M1: Module Descriptor Template
Module Code
Pre-requisite
Module codes
Co-Requisite
Modules
code(s)
ISCED
Code
Subject
Code
POWS3601
ECTS
Credits
NFQ Level
(CPD)#
5
Electrical Machines and Power Electronics
This Header should be repeated on each page of the Module
School Responsible: Electrical and Electronic Engineering
Module Title
Module Overview:
IThis module provides a foundation course on the most important ac electrical machines and power electronic
conversion circuits. The module investigates the behaviour of synchronous and induction machines. Suitable
electrical drives are investigated and the overall combination of drive and machine is addressed. The module also
investigates the implementation of power factor correction., basics of Power Electronic devices, switched mode
power conversion and inverter circuits and their operation
Learning Outcomes (LO): (to be numbered)
For a 5ECTS module a range of 4-10 LOs is recommended
On Completion of this module, the learner will be able to
1
Derive the equivalent circuit of a synchronous machine from known machine tests.
2
Be able to synchronise a synchronous machine to a grid network.
3
Derive the equivalent circuit of an induction machine from known machine tests.
4
Analyse behaviour of induction machine under load conditions.
5
Understand the implementation of passive and static power factor correction.
6
Describe the main semiconductor devices used in power electronics, compare and contrast their
main electrical properties and give examples of their respective application areas.
7
To explain the operation of rectifiers (single phase controlled and three phase uncontrolled), to
analyse the circuits and specify the main circuit parameters
8
To explain the operation of basic inverter circuits (Square wave, Sine PWM ), to analyse the circuits
and to specify the main circuit parameters
9
Describe the use of inverters in variable speed induction motor drives. To explain the torque speed
capability of an induction motor with a variable frequency variable voltage inverter.
10
The ability to undertake laboratory experiments on the material of the course, to record and
analyse the results of these experiments and to present the outcomes in technical reports.
Indicative Syllabus:
Indicative syllabus covered in the module and / or in its discrete elements
Electrical Machines:

Synchronous Machines

Construction and description of operation, salient-pole and cylindrical-rotor types. Derivation of
equivalent circuit from open-circuit and short circuit tests, synchronous reactance, the phasor diagrams
of cylindrical-rotor and salient pole machines and the Power Angle Curve. Synchronising to an infinite
busbar. Steady state stability limit.

Three-Phase Induction Machines

Production of rotating field, and description and operation of machine. Construction. Derivation of
equivalent circuit, determination of torque speed characteristic. Locked-rotor and no-load tests.
Induction generator. Introduction to V/F control. Starting methods and protection.

Power Factor Correction

Need for power factor correction. Single-phase and three-phase power factor correction. Utility and
consumer power factor correction. Active power factor correction and filters.
Power Electronics:



Switch Mode power conversion – basic concepts: The role of inductors, capacitors and transformers,
The ideal switch, Ripple and Switching Frequency, Conduction losses, Switching losses
Semiconductor switches: Diodes, Thyristors, GTOs, IGBTs. Properties, Circuit symbols, comparative
characteristics and application areas
Three phase full wave uncontrolled rectifier with inductive load: Circuit diagram, Waveforms, Output
1
M1: Module Descriptor Template
Module Code
Pre-requisite
Module codes
Co-Requisite
Modules
code(s)
ISCED
Code
Subject
Code
ECTS
Credits
NFQ Level
(CPD)#
POWS3601
5
Electrical Machines and Power Electronics
This Header should be repeated on each page of the Module
Voltage, Input Current, Input harmonics

Single phase full wave thyristor controlled rectifier: Circuit diagram, waveforms and calculations.

Introduction to inverters – main concepts, Square wave inverters

Sine PWM inverters: Circuit diagram, Circuit waveforms, Amplitude modulation index, Frequency
modulation index,

Variable Speed Drive: Fixed frequency induction motor torque speed characteristic, V/F operation,
Torque Speed capability with v/f drive, Typical V/F drive circuit diagram
Module Title
Typical Laboratory Assignments:








Three phase Rectifier (Uncontrolled)
Single Phase Line commutated Thyristor Bridge
Induction machine – development of equivalent circuit
Torque/speed characteristics of an induction machine
Synchronous machine characteristics-equivalent circuit of a synchronous machine
Synchronising a synchronous machine to an infinite bus
Sine PWM Inverter in Spice
AC Drive Simulator
Learning and Teaching Methods:
lecture, video, hands on laboratory experiments, using simulation software, report writing; group discussion,
tutorial problem solving, self-directed learning
48
52
Total Teaching Contact Hours
Total Self-Directed Learning Hours
Module Delivery Duration:
2 hr/ week lecture and 2 hr/week laboratory for 13 week semester; the module is generally delivered in 5th
semester of Dt021 programme
Assessment
Assessment Type
Weighting (%)
60%
End of semester exam
40%
LO Assessment
(No.)
1, 3, 4, 5,
6,7,8,9
1,2,3,7,10
Laboratory exercises and assignments
Module Specific Assessment Arrangements (if applicable)
(a) Derogations from General Assessment Regulations
(b) Module Assessment Thresholds
(c) Special Repeat Assessment Arrangements
As per DT021 guidelines
Essential Reading: (author, date, title, publisher)
M.H. Rashid, Power Electronics Circuits Devices and Applications, Pearson, 2013 4th international ed
P.C. Sen, Principles of Electric Machines and Power Electronics, John Wiley and Sons, 2013
Supplemental Reading: (author, date, title, publisher)
Mohan, Undeland and Robbins, Power electronics, Wiley, 2003
Mohamed E El-Hawary , Principles of Electric Machines with Power Electronic Applications, 2nd Edition,IEEE
Web links
LTSpice User Group: http://groups.yahoo.com/group/LTspice/
Matlab and simulink www.mathworks.com/
Version No:
Commencement Date
Amended By
Malabika Basu
Associated Programme DT021
Codes
# Modules that are to be offered as Stand-Alone CPD Programmes must have an NFQ level assigned
*Details of the assessment schedule should be contained in the student handbook for the programme stage.
1(dated 5/3/2015)
September 2015
2
M1: Module Descriptor Template
Module Code
Pre-requisite
Module codes
Co-Requisite
Modules
code(s)
ISCED
Code
POWS3601
Subject
Code
ECTS
Credits
NFQ Level
(CPD)#
5
Electrical Machines and Power Electronics
This Header should be repeated on each page of the Module
Module Title
Date of Academic Council approval ………………………….
3