Electric Machines

Code:

EEC0073

Acronym:

MELE

Keywords
Classification	Keyword
OFICIAL	Power

Instance: 2012/2013 - 2S

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	125	Syllabus (Transition) since 2010/2011	3	-	6	63	162
		Syllabus	3	-	6	63	162

Teaching language

Suitable for English-speaking students

Objectives

This course unit aims to endow students with fundamental knowledge in electric machines, especially in electric transformers and induction motors.  Crosscutting aspects are discussed and key references are made about other machines.

Special emphasis will be given to the classification, characteristics of construction, functioning principles, modelling and functioning characteristics in stationary state, testing and general rules of selection, installation, use and maintenance of electric systems as autonomous systems and as an element of a more complex system.

Learning outcomes and competences

To complete this course unit, students have to:

1. acquire technical knowledge in the classification, composition and phenomena which are part of the functioning of electric machines. Electric transformers and induction motors: general rules of selection, installation, use and maintenance. Students should be capable of applying their knowledge in the formulation, resolution and discussion of problems related to the above mentioned themes and its insertion in electrical energy systems (CDIO Syllabus 1.2 and 2.1). Students will have the chance to get familiar with these themes in classes (theoretical sessions dedicated to the presentation and discussion of the main themes of the course unit; theoretical-practical sessions dedicated to the analysis and resolution of theoretical-practical problems). It will take place tests to assess these skills.

2. acquire knowledge in electric machine testing and experimental research about the functioning of transforms and induction motors, by doing laboratory assignments (CDIO Syllabus 2.2). These skills will be assessed by supervising students’ laboratory assignments and by the evaluation of the respective reports.

3. develop professional skills and attitudes, both at an personal level (autonomous study and preparation of work) and group level (participation in group assignments during theoretical-practical and laboratory assignments). Students will be asked to have an active attitude towards professors and colleagues, regarding research of information, planning, preparing and carrying out an assignment (laboratory tests or resolution of theoretical-practical problems), as well as having a correct attitude in the laboratory, by respecting safety standards, and rules of using equipment and testing procedures (CDIO Syllabus 2.5). These skills will be assessed by supervising students during classes and tests.

4. show communication skills, both oral (answering to questions during classes) and written (reports) (CDIO Syllabus 3.2).

Working method

Presencial

Program

The program of the course includes the following matters:

Chapter 1 - FUNDAMENTALS OF ELECTRICAL MACHINERY
Fundamental aspects of the classification, construction and phenomena involved in the operation of electric machines, including general rules for their selection, installation, use and maintenance.

Chapter 2- ELECTRIC TRANSFORMERS Specific aspects of their constrution, theory and  operating characteristics, modelling and testing of single phase electric transformers; general concepts about other transformers: three phase power transformers, transformers of number of phases, autotransformers, measurement and protection transformers.

Chapter 3 - INTRODUCTION TO ELECTRICAL ROTATING MACHINERY
Fundamental aspects related to the construction and operation of rotating electrical machines, production and exploitation of electromagnetic phenomena, general working principles. Fundamental concepts about energy efficiency of electromechanical systems.

Chapter 4 - MOTOR INDUCTION
Specific constructive aspects, theory and operating characteristics, modeling of single and three phase induction motors, starting, reversing the direction of rotation, braking and strategies for change and speed control of electrical drives based on that type of engine.

Mandatory literature

Jesús Fraile Mora; Máquinas eléctricas. ISBN: 84-481-3913-5 (Text base for supporting the study.)
Austin Hughes; Electric motors and drives. ISBN: 0-7506-4718-3 (As an alternative to the main text in the part relating to Rotating Machines)
Artur Fernandes Costa; Documentação MEle 2013, 2013 (Includes theoretical notes, texts of lectures, problem statements for classes and other resolved and unresolved and scripts for laboratory work.)

