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Ingeniería y arquitectura
- Doble Grado en Ingeniería Civil e Ingeniería de los Recursos Mineros y Energéticos
- Doble Grado en Ingeniería en Tecnologías y Servicios de Telecomunicación / Grado en Ciencia e Ingeniería de Datos
- Doble Grado en Ingeniería Informática del Software / Grado en Matemáticas
- Doble Grado en Ingeniería Informática en Tecnologías de la Información / Grado en Ciencia e Ingeniería de Datos
- Grado en Ciencia e Ingeniería de Datos
- Grado en Ingeniería Civil
- Grado en Ingeniería de los Recursos Mineros y Energéticos
- Grado en Ingeniería de Organización Industrial
- Grado en Ingeniería de Tecnologías Industriales
- Grado en Ingeniería de Tecnologías Mineras
- Grado en Ingeniería Eléctrica
- Grado en Ingeniería Electrónica Industrial y Automática
- Grado en Ingeniería en Geomática
- Grado en Ingeniería en Tecnologías y Servicios de Telecomunicación
- Grado en Ingeniería Forestal y del Medio Natural
- Grado en Ingeniería Forestal y del Medio Natural (En extinción)
- Grado en Ingeniería Informática del Software
- Grado en Ingeniería Informática en Tecnologías de la Información
- Grado en Ingeniería Mecánica
- Grado en Ingeniería Química
- Grado en Ingeniería Química Industrial
- Grado en Marina
- Grado en Náutica y Transporte Marítimo
- Información, acceso y becas
Introducción al Diseño de Motores Eléctricos
- Prácticas de Laboratorio (21 Hours)
- Prácticas de Aula/Semina (7 Hours)
- Clases Expositivas (28 Hours)
- Tutorías Grupales (2 Hours)
This course is optional for the students of the Degree of Electrical Engineering and it is taught during the second semester of the 4th course. The subject belongs to the field of the Electrical Rotating Machines and it is aimed to the students of this branch or others who want to increase their knowledge in this field.
The program is practical and oriented towards the Industry. Its goal is to give the student the knowledge and proficiencies needed to design low power electrical motors by means of commercial software tools, usually applied in industrial environments.
A lesson about Electrical Materials, as well as constructive aspects of Electrical Machines, is also included in order to give the student the proficiency needed to assume professional tasks in the field of the design of Electric Motors.
Moreover, an introduction to Electrical Materials and constructive aspects of the Electrical Machines, presented from the point of view of its industrial application, has been also included in order to give the student the fundamental knowledge to understand the manufacturing and repairing processes of electric rotating machines.
To course this subject basic knowledge about Electrical Rotating Machines is needed. It is strongly recommended to have coursed “Máquinas Eléctricas I” or any other general course in this branch of studies. Since the topics of the course are strongly specialized no other requirement exists. In fact, the industrial orientation of this course allows the students to success even in the case they are not specialists, provided they have a basic knowledge about the principles of operation of electrical motors, especially about the induction motor.
The objectives of this course concern the following proficiencies of the degree of Electrical Engineering:
1. GENERAL PROFICIENCIES
CG4: ability to critically solve technical problems.
2. SPECIFIC PROFICIENCIES
CEL1: ability for the design of electrical machines
CEL2: acquisition of knowledge about rotating electric machines and electrical drives.
3. RESULTS OF THE LEARNING PROCESS
The results of the learning process are those indicated in the point RID1-4 of the memory of the Degree of Electrical Engineering.
RID1: Being able to show specific knowledge about constructive aspects of electric motors.
Knowing the properties of the conductors used in the manufacturing of electric motors. Being able to properly select them and calculate their dimensions as a function of the power of the machine.
Knowing the properties of the insulating materials used in the manufacturing of electric motors. Being able to properly select them according to the voltage level and power of the machine.
Knowing the properties of the magnetic materials used in the manufacturing of electric motors. Being able to properly select them according to the designed motor specifications.
Knowing and identifying the properties and features of the electromechanical structure of the rotor and stator magnetic cores of electric motors.
Knowing and designing the most common stator windings of one and two layers of electric motors.
