GTU:Electrical Engineering :Sem8: ELECTRICAL MACHINE DESIGN II

GUJARAT TECHNOLOGICAL UNIVERSITY
B.E. SEMESTER : VIII
ELECTRICAL ENGINEERING
Subject Name: ELECTRICAL MACHINE DESIGN II


Sr. No.
Course Contents
Total Hrs

1. Induction motor design:
Output equation, choice of specific scheme, separation of D
& L, peripheral Stator winding design, Calculation of no. of turns per phase,
conductor’s area shape of the stator slots, factors to be considered while deciding no of
stator slots, Area of stator slots, stator winding resistance, stator teeth design, depth of
the stator core, examples related to above topics, Length of the air gap.
Rotor design A. Squirrel cage rotor – selection of no. of rotor slots, harmonic induction
torque. Harmonic synchronous torque, vibration and noise, voltage ripples, rules for
selecting no. of rotor slots, Methods for reducing harmonic torque, design of rotor bars
and slots, calculation of rotor bar current, area of rotor bars, shape of rotor slots,
examples, Design of end rings, Calculation of end rings current, cross-sectional area of
end rings.
B. Design of wound rotor - calculation of number of rotor slots, no. of turns, crosssectional
area of rotor conductors, types of rotor windings, check for rotor tooth
density, design of rotor core, examples Estimation of operating characteristics- no load
current calculation, short circuit current calculation, stator and rotor resistance and
reactance calculation, examples, circle diagram, Dispersion coefficient – effect on
maximum output power factor
Performance calculation
Design aspects for large size machine, high voltage m/c, High speed m/c, algorithm and
flow chart Design of submersible motors
16


2. Design of single phase induction motor :
Types of motors, Design of main dimensions,
design of stator, Design of rotor, calculation of operating characteristic (rotor resistance,
stator resistance, iron loss, friction and windage loss etc, Design of auxiliary winding,
starting torque, circle diagram, design of capacitance for maximum torque
10
3. Synchronous machine design:
Introduction, output equations, Main dimension, SCR,
effect of SCR on machine performance Length of air gap and shape of pole face
Armature design, Armature winding (Single layer and double layer), number of
armature slots, slots dimension, length of mean turns, calculation of armature resistance
and reactance Design of rotor , Design of magnetic circuit, Open circuit characteristic
Determination of full load field MMF, Design of field winding Determination of direct
and Quadrature axis synchronous reactance Short circuit characteristics, Performance
evaluation Design of Turbo alternators, Main dimension, Length of air gap, Stator &
Rotor design Algorithms and Flow chart Design consideration for low speed alternators
and vertically operated alternator
16

Term work:
1. Design of 3 phase I.M
2. Drawing sheet of 3 phase I.M with circle dia
3. Drawing and description of syn. M/c components
4. Design of syn. m/c
5. Tutorials of single phase I.M and Submersible pumps


Books:
1. A Course in electrical machine design – A. K. Sawhey, Dhanpat Rai and Sons
2. Electrical machine design – R. K. Agrawal, S.K. Kataria & Sons
3. Design of Electrical machines – V. N. Mittle, Standard Publishers Distributors