Complementary Bibliography

Enrique Ras Oliva; Transformadores. ISBN: 84-267-0690-8 (As an alternative to the main text in the part relating to Transformers)
Stephen J. Chapman; Electric machinery fundamentals. ISBN: 007-115155-9 (As an alternative to the main text.)
Austin Hughes; Electric motors and drives. ISBN: 0-7506-4718-3 (As an alternative to the main text in the part relating to Rotating Machines)
George McPherson; An introduction to electrical machines and transformers. ISBN: 0-471-05586-7 (As an alternative to the main text.)
P. C. Sen; Principles of electric machines and power electronics. ISBN: 0-471-61717-2 (As an alternative to the main text.)
Carlos Castro Carvalho; Transformadores (As an alternative to the main text in the part relating to Transformers)

Teaching methods and learning activities

Classes: Theoretical classes: presentation of the themes of the course unit by the professor Theoretical-practical classes: resolution of theoretical-practical exercise by the professor and students Laboratory classes: development of an experimental assignment by groups of students (maximum of 3 students in each group) supervised by the professor and the laboratory technician. Outside of class: Besides regular study, students will be asked to write reports about their laboratory assignments, which will be taken into account in the final grade. Students can schedule a meeting with the professors during office hours.

keywords

Technological sciences > Engineering > Electrical engineering

Evaluation Type

Distributed evaluation with final exam

Assessment Components

Description	Type	Time (hours)	Weight (%)	End date
Assessment test	Exame	6,00	80,00	2013-07-31
Experimental work in laboratory and reports	Trabalho laboratorial	18,00	20,00	2013-07-31
	Total:	-	100,00

Amount of time allocated to each course unit

Description	Type	Time (hours)	End date
Attendance (estimated)	Frequência das aulas	60	2013-07-31
Working without attending (estimated)	Estudo autónomo	80	2013-07-31
	Total:	140,00

Eligibility for exams

Students cannot miss more classes than allowed by the rules (3 theoretical-practical/laboratory classes). Students have to reach a minimum grade of 50% in the continuous assessment component.

Calculation formula of final grade

1- Final Exam (written; individual; 2,5 hours) = 80%

Students can opt to substitute this exam by two individual written tests. The first will cover chapter 1 and 2. The second will cover chapter 3 and 4 and it will take place during the normal season of exams. Each of these tests is worth 40% of the final grade and they will last 2 hours.

2- Continuous Assessment = 20%

Assessment of the laboratory assignments (preparation, carrying out the 3 assignments and report).

COMMENTS:

a) If students do not attend laboratory classes, and if they are not replaced, students will earn a ZERO in the assignment.

b) Students will have a chance to repeat their exams at Second Season season by attending a new exam. This exam will cover all the themes of this course unit.

c) Continuous assessment obtained in the previous school year will be valid in the current school year if the student does not declare otherwise.

Examinations or Special Assignments

- 3 laboratory assignments by groups of students and supervised by the professor (laboratory of electrical machinery)

- 2 individual written tests instead of final exam (Regular Season), for students who choose well.

Special assessment (TE, DA, ...)

Students with a special status who did not attend this course in the previous year will be assessed in the following way:

Final Exam: 80%

Laboratory Exam (Oral): 20%

COMMENTS:

a) Laboratory exam is only mandatory for students which have a special status and did not do laboratory assignments. Laboratory exam will substitute the continuous assessment component.

b) These students can also opt to attend two tests instead of the final exam.

Classification improvement

Students can improve their grades by attending a new exam. However, they can only improve the grade of the exam (80%), since the continuous assessment grade will remain the same. This exam will cover all the themes of this course unit.

Observations

Attendance of teachers to students:

Artur Fernandes Costa (Office. J107 - tel. 22508-1872 - acosta@fe.up.pt): Wednesday from 2.30 pm to 6.30 pm

Carlos Araújo Sá (Office. J104 - tel. 22508-1664 - cas@fe.up.pt): Monday from 2.30 pm to 6.30 pm