7EE6.2 COMPUTER AIDED DESIGN OF ELECTRICAL MACHINES

Unit-1

Basic Principles of Electrical Machine Design:

Specifications, Factors affecting the design,

Limitations, main dimension, loadings, output equation, factor affecting the size and rating,

Electrical Engineering Materials: conducting, magnetic and insulating materials.

Magnetic

Circuit Calculation:

Ohm’s law for magnetic circuit, mmf required for air gap and iron parts,

tapered teeth, real and apparent flux density, magnetizing current.

Unit-2

Heating and Cooling of Electrical Machines:

heat dissipation and heat flow equations,

Newton’s law of cooling, equations for temperature rise,

Rating of Machines

: Continuous,

short and intermittent ratings, mean temperature rise, hydrogen cooling of turbo alternators,

quantity of cooling medium.

Unit-3

Computer Aided Design of Transformers:

Power and Distribution Transformers, core and

yoke cross sections, square and stepped core, output equations, main dimensions, types &,

design of windings, optimization concepts.

Unit-4

Computer Aided Design of Synchronous Machines:

Turbo and Hydro alternators, choice of

specific magnetic & electric loading, short circuit ratio and its effects, air gap length, output

equation, main dimensions, flow charts for design of synchronous machine, design of stator

core & winding.