Design”, Dhanpat Rai and Sons,
New Delhi, 6th Edition, 2006
2. S.K. Sen, “Principles of Electrical Machine Design with Computer Programmes”,
Oxford and IBH Publishing Co. Pvt Ltd., New Delhi, 1987
1. R.K. Agarwal, “Principles of Electrical Machine Design”, S.K.Kataria & Sons,
2. V.N. Mittle and A. Mittle, “Design of Electrical Machines”, Standard Publications
& Distributors, Delhi, 2002
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