Section 5-2:
Equivalent Circuit
1
Equivalent Circuit
The induction motor is similar to the transformer with the exception that its
secondary windings are free to rotate.
Stator Circuit
Rotor Circuit
2
Induced Voltage in Rotor (Revision)
When the rotor i
Section 4-1:
Principles and Construction of DC Machines
1
Objectives
to understand the principles and construction of DC machines (generator
and motor).
to analyze the equivalent circuit model of DC machines.
2
Structure of DC Machine
Stator houses fie
Section 5-3:
Torque-Speed Characteristics
DC test, No-load Test and Blocked Rotor Test
1
Torque-Speed Characteristics
(1)
Thevenins theorem can be used to transform the network to the left of
points a and b into an equivalent voltage source VTH in series
Section 4-2:
Classification of DC Generators
1
Magneto Motive Force
When current flows through coil, Magnetic Motive Force (MMF) is
generated.
MMF drives flux through the core against the reluctance.
Ferromagnetic Core
with Winding
2
Residue Magnetism (
EET2166
Chapter 2: Transformers
Chapter 2: TRANSFORMERS
2.1
INTRODUCTION
The transformer is basically a static device in which two or more stationary electric circuits
are coupled magnetically, the windings being linked by a common time-varying magnetic f
EET2166 - INTRODUCTION TO ELECTRICAL POWER AND MACHINES
Chapter 4
Chapter 4: DC Machines
Objectives
to understand the principles and construction of DC machines (generator and motor).
to analyze the equivalent circuit model of DC machines.
PRINCIPLE OF
Section 4-3:
DC Motors and Speed Control
1
DC Motors
DC motor and DC generator have similar construction.
Same DC machine can act as a motor or a generator.
In a generator, the induced voltage E is grater than the terminal voltage Vt.
In a motor, EMF