Knowing and identifying the main differences between the different manufacturing technologies for the rotor of electric motors.
RID2: Being able of identifying the design variables of electrical motors their relationships and limits.
Knowing the criteria and limitations the design of stator and rotor magnetic cores present. Calculating the number of slots and dimensions of the yokes.
Being able to select a standard enclosure for the motor that is being designed.
Being able of designing a rotor cage for an asynchronous motor including the number of bars and bar section capable of fulfill the mechanical specifications of the machine.
RID3: Being able to establish the basic equations for the design of an electric motor.
Learning the main algebraic equations used in the preliminary design of an electric motor.
Knowing and applying simplified industrial methods for the estimation of leakage reactances of electric motors.
RID4: Being able to use commercial tools for the design of electric motors.
Learning the principles of the numerical design of electric motors by means of software commercial tools.
Being able of designing by means of the finite element method a model of an asynchronous motor in 2 dimensions.
Being able of completely design an electric motor using a numerical calculation tool (commercial software).
RID5: Being able of writing the whole documentation of the design of an electric motor
DETAILED THEORETICAL PROGRAM
Lesson I: materials used in the manufacturing of electric motors
1. Conductors
a. Physical properties of the conductors used in the manufacturing of electric motors
b. Type of conductors used in electric motors
c. Properties of the copper as an electric conductor
d. Properties of the copper alloys as electric conductors
e. Properties of the aluminium as electric conductors
2. Insulating materials
a. Physical properties of the insulating materials.
b. Properties of the different compounds used as insulating systems in electric motors
i. Mica insulating systems
ii. Glass insulating systems
iii. Textile and cellulosic insulating materials
iv. Plastic polymeric insulating materials (Kapton, Nomex, etc.)
v. Another insulating materials
3. Magnetic materials
a. Physical properties of the magnetic materials
b. Ferromagnetic materials used in the core of electric motors
i. Iron-Silicon alloys
ii. Permanent magnets
Lesson II: constructive aspects of the electric motors
1. Constructive features of the asynchronous machines
a. Properties and structure of the magnetic cores
b. Properties and structure of the stator winding
i. Form-wound and random-wound windings
ii. Introduction to the design of three-phase windings
c. Features of the rotor winding
i. Squirrel-cage rotors: manufacturing processes
ii. Wound rotors
Lesson III: Introduction to the conventional calculation of electric motors
1. Revision of the physical and mathematical principles of operation of the electric motors
a. Ampere, Maxwell and Faraday’s Laws
b. Magnetic flux density
c. Leakage flux, reactance and reluctance
2. Introduction to the design of asynchronous motors
a. Fundamental equations for the calculation of an electric motor
b. Dimensions of the magnetic cores
c. Selection of the enclosure: standard enclosures.
d. Torque of an electric motor
e. Practical design of the rotor
f. Practical design of the stator
g. Introduction to the analysis and calculation of leakage reactances
Lesson IV: industrial advanced techniques for the design of electric motors.
1. Introduction to numerical calculation base on the FEM of electric motors
a. Mathematical principles
i. Practical use of the FEM with a commercial software tools
b. Development of FEM models of electric motors using commercial software
d. Analysis of the influence of constructive parameters in the functional behavior of a motor by means of commercial analytical calculation tools.
i. Influence caused by the geometrical design of the rotor
ii. Influence caused by the design of the stator windings
PRACTICAL PROGRAM:
1. Introduction to the use of public domain and commercial tools for the design of electric motors by the FEM.
2. Introduction to the use of commercial software for the analytical calculation of electric motors
3. Design by means of industrial analytical calculation software of an electric motor
4. 2D design of an asynchronous motor by means of commercial software package
The methodology that will be followed in this course consists of lectures, classroom practices, assignments in the virtual campus and lab training with software packages. Optionally, and depending on the availability of local companies, visits to their facilities might be included.
Since the goal of the course is that the students reach the needed level of knowledge to perform the preliminary design of an electric motor it is oriented to autonomous activities, especially the application of the concepts presented during the lectures to a design done with commercial software. In this regard, it will be latter explained how the evaluation will consist of the development of a project.
