The document provides information about the course EEE 4391 - Electrical and Electronics Technology. It discusses the contact hours, credit hours, reference books, course teachers, and course syllabus. The syllabus covers electrical machines including transformers, DC generators, DC motors, AC machines, and electronics topics such as semiconductors, transistors, and transducers. It also provides more detailed content on DC generators, including their principle of operation, construction, types, and applications.

1. Course Code: EEE 4391
Course Title: Electrical and Electronics Technology
Contact Hour: 3.00, Credit Hour: 3.00
Reference Books:
1. ATest Book of Electrical Technology (AC and DC Machines)-B.L. Theraja andA.K. Theraja
2. Direct andAlternating Current – Rosenblatt and Friedman
3. Electric Machinery Fundamentals – Stephen J. Cahpman
Course Teacher:
1. Md. Abu Bakar Siddik (ABS), Assistant Professor, Department of AE (Avionics)
2. Sqn. Ldr. Tasmihir Islam Tithi (TIT), Department of AE (Avionics)

2. Syllabus
Electrical Machines Part:
Single phase transformer-equivalent circuit and laboratory testing, introduction to three
phase transformers. DC generator: principle, types, performances and characteristics. D C
Motor: principles, types of motor, performances, speed control, starters and characteristics.
A C Machines: three phase induction motor principles, equivalent circuit. Introduction to
synchronous machines and fractional horsepower motors.
Electronics Part:
Semiconductor diode, transistor characteristics, equivalent circuits, self-biasing circuits,
emitter-follower amplifiers, push-pull amplifier. Introduction to silicon-controlled rectifier
and its application. Oscilloscope. Transducers: strain, temperature, pressure, speed and
torque measurements.

3. DC GENERATOR

4. CONTENT
NO TOPIC NAME
1 INTRODUCTION
2 PRINCIPLE OF OPERATION
3 DC GENERATOR
4 CONSTRUCTION & WORKING
5 TYPES & APPLICATION
6 REFERENCE

5. Introduction
Machine: The device which converts electrical energy into mechanical energy or
mechanical energy into electrical energy is called machine.
Engine: The device which converts chemical energy into mechanical energy is called
engine.
Machine
Generator Motor
Generator: The machine which converts mechanical energy into electrical energy is
called generator.
Motor: The machine which converts electrical energy into mechanical energy is called
motor.

6. Generator: The machine which converts mechanical energy into electrical energy is called
generator.
 There are 2 type of electric generator :
1. AC generator - Produce alternating current
2. DC generator - Produce unidirectional/direct current.
 Hence the most essential part of generator are :
1. A uniform magnetic field
2. A system of conductors
3. Relative motion between the magnetic field
and conductors
 These generator produces current based on the fundamental of principle
of faraday’s law of electromagnetic induction.
DC Generator

8. PRINCIPLE OF OPERATION
 FARADAYS LAWS
Whenever a conductor cuts magnetic flux, an e.m.f is induced in that conductor.
and if the conductor is a closed circuit then induced current flows through it.

9.  FLEMING’S RIGHT HAND RULE
 The direction of induced current can be determined by Fleming’s Right hand rule.
- The thumb represent the direction of motion of the conductor.
- The first finger ( four finger ) represent field.
- The second finger ( middle finger ) represent current.
PRINCIPLE OF OPERATION

10. PRINCIPLE OF OPERATION

11. DC GENERATOR

12. DC GENERATOR

15. CONSTRUCTION OF DC
GENERATOR
 DC Generator consist of a few part, which is :
1. Yoke
-Yoke is also call as frame.It provides protection to the
rotating and other parts of the machine from moisture,dust etc.
-Yoke is an iron body which provide the part for
flux and mechanical support for the pole.
2. Pole
-Carry the field winding
-Rectangle cross section
-Laminated to reduce eddy
current losses
3. Field winding
-Is a set of coil
-DC current flow through these to produce the
required magnetic field.

16. 4. Armature Core
-All these slots are parallel to the shaft axis.
-Armature conductor are placed in these slots.
-Armature core provides a low reluctance path to the flux produced by the field winding.
-Cast steel or cast iron are used for the armature core.
Armature Winding: The slots of the armature core hold insulated conductors that are connected in a
suitable manner. These conductors are known as armature winding. The conductor in the armature
are connected in series-parallel; the conductor being connected in series to increase the voltage and
in parallel to increase the current.
Split Ring Commutator
- The split ring commutator is mounted on the armature shaft but is insulated from it.
- The commutator converts the alternating emf generated internally in a D.C. voltage.
- It collects the current from the armature conductors and passes it to the external
load via brush.
4. Brush
- These connect the commutator to an external circuit and conduct the current induced in the

18. TYPES OF DC GENERATOR.

19. ACCORDING TO THE WAY OF FIELD EXCITATION
1. Separately Excited DC Generator
– The field winding is excited from dedicated DC supply
i.e : Battery
2. Self Excited DC Generator
- The field winding is excited from the armature.
No need separate DC supply.
ACCORDING TO THE CONNECTION OF FIELD WINDING
WITH RESPECT TO ARMATURE WINDING
1. Shunt Generator
- The field winding is connected in parallel with
armature winding
- Application : Lighning load, Battery charging,
Use for giving excitation to the
alternator

20. 2. Series Generator
- Field winding is connected in series with the armature.
- Application : For arc lamp, As constant current generator,
As booster on DC generator
3. Compound Generator
- Both series and shunt winding are used to get combined
characteristic of two types of generator.
- Application : Use for driving a motor, for small
distance operation (power supply for
hotel, office & home)
- Short Shunt : Only shunt field winding is in parallel with armature winding.
- Long Shunt : Shunt field winding is in parallel with both series field & armature winding.

21. THANK YOU