
Course unit
ELECTRICAL SCIENCE AND ELECTRIC MACHINES
INL1000247, A.A. 2019/20
Information concerning the students who enrolled in A.Y. 2018/19
ECTS: details
Type 
ScientificDisciplinary Sector 
Credits allocated 
Educational activities in elective or integrative disciplines 
INGIND/31 
Electrotechnics 
6.0 
Core courses 
INGIND/32 
Electrical Convertors, Machines and Switches 
3.0 
Course unit organization
Period 
First semester 
Year 
2nd Year 
Teaching method 
frontal 
Type of hours 
Credits 
Teaching hours 
Hours of Individual study 
Shifts 
Lecture 
9.0 
72 
153.0 
No turn 
Prerequisites:

Basic knowledge from mathematics and physics courses, in particular: laws of electromagnetism, differential and integral calculus, complex numbers, vector operators (div, grad, rot). 
Target skills and knowledge:

Students will develop the following knowledge and skills during this course:
First Part: Electrical science
1 knowledge of the fundamental properties and methodologies for circuit analysis, and ability to model electric devices through simplified circuits and models;
2 knowledge of the laws of magnetic induction, and their application to magnetic circuits;
3 knowledge of the basic principles of generation, distribution, and conversion of the electric energy;
4 knowledge of protection systems and safety in electric installations;
5 ability to analyse electric circuits through basic methods and techniques, and their applicability limits;
6 ability to calculate voltages, currents and absorbed power on electric components of a circuit;
Second part: Electric machines
7 Knowledge of the operating principles of electric motors ;
8 knowledge of specific terminology, and understanding the parameters describing electromechanical systems;
9 ability to read and understand commercial catalogues and select the proper electromechanical device for given applications. 
Examination methods:

The final test is divided in written examination and oral part:
 During the written examination, the student is required to solve two applied problems (2 h), and answer to two openended questions (1h).
 During the oral test, the student is required to answer two open questions (at the blackboard).
The student will take the oral examination only if he gets a positive mark in the written part. The final mark is decided based on of both written and oral tests. 
Assessment criteria:

1 analytical ability and correctness in the approach to applied problems;
2 exactness of numerical results in applied exercises;
3 completeness of theoretical knowledge related to electric science and electromechanical systems;
4 technical and theoretical rigor in the description of electrical applications;
5 terminological correction and distinction in the description of electrical applications;
6 completeness of the theoretical background concerning mechanical torque produced by electric motors;
7 ability to discuss fundamental equations of electric machines and their modelling with lumped models
8 presentation skills, rigor and clarity 
Course unit contents:

Part 1: Circuit Theory and Electromagnetic Fields (INGIND/31, 6 CFU)
Fundamentals of electric circuits, 2terminal, multiterminal elements, nodes, loops. Electric current, electric voltage and electric potential, amperemeter, voltmeter. Kirchhoff's laws, electric power, measuring conventions and energy balance. Linear and nonlinear components: resistors, diodes, voltage and current sources; series and parallel connection, voltage divider and current divider.
DC steadystate circuit: properties of 2terminal linear circuits, methods for linear circuit analysis: superposition of effects, Thevenin and Norton equivalent circuits. Maximum power transfer and Load matching in DC systems.
Application of electromagnetic field laws to electric circuits: Gauss, Ampere and FaradayHenryNeumann laws form the circuit point of view.
Magnetic properties of materials, magnetic permeability, ferromagnetic materials, hysteresis, magnetic circuits, stored energy, pressure and forces on magnetic materials. Energy storage elements: capacitors, inductors, coupled inductors, magnetic circuits, forces and energy.
AC steadystate circuits: Steinmetz's symbolic method, impedance, admittance. Instantaneous power, active, reactive, complex and apparent power, power balance, frequencydomain analysis of RLC circuits, resonance. AC circuit measurements. Maximum power transfer and impedance matching in AC systems.
Fundamentals of electrical machines: Power Transformers: equivalent circuit, operating conditions, applications. Eddy currents and induction heating for material processing.
Fundamentals of electric energy transmission and distribution systems: 3phase systems, / Y connections and transformation, reactive power compensation, rotating magnetic field.
Fault protection and safety codes for power distribution systems. Direct and indirect contacts, TT grounding scheme for personnel protection.
Solidstate power converters, noncontrollable and controllable semiconductor devices, basic schemes for AC/DC and DC/AC power conversion.
Part 2: Electrical machines (INGIND/32, 3 CFU)
Definition of electric machine. Functional block diagrams. Aspects of cost, efficiency, performance. Topologies of reluctance, electrodynamic, induction systems.
Principle of operation of the DC motor. Motor construction aspects. Analysis of technical catalogs.
Permanent magnet synchronous motor drives and DC brushless motors. Selection criteria and fieldoriented control. Example of selection of synchronous motor from the catalog, according to the project specifications. Examples of motor constructions.
Asynchronous motors, operating principle. Voltage and torque equations at steady state. Scalar control, Volt / Hertz technique. Analysis of technical catalogs.
Stepper motors (VR, PM and hybrid). Principle of work, motor topologies available on the market and analysis. 
Planned learning activities and teaching methods:

Lecturestyle instruction (blackboard or powerpoint slides) will cover the whole course program. Lessons dedicated to applied problems and exercises (electrical circuits) will also be given.
Three teachers (E.Sartori, G. Chitarin, F. Tinazzi) cover the different competencies of the course. 
Additional notes about suggested reading:

All didactic material will be available on the moodle platform 
Textbooks (and optional supplementary readings) 

G. Chitarin, F. Gnesotto, M. Guarnieri, A. Maschio, A. Stella, Elettrotecnica 1  Principi. Bologna: Esculapio, 2017.

G. Chitarin, F. Gnesotto, M. Guarnieri, A. Maschio, A. Stella, Elettrotecnica 2  Applicazioni. Bologna: Esculapio, 2018.

A. Hughes e B. Drury, Electric motors and drives: fundamentals, types and applications  4th edition. Amsterdam: Elsevier, 2013.

Innovative teaching methods: Teaching and learning strategies
 Lecturing
 Auto correcting quizzes or tests for periodic feedback or exams
 Loading of files and pages (web pages, Moodle, ...)
Innovative teaching methods: Software or applications used
 Moodle (files, quizzes, workshops, ...)
Sustainable Development Goals (SDGs)