The whole material of the subject is uploaded in the University of Oviedo virtual campus in English.
The Schedule of the classes is as follows:
PRESENTIAL ACTIVITIES | AUTONOMOUS WORK | |||||||
Temas | Presential Lecture | Clasroom Practises | Lab Practises | Group Tutorial | Tot | Individual study | Tot | |
LESSON 1 | 4 | 0 | 0 | 0 | 4 | 3 | 7 | |
LESSON 2 | 4 | 2 | 0 | 0 | 6 | 3 | 9 | |
LESSON 3 | 25 | 8 | 0 | 0 | 33 | 20 | 53 | |
LESSON 4 | 5 | 0 | 7 | 1 | 13 | 30 | 43 | |
Total | 38 | 10 | 7 | 1 | 56 | 56 | 112 |
TYPE OF ACTIVITY | Hours | % | Total | |
Presential | Lectures | 38 | 33,9% | 50% |
Clasroom Practices | 10 | 8,9% | ||
Lab Practices | 7 | 6,3% | ||
Group Tutorials | 1 | 0,89% | ||
Autonomous | Group Study | 0 | 0 | |
Individual Study | 56 | 100% | ||
Total | 112 | 100% | 50% |
JUNE ORDINARY EVALUATION
For the June ordinary evaluation the following criteria will be applied:
1. Continuous evaluation: design of some parts of the machine and participation in the workshops and activities of the virtual campus. These partial designs will be presented in class and may be done during the classroom practices with the assistance of the teacher or delivered latter trough the virtual campus in the case some doubt arise or the time of the practices were not enough. As the course in industrially oriented the entire material will be available for the students to work with it during the designs. The maximum score that will be assigned to the continuous evaluation is 1.5 points.
2. Evaluation of lab practices: the correct development of the exercises proposed to be done with the analysis software will have a maximum score of 1.5 point. All the software applications will be available in a laboratory of the department.
3. Evaluation of the design (mixed analytical/computational) of an electric motor: this assignment will be done individually if the number of students is low. In the case the number of students does not allow to create a proposal with a different design per person groups of a maximum of three students will be formed. The design of the motor will be delivered during the official period of evaluation of the University of Oviedo. Any student/group can decide the date of delivery provided it is inside this period. The assignment will consist of the complete design of an asynchronous motor that may optionally be validated by means of any of the software packages. The use of software will be scored with 2 points. If only the analytical calculation is presented the maximum score will be 5 points. To obtain the absolute maximum score both a document with the mathematical calculation and the files of the program with the validation of the results must be presented.
The estimation of the workload of the assignment is around 25 hours including both the computational and mathematical design. The maximum score for this assignment is of 7 points. A minimum of 2 points must be obtained to pass the course.
JULY EXTRAORDINARY EVALUATION
For the extraordinary evaluation two possibilities exist:
A. Student has done the continuous evaluation and the lab practices and has obtained in both cases at least a 50% of the maximum score. In this case the student can keep the points obtained and the evaluation will only consist of a written exam of around 2 hours where a simple mathematical design will be proposed. A total score of 5 points must be obtained to pass the subject provided the minimum score in the written exam is 2.
B. Student has not done either the continuous evaluation or the lab practices or has not reached the 50% of the maximum score in any of them. In this case the points previously obtained cannot be kept. To pass the subject the above written examination will be done as well as the software validation of the design. The written examination will be held the day assigned by the EPIG and the software design (which is considered a re-evaluation of the lab practices) will be delivered no later than 1 additional week after the end of the examination period. To pass the subject a minimum of 5 points must be obtained. Both parts will be evaluated up to 5 points and the minimum score must be 2.
The available resources will be the following:
1. The whole material will be uploaded in the virtual campus. It will include Powerpoint presentations, exercises, and all kind of complementary materials.
2. Software packages installed in a computer room of the department for the use of the students.
3. Several copies of the following book: Essam Hamdi, "Design of small electrical machines". John Wiley&Sons, ISBN 0-471-95202-8. Only this book is recommended since all the mathematical calculation process is included on it. Moreover, this is a really modern book with a simple but accurate pratical approach.