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Presentation
Presentation
This unit is oriented to the study, analysis and dimensioning of the main electromagnetic machines present in the daily life of today's society in its most diverse environments.
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Class from course
Class from course
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Degree | Semesters | ECTS
Degree | Semesters | ECTS
Bachelor | Semestral | 5
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Year | Nature | Language
Year | Nature | Language
3 | Optional | Português
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Code
Code
ULHT46-27705
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Prerequisites and corequisites
Prerequisites and corequisites
Not applicable
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Professional Internship
Professional Internship
Não
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Syllabus
Syllabus
Introduction to Electric Machines: Reviews on electromagnetism. Introduction to magnetic circuits. Inductance concept. Magnetic properties of materials. Magnetic circuits with sinusoidal excitation. Electrical Transformer (T): Shared magnetic fields and circuits with magnetic coupling. Ideal (T). Transformation of electrical circuit elements. (T) equivalent circuit. Determination of the (T) parameters. Nominal capacity. (T) under load: Voltage regulation, efficiency. "Per unit" values. (T) for poly-phase systems. Autotransformers, Measurement (T). Direct current machine: Magnetic system. Windings, commutator, brushes. Torque and induced voltage. Reversibility. Equivalent circuit. Shunt, series and compound configurations. Binary-speed characteristic. AMR, switching and auxiliary poles. Power balance.
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Objectives
Objectives
This unit introduces some necessary analysis tools and then analyzes, studies and designs electromagnetic transformers and direct current rotary machines. The aim is to provide students with analysis capabilities and sizing tools for electrical machines (ME), developing their ability to understand the principles of operation inherent in each machine, as well as their applicability in practical problems. At the same time, it is intended that students are able to broaden their critical thinking in the analysis of results, promoting experimental evidence of concepts taught through laboratory tests and simulation work, using models developed by students..
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Teaching methodologies
Teaching methodologies
To support the teaching-learning process, slide projections, electrical engineering simulation software and demonstration video projections are used.
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References
References
Fitzgerald, A. E., Kingsley, C., & Umans, S. D., Electric machinery. 7th edition McGraw Hill (2013) Krause, P. C., Wasynczuk, O., Sudhoff, S. D., Pekarek, S., Analysis of electric machinery and drive systems. 4rd edition. Wiley-IEEE Press (2015) Chapman, S. J.. Electric machinery fundamentals. 5th edition.McGraw-Hill (2011) Sen, P. C. Principles of electric machines and power electronics. 3rd edition. Jonh Wiley & Sons. (2013) Sahdev, S. K. (2017). Electrical machines. Cambridge University Press.
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Assessment
Assessment
- Avaliação teórico-prática (60%) - realização de 2 frequências no período de aulas, cada uma com peso de 30% na avaliação final ou avaliação por exame de recurso/especial com o valor de 60%. Esta componente tem nota mínima de 6 val. em 12 val.
- Avaliação laboratorial (30%) - Avaliação da componente laboratorial através da realização de relatórios dos trabalhos práticos feitos em laboratório ou, em época de recurso/especial, através de um exame de laboratório. Esta componente tem nota mínima de 3 val. em 6 val.
- Os trabalhos laboratoriais serão os seguintes:
- 1. Ensaios económicos de um transformador monofásico
- 2. Transformador monofásico em carga e ligações de um transformador trifásico
- 3. Máquina de Corrente Contínua como gerador
- 4. Máquina de Corrente Contínua como motor
- A assiduidade e participação nas aulas será contabilizada com uma componente de 10% da nota final.
- A realização de exame segue o regulamento geral de avaliação, sendo as inscrições obrigatórias.
- Nota: Poderá ser realizada uma prova oral, a pedido do docente, para confirmar qualquer nota obtida na avaliação.
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Mobility
Mobility
No
