Selection and Maintenance of Electric Motors

Academic year
Subject Area
Language of Instruction
Other Languages of Instruction
Mode of Delivery
ECTS Credits
2nd Cycle Studies - Mestrado

Recommended Prerequisites

Synchronous and asynchronous motors

Teaching Methods

Lectures with presentation of concepts, principles and fundamental theories on the taught matter. Besides the theoretical aspects, these classes include solving of practical exercises that illustrate the application of the covered concepts to real situations, requiring the combination of different theoretical concepts and also promoting the critical spirit when facing complex problems. Individual research and simulation works are also performed, in order to consolidate the matters addressed in the course, as well as to reinforce the perception of their applicability/importance.

Learning Outcomes

After completing the course, the student should be able to evaluate the efficiency and reliability of industrial electric motor driven systems, to know and to understand the operating principles of the main electric motors, to know the most relevant international standards in the scope of electric motors and drives and to identify the main technical and economic advantages/disadvantages of the different technological options available in the market. The student has to be able to properly select an electric motor/drive, including the starting and protection system. The student should also know the main maintenance strategies used in industry and the procedures underlying the corrective maintenance of three-phase induction motors, including the redesign of three-phase stator windings.  

Work Placement(s)



Efficiency and reliability of electric motor driven systems. International standards related to electric motors and drives. Constructive aspects and operating principle of commercially available electric motors. Main technological trends. Power quality and operation conditions impact on the electric motor lifetime. Electric motor selection principles. In-field load estimation of three-phase induction motors. Electric motor maintenance strategies. "Industry 4.0" concept appplied to industrial electric motor systems. Special windings for three-phase induction motors. Starting methods for three-phase induction motors. Protection system for three-phase induction motors. 

Head Lecturer(s)

Fernando José Teixeira Estêvão Ferreira

Assessment Methods

Research work: 30.0%
Exam: 70.0%


D. P. Kothari, I. J. Nagrath, "Electric Machines", 4th Ed., McGraw Hill Education, 2016.

S. Chapman, "Electric Machinery Fundamentals", 5th Ed., McGraw-Hill, 2011.

A. Fitzgerald, C. Kingsley, S. Umans, "Electric Machinery", 6th Ed., McGraw-Hill, 2006.

P. Krause, O. Wasynczuk, S. Pekarek, "Electromechanical Motion Devices", 2nd Ed., Wiley, 2012.

I. Boldea, S. A. Nasar, "Electric Drives", 3rd Ed., CRC Press, 2016.

Artigos técnico-científicos, catálogos/brochuras de fabricantes e slides disponibilizados pelo docente responsável.