| Title: | Electrical Machines |
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| Long Title: | Electrical Machines |
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| Field of Study: |
Electrical Engineering
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| Valid From: |
Semester 1 - 2014/15 ( September 2014 ) |
| Module Coordinator: |
JOSEPH CONNELL |
| Module Author: |
NOEL MULCAHY |
| Module Description: |
This module develops the underlying energy conversion theory between electrical and mechanical systems by introducing electromechanical energy conversion principles and three-phase systems, transformers, DC, induction, and synchronous machines and the power systems employing these devices. |
| Learning Outcomes |
| On successful completion of this module the learner will be able to: |
| LO1 |
appraise electrical supply equipment and be able to make selections from theoretical considerations. |
| LO2 |
analyse and describe aspects of the construction, principle of operation, applications, methods of
speed control, and methods of direction reversal of d.c. machines |
| LO3 |
analyse and describe aspects of the construction, principle of operation, applications, methods of speed control, and methods of direction reversal of a.c. machines |
| LO4 |
describe the construction, application and operation of single phase and three phase
transformers |
| Pre-requisite learning |
Module Recommendations
This is prior learning (or a practical skill) that is strongly recommended before enrolment in this module. You may enrol in this module if you have not acquired the recommended learning but you will have considerable difficulty in passing (i.e. achieving the learning outcomes of) the module. While the prior learning is expressed as named CIT module(s) it also allows for learning (in another module or modules) which is equivalent to the learning specified in the named module(s). |
| No recommendations listed |
Incompatible Modules
These are modules which have learning outcomes that are too similar to the learning outcomes of this module. You may not earn additional credit for the same learning and therefore you may not enrol in this module if you have successfully completed any modules in the incompatible list. |
| No incompatible modules listed |
Co-requisite Modules
|
| No Co-requisite modules listed |
Requirements
This is prior learning (or a practical skill) that is mandatory before enrolment in this module is allowed. You may not enrol on this module if you have not acquired the learning specified in this section. |
| No requirements listed |
Co-requisites
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| No Co Requisites listed |
Module Content & Assessment
| Indicative Content |
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Transformers
Transformer principles, ideal transformer calculations. Magnetising current, iron and copper losses, equivalent circuit. Use of per unit or per cent impedance. Regulation and efficiency. Construction of power transformer.
Three phase transformers. Use of transformer for impedance matching at high frequencies. Instrument transformers
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AC Generators
Construction and use of salient pole and cylindrical rotor types. Principle of operation, relationship between speed, number of poles and frequency. Description of voltage regulator and governor action. Use of synchronous motor to control reactive consumption.
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Three phase induction motor
Principle of operation, rotating field, produced by stator windings, resulting torque on rotor, concept of slip. Torque / slip curves. Construction of stator and squirrel cage rotor. Effect of rotor resistance and reactance on torque. Description and use of wound rotor induction motor. Power factor, efficiency, starting torque and current.
Direct-on, star-delta and rotor resistance starters. Speed control; inverters.
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Single Phase Motors
Construction and principle of operation of different types of single phase induction motors. Split phase, Capacitor start, Universal motor. Typical ratings and application of single phase motors.
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DC Machines
Commutating devices, interpoles, armature reaction. Equation for generated emf. Comparison of lap and wave windings. Equation of motor torque and speed. Characteristics of series, shunt and compound connections and applications. Use for speed control. Thyristor control. Inverter driven DC machines and braking.
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| Assessment Breakdown | % |
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| Course Work | 40.00% |
| End of Module Formal Examination | 60.00% |
| Course Work |
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| Assessment Type |
Assessment Description |
Outcome addressed |
% of total |
Assessment Date |
| Performance Evaluation |
Weekly assessment through laboratory-based experiments. |
1,2,3,4 |
30.0 |
Every Week |
| Multiple Choice Questions |
Assessment of lecture material covered in weeks 1-6. |
1,3,4 |
10.0 |
Week 7 |
| End of Module Formal Examination |
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| Assessment Type |
Assessment Description |
Outcome addressed |
% of total |
Assessment Date |
| Formal Exam |
End-of-Semester Final Examination |
1,2,3,4 |
60.0 |
End-of-Semester |
| Reassessment Requirement |
Repeat examination
Reassessment of this module will consist of a repeat examination. It is possible that there will also be a requirement to be reassessed in a coursework element.
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The institute reserves the right to alter the nature and timings of assessment
Module Workload
| Workload: Full Time |
| Workload Type |
Workload Description |
Hours |
Frequency |
Average Weekly Learner Workload |
| Lecture |
Lecture on electrical machine theory. |
3.0 |
Every Week |
3.00 |
| Lab |
Laboratory demonstration with students utilising raw data to determine characteristics of machine under test |
1.0 |
Every Week |
1.00 |
| Independent & Directed Learning (Non-contact) |
Further study of class notes and recommended resources. |
3.0 |
Every Week |
3.00 |
| Total Hours |
7.00 |
| Total Weekly Learner Workload |
7.00 |
| Total Weekly Contact Hours |
4.00 |
| This module has no Part Time workload. |
Module Resources
| Recommended Book Resources |
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- John Bird 2010, Electrical Circuit Theory and Technology, 4th Ed., Routledge [ISBN: 978-1856177702]
| | Supplementary Book Resources |
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- Austin Hughes (Author) & Bill Drury (Author) 2013, Electric Motors and Drives: Fundamentals, Types and Applications, 4th Ed., Newnes [ISBN: 978-0080983325]
- Edward Hughes, Dr John Hiley et al 2012, Electrical & Electronic Technology, 11th Ed., Pearson [ISBN: 978-0273755104]
| | This module does not have any article/paper resources |
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| This module does not have any other resources |
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Module Delivered in
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