BEE 601

DESIGN OF ELECTRICAL MACHINES

OBJECTIVE: The student will be able to design the main dimensions and other major parts of transformer and d.c. and a.c. rotating machines.

1. FUNDAMENTALS OF DESIGN


General concepts in the design of rotating machines - Output equation - Magnetic and electric loadings - Common design features of all rotating machines - Conducting, insulating and magnetic materials used in electrical apparatus - mmf calculation for the magnetic circuit of rotating machines - Leakage reactance calculation. CAD tools for electrical machine design.

2. D.C. MACHINES


Armature winding - Output equation - Choice of specific loadings - Choice of poles - design of conductors, winding, slot, air gap, field poles and field coils, commutator and brush - Predetermination of efficiency, temperature rise and open circuit characteristics from design data (qualitative treatment only)

3. TRANSFORMERS


Output equation - Design of core and coils for single phase and three phase transformers - Design of tank and cooling tubes - Predetermination of circuit parameters, magnetising current, losses, efficiency, temperature rise and regulation from design data (Qualitative treatment only)

4. INDUCTION MOTORS


Output equation - Choice of specific loadings - Design of stator - Design of squirrel cage and slip ring rotors - Stator and rotor winding designs - Predetermination of circuit parameters, magnetising current, efficiency and temperature rise from design data (Qualitative treatment only).

5. SYNCHRONOUS MACHINES


Constructional features - SCR - Output equation - specific loadings - Main dimensions - Stator design - Design of salient pole field coil.