ELECTRICAL MACHINES

SHE Level 3
SCQF Credit Points 20.00
ECTS Credit Points 10.00
Module Code M3H624852
Module Leader Fhazhil Wamalwa
School School of Computing, Engineering and Built Environment
Subject Electrical Power Engineering
Trimesters
  • A (September start)
  • B (January start)
  • C (May start)

Pre-Requisite Knowledge

Electrical Systems (M2H624225) Comprising: Preliminary knowledge of magnetics, transformers, three phase systems.

Summary of Content

The module examines electromagnetic and electromechanical systems (electrical machine systems). The properties of magnetic circuits will be introduced. Electromagnetic and electromechanical analysis techniques will be developed. An understanding of the construction and components used in electrical machines will be developed. Students will use the analytical techniques developed in the detailed study of static and rotating electrical machines. Manual and computer-aided techniques will be employed to examine the performance of the electromechanical circuits/machines.

Syllabus

The taught syllabus will cover the following areas: Magnetic circuits: including flux linkage, inductance and energy; properties of magnetic materials and losses. Introduction to magnetically coupled circuits: transformers; windings; reactance and equivalent circuits; open and short-circuit tests; three phase transformers; Per unit system; Instrument transformers. Electro-mechanical energy conversion. . Use of computer simulation tools to analyse elementary circuits. Introduction to Rotating machines; Rotating magnetic field; MMF / flux distribution for AC machines Synchronous machines: Construction; Equivalent circuits; Parameter identification; Torque and power development; Power factor control; Steady-state (phasor) models; Introduction to d-q theory; Examples of applications of synchronous machines. Induction Machines: Construction; Rotating magnetic field and induced voltages; Equivalent circuits; Torque and Power development; Parameter tests; Consideration of rotor resistance. Speed-torque control of induction motors; Industrial applications and considerations of sizing of industrial motors, soft start and protection. DC machines: Construction; Windings; Development of voltage and torque; Types of DC generators; Losses; Types of DC motors and characteristics; Control of DC machines; Typical industrial applications.

Learning Outcomes

On successful completion of this module, students should be able to:Describe the general structure and components of a range of electrical machines. Develop models and characterising equations for a range of electromagnetic and electromechanical systems. Be able to describe the basic tests for parameter identification.Apply these models and equations to analyse the performance of these systems.Use software tools to aid the analysis of the system performance.

Teaching / Learning Strategy

The module material will be introduced through lectures, and web-based resources, while practical exercises, based on and extending the lecture material, will be given to students for their practical sessions. The lecture delivery will be enhanced by a variety of genre including, where appropriate, videos, computer based models and other multimedia approaches. On line learning materials are available electronically. Additional online videos are used where this form of communication would be regarded as effective. Tutorials will be used to help explain and elaborate on both the lecture material and the practical exercises and provide opportunities for tutor led formative feedback to students. Problem solving skills will be addressed through the use of examples: video support on worked examples, a selected set of worked examples from course textbook; introduction of Matlab for computer aided problem solving and defined problems with worked solutions. Underpinning support is provided from central university support services including: online study skills facility, student counselling service, access to the Learning Development Centre, IT support using e-mail and/or on-line resources). The assessment for the module comprises a combination of assessment media: an online test early on in the module to allow feedback on comprehension and skills on early course material; two course assignments which can include directed software analyses and design coursework ; and a final written examination. Student feedback on teaching, learning and assessment will be sought at the end of the semester through a module evaluation questionnaire.

Indicative Reading

Course Material: Umans, S.D. , Fitzgerald and Kingsley's Electric Machinery , McGraw-Hill International Edition, 7 th Edition, 2013. Similar Alternative Reading Material Chapman, S.J., Electric Machinery Fundamentals , McGraw-Hill International Edition, 7 th Edition, 2012. Sen, P.C., Principles of Electric Machines and Power Electronics , John Wiley & Sons, 3 rd edition, 2013. Pre-requisite Revision Material Bird, J., Electrical Circuit Theory and Technology , Routledge, 5 th Edition 2014.

Transferrable Skills

Critical analysis, Problem solving, Attention to Detail, Computer Skills, Mathematical ability, Ability to think in 3D, Visualisation skills.

Module Structure

Activity Total Hours
Tutorials (FT) 12.00
Assessment (FT) 18.00
Lectures (FT) 24.00
Practicals (FT) 24.00
Independent Learning (FT) 122.00

Assessment Methods

Component Duration Weighting Threshold Description
Coursework 2 n/a 10.00 35% Design Performance Exercise
Exam (School) 1.00 10.00 35% Maple TA - Assessment Principle Equations/Analysis
Exam (Exams Office) 3.00 70.00 35% Final Exam
Coursework 1 n/a 10.00 35% Analysis Exercise