UNIT I INTRODUCTION

1.1 Major considerations in Electrical Machine Design - Electrical Engineering Materials – Space factor

1.2 Choice of Specific Electrical and Magnetic loadings

1.3 Thermal considerations - Heat flow –Temperature rise and Insulating Materials

1.4 Rating of machines - Standard specifications

UNIT II DC MACHINES

2.1 Output Equations - Main Dimensions – Choice of Specific Electric and Magnetic Loading

2.2 Magnetic Circuits Calculations - Carter’s Coefficient - Net length of Iron –Real & Apparent flux densities

2.3 Selection of number of poles - Design of Armature – Design of commutator and brushes

2.4 Performance prediction using design values

UNIT III TRANSFORMERS

3.1 Output Equations – Main Dimensions - kVA output for single and three phase transformers

3.2 Design of core and winding – Overall dimensions

3.3 Operating characteristics – No load current

3.4 Temperature rise in Transformers

3.5 Design of Tank and Methods of cooling of Transformers

UNIT IV INDUCTION MOTORS

4.1 Output equation of Induction motor – Main dimensions – Choice of Average flux density – Length of air gap- Rules for selecting rotor slots of squirrel cage machines

4.2 Design of rotor bars & slots – Design of end rings – Design of wound rotor

4.3 Magnetic leakage, losses and efficiency – Leakage reactance of polyphase machines- Magnetizing current - Short circuit current

4.4 Operating characteristics - Losses and Efficiency.

UNIT V SYNCHRONOUS MACHINES

5.1 Output equations – choice of Electrical and Magnetic Loading

5.2 Design of salient pole machines – Short circuit ratio – shape of pole face

5.3 Armature design – Armature parameters – Estimation of air gap length

5.4 Design of rotor – Design of damper winding – Determination of full load field mmf –Design of field winding

5.5 Design of turbo alternators – Rotor design