Course Outline

1.2
Slight Skew

1- it helps to make the motor run quietly by reducing the magnetic hum
2- Reducing Air Gap and Cogging
3- Increasing R, rugged
4- increase in the effective ratio
of transformation between
stator and rotor (K)
5- increased impedance of the
machine at a given slip
6- increased slip for a given
torque.2

Reference: Electrical Engineering

By
Theraja

Volume - II AC& DC Machines
3- principle operations of (SG, SM)

2

Syllabus

Induction Machine:
?2
INDUCTION MOTOR

Classification of A.C. Motors
1- Regards As Their Principle Of Operation :

Asynchronous

induction

Squirrel cage Slip-ring

commutator

series shunt repulsion
Synchronous

10

????DC. motor

in AC motors, the rotor does not
receive electric power by conduction
but by induction in exactly the same
way as the secondary of a 2-winding
transformer receives its power from the
primary

Induction

12

?.Induction Motors:

-Principle of operation
-Constructional details
-Type of IM

?Induction Generators:
-Principle of operation
Midterm Exam (third week in November)

Synchronous:
? 2

In DC. motors, the electric power is
conducted directly to the armature (i.e.
rotating part) through brushes and
commutator
can be called a conduction motor.Introduction to AC Machinery
Principles
2- principle operations of (IM, IG)

?.This rotating field induces currents in the rotor by electromagnetic induction

p

f Ns

120
?2

b) Rotor

i) Squirrel-cage rotor

(90%)
oThe cage is constructed from
rotor bars (generally copper),
o The bars are then shorted
together with end rings at either
end
o There are no slip rings nor any

simplest and most rugged

15

?.Synchronous Motors:

-Principle of operation

3 ?.2
Why Induction motor

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