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Induction Motors
Working Principle, Theory of rotating
Magnetic Field,polyphase supply, slip,
torque slip characteristic & effect of rotor
resistance on T, equivalent circuit, phasor
diagram, performance calculation, no load &
blocked rotor test, Starters- DOL, Star-Delta
& rotor resistance starter, Double cage IM,
Single Phase IM, Double revolving field
theory, equivalent circuit and Types
Faculty of ECE,INA
Synchronous Machines
Construction features, cooling, armature
winding ,regulation of alternators,
synchronous impedance, MMF & potier(zpf)
method of V regulation, synchronization and
parallel Operation. Salient pole synchronous
machines, synchronous motors, power angle,
characteristic, synchronizing torque ,power,
hunting, damping, starting of Synchronous
motor, effect of saliency, reluctance torque.
AC Commutator Motors
Universal motors, Repulsion motors,
Schrage motors. Introduction to Energy
efficient motors and conversion motors.
Text Books
Electrical Technology I&II by BL Theraja
Electrical Machine- SK Bhattacharya
Faculty of ECE,INA 4
3- Induction Motor ɸ
Motor:- A machine which converts L
energy to mechanical energy.
Induction Motor:- A motor whose working
phenomenon involves Electromagnetic
Induction. Remember DC motors are
called conduction motors. Tell me why?
3- Induction Motor:- ɸ An Induction motor
with 3 Windings in Stator & Rotor
Construction
An induction motor has two
main parts:-
A Stationary Stator
consisting of a steel frame
that supports a hollow,
cylindrical core,
constructed from stacked
laminations (why?), having
a number of evenly spaced
slots, providing the space
for the stator winding
Construction
A Revolving Rotor composed of punched
laminations, stacked to create a series of
rotor slots, providing space for winding
Two basic design types
Squirrel-Cage
Conducting bars laid
into slots and shorted
at both ends by
shorting rings.
Construction
Phase Wound
Complete set of three-phase
windings exactly as the
stator.
The ends of the three rotor
wires are connected to 3 slip
rings on the rotor shaft.
In this way, the rotor circuit
is accessible.