### Technology

## Subject: ELECTRICAL DRIVES (A.A. 2023/2024)

### master degree course in AUTOMOTIVE ENGINEERING

Course year | 1 |
---|---|

CFU | 6 |

Teaching units |
Unit Azionamenti Elettrici
Related or Additional Studies (lesson)
- TAF: Supplementary compulsory subjects SSD: ING-IND/32 CFU: 6
Stefano NUZZO, Davide BARATER |

Exam type | written |

Evaluation | final vote |

Teaching language | Italiano |

### Teachers

### Overview

The course is intended to give knowledge on the principle of operation of electric drives based on AC machines.

In particular, the course aims to present the main challenges related to the use of electric drives in industrial and automotive applications.

the module aims to provide the basic knowledge relative to preliminary sizing of electrical machines.

For a more complete understanding of the training objectives, please refer to the reading of the learning outcomes expected following the completion of this training course.

### Admission requirements

The students are expected to be familiar with the notions of mathematics, physics and electrical circuits.

### Course contents

The subdivision of the contents for CFU is to be understood as purely indicative. It may in fact undergo changes during the course of teaching in light of the feedback from the students.

Introduction to Electric Drives and their main components. Motor-load dynamic; torque - speed characteristics; overload capability. (ECTS 0.5, 4.5 hours)

Materials and losses. Recalling of electromechanical conversion and actuators. Stator and Rotor. Rotating magnetic fields. (ECTS 2, 18 hours)

Structure and operating principle of synchronous machines: dynamic models and vector control.

Optimal control of electric motors: MTPV and MTPA trajectories. (ECTS 2.5, 22.5 hours)

Electrical machine design.

Guidelines, constraints, torque expression, windings, sizing formulas and principles. (ECTS 1, 9 hours)

Only for Mechanical Engineering the course will cover also the following topics:

Synchronous Electrical machine design with finite element SW. (ECTS 1, 9 hours)

Induction machine. Dynamic model and scalar control. (ECTS 1, 9 hours)

Development of a dynamic model of synchronous machines in matlab simulink, current feedback control, speed feedback control (ECTS 1, 9 hours)

### Teaching methods

The course includes face-to-face lectures (theory and calculations) and is delivered in Italian. The lessons are carried out with the aid of multimedia systems and can also involve practical exercises in which students utilize software for the simulation of electric drives (Matlab / Simulink and PLECS) and finite element analysis of electrical machines (Flux). In addition, professors receive students by appointment for clarification and personalized tutoring. The teaching material will be made available at the end of each lesson through the “Teams” platform. Mathematical models will be used for numerical modeling and computer simulation with Matlab / Simulink, PLECS and Flux.

### Assessment methods

The exam includes a written test consisting of exercises and open-ended questions. Unless otherwise specified, the test consists of: • first exercise to be carried out in 30 minutes, maximum score 8 points. The exercise consists of four questions, each rated 2 points in case of correct answer and 0 points in case of wrong answer • second exercise, to be carried out in 30 minutes, maximum score of 8 points. The exercise consists of four questions, each rated 2 points in case of correct answer and 0 points in case of wrong answer • first part of open-ended questions to be completed in 30 minutes, maximum score of 8 points. This part consists of two open-ended questions with a maximum score of 4 each • second part of open-ended questions to be completed in a time of 30 minutes, maximum score of 9 points. This part consists of three open-ended questions with a maximum score of 3 each The exercises are aimed at evaluating: • knowledge and understanding skills; • the application of knowledge and understanding; • autonomy of judgment. For open-ended questions, the evaluation parameters consist of: • the application of knowledge and understanding; • autonomy of judgment; • communication skills The use of notes, reference or support material is not allowed for the test. The use of the calculator for the exercises is allowed. The exam score is given by the sum of the points obtained. The final score is expressed in 33/30, a score greater than 30 leads to obtaining the grade: 30 with honours. The results will be published through Esse3.

### Learning outcomes

1) Knowledge and understanding capabilities

At the end of the module, the student should be able to:

a) Be confident and familiar with the applications where electric drives are involved, as well as be able to identify the main components;

b) describe with clarity and without hesitations the main components of an electric drive and their main features and characteristics.

2) Applied knowledge and understanding capabilities

for any type of electric drive the student must be familiar with:

a) the construction details;

b) the operating principles;

c) the main control schemes and algorithms;

d) the possible applications (industrial, traction, household appliances, etc.);

e) guidelines and sizing equations for control algorithm of AC electrical machines.

3) Judgement autonomy

a) to verify the own level of understanding of the taught concepts thanks to the possibility of intervening during the lecture;

b) to re-organize the gained knowledge and to implement the capability of a critical evaluation and autonomy.

4) Soft skills

To communicate with clarity, the gained knowledge and to be able to identify the topic to be addressed answering to the exam’s questions in a comprehensive manner.

5) Understating capabilities

a) to strengthen the learnt concepts such that to continue the academic career using a proper and suitable vocabulary, structures, configurations, schemes and concepts as tools to understand and study the electromagnetic phenomena in a comprehensive way.

### Readings

Shaahin Filizadeh. Electric Machines and Drives: Principles, control, modelling and simulation. CRC Press.

A. E. Fitzgerald , C. Jr. Kingsley , A. Kusko: MACCHINE ELETTRICHE, Franco Angeli Editore.

Ezio Bassi, Antonio Bossi, Elettrotecnica pratica. Macchine e azionamenti elettrici, Volume 3, Editoriale Delfino, 2013.

W. Bolton, "Mechatronics - electronic control systems in mechanical and electrical engineering", 4th ed., Pearson Educational, ISBN 978-0-13- 240763-2.

Juha Pyrhonen, Tapani Jokinen, Valeria Hrabovcova. “Design of Rotating Electrical Machines, 2nd Edition”, , Wiley ISBN: 978-1-118-58157-5. December 2013

Sulla pagina TEAMS relativa all’insegnamento sono disponibili (nel rispetto dei diritti d’autore)

- Le dispense utilizzate dal docente nel corso delle lezioni frontali e delle esercitazioni numeriche

- le slide delle lezioni

- I modelli matematici introdotti per la modellazione numerica e simulazione al calcolatore con Matlab/Simulink, PLECS e Flux.