__EE3405__

__ELECTRICAL MACHINES - II__

**COURSE OBJECTIVES:**

To
impart knowledge on the following Topics

•
Construction and performance of salient and non-salient type synchronous
generators.

•
Principle of operation and performance of synchronous motor.

•
Construction, principle of operation and performance of induction machines.

•
Starting and speed control of three-phase induction motors.

•
Construction, principle of operation and performance of single phase induction
motors and special machines.

**UNIT I**

**SYNCHRONOUS GENERATOR**

Constructional
details - Types of rotors -winding factors- EMF equation - Synchronous
reactance - Armature reaction - Phasor diagrams of non-salient pole synchronous
generator connected to infinite bus--Synchronizing and parallel operation
Synchronizing torque -Change of excitation and mechanical input- Voltage
regulation - EMF, MMF, ZPF and A.S.A method steady state power- angle
characteristics- Two reaction theory -slip test -short circuit transients -
Capability Curves.

**UNIT II**

**SYNCHRONOUS MOTOR**

Principle
of operation - Torque equation - Operation on infinite bus bars - V and
Inverted V curves - Power input and power developed equations - Starting
methods - Current loci for constant power input, constant excitation and
constant power Developed-Hunting - natural frequency of oscillations - damper
windings- synchronous condenser.

**UNIT III **

**THREE PHASE INDUCTION MOTOR**

Constructional details - Types of rotors - Principle
of operation Slip -cogging and crawling- Equivalent circuit - Torque-Slip
characteristics - Condition for maximum torque - Losses and efficiency Load
test - No load and blocked rotor tests - Circle diagram - Separation of losses
- Double cage induction motors -Induction generators - Synchronous induction
motor.

**UNIT IV**

**STARTING AND SPEED CONTROL OF THREE PHASE INDUCTION MOTOR **

Need
for starting - Types of starters - DOL, Rotor resistance, Autotransformer and
Star delta starters - Speed control - Voltage control, Frequency control and
pole changing - Cascaded Connection-V/f control Slip power recovery
Scheme-Braking of three phase induction motor: Plugging, dynamic braking and
regenerative braking.

**UNIT V**

**KNOWLED SINGLE PHASE INDUCTION MOTORS AND SPECIAL MACHINES **

Constructional
details of single phase induction motor - Double field revolving theory and
operation - Equivalent circuit - No load and blocked rotor test - Performance
analysis - Starting methods of single-phase induction motors - Capacitor-start
capacitor run Induction motor- Shaded pole induction motor - Linear induction
motor - Repulsion motor - Hysteresis motor - AC series motor- Servo motors-
Stepper motors - introduction to magnetic levitation systems.

**TOTAL:
45 PERIODS**

** **

**COURSE OUTCOMES:**

Upon
the successful completion of the course, students will have the:

**CO1:**
Ability to understand the construction and working principle of Synchronous
generator

**CO2:**
Ability to understand the construction and working principle of Synchronous
Motor

**CO3:**
Ability to understand the construction and working principle of Three Phase
Induction Motor

**CO4:**
Acquire knowledge about the starting and speed control of induction motors.

**CO5:**
To gain knowledge about the basic principles and working of Single phase
induction motors and Special Electrical Machines.

**TEXT BOOKS:**

1.
A.E. Fitzgerald, Charles Kingsley, Stephen. D. Umans, 'Electric Machinery', Mc
Graw Hill publishing Company Ltd, 6th Education 2017.

2.
Stephen J. Chapman, 'Electric Machinery Fundamentals'4th edition, McGraw Hill Education
Pvt. Ltd, 4th Edition 2017.

3.
D.P. Kothari and I.J. Nagrath, 'Electric Machines', McGraw Hill Publishing
Company Ltd, 5th Edition 2017

4.
P.S. Bhimbhra, 'Electrical Machinery', Khanna Publishers, edition 2, 2021.

**REFERENCES**

1.
Vincent Del Toro, 'Basic Electric Machines' Pearson India Education, 2016.

2.
M.N. Bandyo padhyay, Electrical Machines Theory and Practice, PHI Learning PVT
LTD., New Delhi, 2011.

3.
B.R.Gupta, 'Fundamental of Electric Machines' New age International Publishers,
3rd Edition, Reprint 2015.

4.
Murugesh Kumar, 'Electric Machines', Vikas Publishing House Pvt. Ltd, First
edition 2010. 5. Alexander S. Langsdorf, 'Theory of Alternating-Current
Machinery', McGraw Hill Publications, 2001.