Electric Machines

Code:

EEC0073

Acronym:

MELE

Keywords
Classification	Keyword
OFICIAL	Power

Instance: 2018/2019 - 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	108	Syllabus	3	-	6	56	162
			4

Teaching language

Portuguese

Objectives

The curricular unit aims to give the student knowledge about electrical machines, with special emphasis on electric transformers and induction motors.
The emphasis will be placed on constructive characterisation, 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

Pre-requirements (prior knowledge) and co-requirements (common knowledge)

N/A.

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, operating characterisitics, modeling and test of power transformers. Fundamentals regarding other transformers types autrotransformers and measuring 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, modeling and test of induction motors; specific aspects on single-phase inductions motors.
Command and control strategies and technological solutions for the startup, braking and speed variation of induction motors.

 

Mandatory literature

Carlos A. Sá; Artur F. Costa; Documentação MELE (2018/19 - 1º Semestre), Carlos A. Sá, 2018 (Includes textbooks, numerical applications and laboratory guides.)

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
Fraile Mora, Jesús; Máquinas eléctricas. ISBN: 84-481-3913-5

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	50,00
Teste	25,00
Trabalho laboratorial	25,00
Total:	100,00

Amount of time allocated to each course unit

Designation	Time (hours)
Estudo autónomo	90,00
Frequência das aulas	52,00
Trabalho laboratorial	20,00
Total:	162,00

Eligibility for exams

Compliance with what is regulated on attendance and a minimum of 40% on Frequency Rating.

Calculation formula of final grade

1-Final exam (written, individual, duration of 2 hours) = 10/20 points. This exam includes all the programatic components.

2-Frequency rating = 10/20 points, resulting from the evaluation in: a) laboratory (50%), covering the preparation, execution and reporting of 3 laboratory works; 2 individual written intermediate tests (50%).

IMPORTANT NOTES:

a) The student must obtain at least 40% in each assessement component.

b) Missed laboratory sessions, if they are not retrieved (case-by-case authorisation) will involve the assignment of a rating of ZERO (laboratory work and corresponding reports).

c) Missed intermediated tests will involve the assignement of a rating ZERO on the corresponding test.

Examinations or Special Assignments

- 3 laboratory works and corresponding written reports.

- 2 intermediate tests.

Internship work/project

N/A.

Observations

Care:

- prof. Carlos A. Sá (CAS - building J, office 104, phone 22508-1664, cas@fe.up.pt): Wednesdays, 09h00 / 11h00.

- prof. Artur F. Costa (AFC -building J, office 107, phone 22508-11872, acosta@fe.up.pt): Mondays, 16h00 / 18h00 and Thursdays 15h00 / 17h00.