Electric Machines

Code:

EEC0073

Acronym:

MELE

Keywords
Classification	Keyword
OFICIAL	Power

Instance: 2014/2015 - 1S

Active?	Yes
Responsible unit:	Department of Electrical and Computer Engineering
Course/CS Responsible:	Master in Electrical and Computers Engineering

Cycles of Study/Courses

Acronym	No. of Students	Study Plan	Curricular Years	Credits UCN	Credits ECTS	Contact hours	Total Time
MIEEC	113	Syllabus	4	-	6	56	162

Teaching language

Portuguese

Objectives

The curricular unit aims to give the student knowledge about electrical machines, with special emphasis for transformers and electric motors. The emphasis will be placed on constructive characterization, classification, working principle, modeling and operating characteristics in stationary regime, laboratory tests and general rules for the selection, installation, use and maintenance, while stand-alone systems and as part of more complex systems.

Learning outcomes and competences

The approval in this course assumes that the student:

1. Acquire technical knowledge about classification, constitution and phenomena involved in the operation of electric machines in general and of the transformers and electric motors in particular, including the general rules for your selection, installation, use and maintenance, and that show be able to use such knowledge in the formulation, discussion and resolution of problems relating to same and its insertion in Electrical Energy Systems (skills CDIO 1.2 and 2.1). These skills will be reached through the contact periods (theoretical sessions dedicated to the explanation of the central themes of the curriculum contents and their discussion, and theoretical and practical sessions designed for the analysis and resolution of various problems of theoretical-practical nature). Your measurement will be made through the evaluation evidence provided for within the framework of the curriculum unit.

2. Acquire skills in the practice of electric machines and test experimental research on operating characteristics of transformers and electric motors, through the laboratory activity provided for in the curricular unit (fitness CDIO 2.2). Their scouting will be held through monitoring of students during the laboratory work and by assessment of written reports prepared by students.

3. Develop skills and professional attitudes, both in terms of personal responsibility (independent study and preparation work for the in-person sessions), both in terms of collective responsibility (as part of its participation in working groups, theoretical and practical sessions and lab). In this context, the student will be asked to take an active attitude to teachers and other students, in the research of basic information, in planning, preparation and implementation of diverse work (laboratory testing or troubleshooting of theoretical and practical, in particular), as well as an appropriate conduct in the laboratory, respecting safety regulations, equipment rules and test procedures (fitness CDIO 2.5). The measurement of these competencies will be through monitoring of the student during the face-to-face sessions and through evaluation.

4. Demonstrate communication skills, be it orally, in response to questions that may be asked during the face-to-face sessions, either through writing, through written reports that are required and the various evaluation tests (fitness CDIO 3.2).

Working method

Presencial

Program

The program of the course includes the following subjects:

Chapter 1 – FUNDAMENTALS OF ELECTRIC MACHINES: fundamental aspects on the classification, constitution and phenomena involved in the operation of electric machines, including the general rules for your selection, installation, use and maintenance.

Chapter 2-ELECTRIC TRANSFORMERS: construction (specific aspects); theory and operating characteristics; modelling and testing of single-phase electric transformers; general concepts on other transformers.

Chapter 3-INTRODUCTION TO ROTATING ELECTRIC MACHINES: construction (specific aspects); fundamentals of instalation and exploitation of rotating electric machines, particularly of electric motors.

Chapter 4-INDUCTION MOTORS: theory, operating characteristics and modeling of induction motors, particularly of three-phase motors.

Chapter 5-SYNCHRONOUS MOTORS: theory, operating characteristics and modeling of synchronous motors, particularly of three-phase permanent magnet Motors.

Chapter 6-SPECIAL SCHEMES of AC ELECTRIC MOTORS, command and control strategies and technological solutions for the startup, braking and speed variation of AC motors.

Chapter 7-TECHNICAL NOTES ABOUT SPECIAL ELECTRIC MOTORS: theoretical and/or operation specificities of other electric motors (conventional and brushless motors; step motors; linear motors).

Mandatory literature

Carlos A. Sá, Artur F. Costa ; Documentação MELE(A) - 2014/2015, Autores
Fraile Mora, Jesús; Máquinas eléctricas. ISBN: 84-481-3913-5

Complementary Bibliography

Carvalho, Carlos Castro; Transformadores
Ras Oliva, Enrique; Transformadores. ISBN: 84-267-0690-8
Sen, P. C.; Principles of Electric Machines and Power Electronics. ISBN: 0-471-61717-2
Chapman, Stephen J.; Electric machinery fundamentals. ISBN: 007-115155-9
McPherson, George; An introduction to electrical machines and transformers. ISBN: 0-471-05586-7
Austin Hughes; Electric motors and drives. ISBN: 0-7506-4718-3
Guilherme de Almeida ; pref. Jorge Valadares; Sistema Internacional de Unidades (SI). ISBN: 972-707-162-7

Teaching methods and learning activities

-Face-to-face Sessions:

a) Tutorial Sessions - presentation of matter of the discipline, by the teacher.

b) Laboratory Sessions: development of experimental work in the laboratory, by groups of students (max. 3 students/group), accompanied by teachers and the technician of the electric machines laboratory.

c) Practical Sessions, numerical resolution of pratical exercises by students, with the support of the professors syllabus.

- On-site work: in addition to the regular study which should be developed by the student during the academic period, will be required the reporting of some of the experimental activities provided for in the curricular unit, which will trial pieces of knowledge. In this work, students will have the availability of the professors syllabus, in the respective periods of care established.

keywords

Technological sciences

Evaluation Type

Distributed evaluation with final exam

Assessment Components

Designation	Weight (%)
Exame	70,00
Trabalho laboratorial	30,00
Total:	100,00

Amount of time allocated to each course unit

Designation	Time (hours)
Estudo autónomo	80,00
Frequência das aulas	60,00
Trabalho laboratorial	20,00
Total:	160,00

Calculation formula of final grade

1-final exam (written, individual, duration of 2.5 hours) = 14/20 points. This proof includes a theoretical omponent (10/20) and s numerical component(4/20).

2-frequency Rating = 6/20 values. Resulting from evaluation in laboratory component of the curriculum unit: a)-covering the preparation and execution of 5 laboratory works (3/20) and b)-2 dedicated reports (3/20).

IMPORTANT NOTES: a) the students can replace the Final Eam for 2 individual tests, the first about the chapters 1 to 3 and the second about the chapters 4 to 7, the latter occurring on the date that will be stipulated as Normal examination. Both tests have equal weights (35%) and a maximum duration of 2 hours. b) regardless of the student's option for the achievement of 2 written tests or final exam, there will always be classification feature in them obtained by access to a resource exam (individual and global), to be held on the date stipulated as resource examination. c) shortages given laboratory sessions, if they are not retrieved by authorised on a case-by-case substitution will involve the assignment of a rating of ZERO (laboratory work and corresponding report).