Teachings
IN/0006  ELECTRICAL MACHINES
Academic Year 2020/2021
Free text for the University
 Professor

ALFONSO DAMIANO (Tit.)
 Period

Second Semester
 Teaching style

Convenzionale
 Lingua Insegnamento

ITALIANO
Informazioni aggiuntive
Course  Curriculum  CFU  Length(h) 

[70/84] ENERGETIC ENGINEERING  [84/00  Ord. 2018] PERCORSO COMUNE  6  60 
[70/89] ELECTRICAL, ELECTRONIC AND COMPUTER ENGINEERING  [89/10  Ord. 2016] ELETTRICA  6  60 
[70/89] ELECTRICAL, ELECTRONIC AND COMPUTER ENGINEERING  [89/46  Ord. 2016] ELETTRICA ON LINE E IN PRESENZA (BLENDED)  6  60 
Objectives
The course aims to analyze the fundamental principles of electric machines in order to develop the modelling in steady state condition.
Knowledge and understanding:
Knowledge and understanding of the theoretical and applicative aspects related to the conversion of electrical energy in mechanical one.
Ability to apply knowledge and understanding:
Ability to analyse the operative condition of electrical machines in steady state in domestic and industrial application.
Making judgments:
Ability to correctly evaluate the performance of the various types of electric machines, based on their technical characteristics
Communicative Skills:
Ability to discuss, with specialist interlocutors, the main topic related to the electric machines in steady state conditions.
Learning ability:
Continuous learning abilities, through the correct interpretation of technical documents and the scientific bibliography.
Objectives
The course aims to analyze the fundamental principles of electric machines in order to develop the modelling in steady state condition..
Knowledge and understanding:
Knowledge and understanding of the theoretical and applicative aspects related to the conversion of electrical energy in mechanical one.
Ability to apply knowledge and understanding:
Ability to analyse the operative condition of electrical machines in steady state in domestic and industrial application.
Making judgments:
Ability to correctly evaluate the performance of the various types of electric machines, based on their technical characteristics
Communicative Skills:
Ability to discuss, with specialist interlocutors, the main topic related to the electric machines in steady state conditions.
Learning ability:
Continuous learning abilities, through the correct interpretation of technical documents and the scientific bibliography
Prerequisites
Knowledge: An adequate knowledge of the fundamental methodological aspects of the basic science related to Mathematical Analysis, Physics and Electrical Engineering.
In particular, it is recommended to have passed the following exams: Mathematics 1, Mathematics 2, Physics 1, Physics 2 and Electrotechnics.
Prerequisites
Knowledge: An adequate knowledge of the fundamental methodological aspects of the basic science related to Mathematical Analysis, Physics and Electrical Engineering.
In particular, it is recommended to have passed the following exams: Mathematics 1, Mathematics 2, Physics 1, Physics 2 and Electrotechnics.
Contents
Introduction to the Electrical Machine course (1 hour of lecture): description of the course contents and description of the methodology for learning assessment.
The basic laws of electromagnetism (6 hours of frontal lesson):
Ampere Law, FaradayLenz's Law, magnetic fields, magnetic property of materials, materials
used in electromagnetic systems and their properties, refractive law of field lines, energy stored in the magnetic and electric field, magnetic pressure on the boundary surface of materials with different magnetic permeability. Analysis and comparison between electrostatic and electromagnetic machines; Thermal phenomena in electromagnetic systems.
The transformer (8 hours of lecture and 2 hours of exercise)
The ideal transformer. The transformer characterised by the use of magnetic material with linear characteristic : constructive features, the leakage and linkage fluxes,
The noload, load and short circuit working conditions. Analysis of transformer by energy point of view.
The real transformer: the ferromagnetic core, the iron losses, the magnetic characteristic;
The noload working conditions, mathematical model and equivalent circuit, energy analysis;
The load operation of transformer: the mathematical model;
Equivalent circuit; Simplified equivalent circuit;
vector diagram representing the steady state load operation. Transformer evaluation of equivalent circuit parameters by noload and short circuit tests. Losses and efficiency of the transformers; The threephase transformer: connection types and groups, the core of the threephase transformer; noload and load operation.
General Approach for modelling rotating machines (15 hours of lecture and 4 hours of exercise)
The principles of electromechanical energy conversion: electromagnetic energy conversion; Forces in rotating electric machines; Microscopic form of Ampere law; Electromechanical systems with only one excitation winding; Reluctance torque; Electromechanical systems with multiple windings; Structure of electric machines, electric windings; The magnetic field in the air gap of isotropic electric machines; Polar pairs; Electric angles and mechanical angles; The methodology for the evaluation of the linkage flux in the rotating elerctrical machines anf of the e.m.f; The evaluation of air gap inductance;
Electromagnetic torque in rotating electric machines;
Synchronous electric machine (10 hours of lecture and 4 hours of exercise)
Mechanical structure and geometry of Synchronous electric machine; Analysis and modelling of Synchronous electric machine in noload operation: noload characteristic;
Analysis and modelling of load operation; Equivalent circuit of the electric machine under load operation; Steady State working operation of the synchronous machine on power grid;
electromechanic Torque ; Mechanic stability of Synchronous electric machine under load variation; Active and reactive power diagram; Shortcircuit analysis of Synchronous electric machine;
Short circuit characteristic; Anisotropic Synchronous electric machine, theory of double reaction, mathematical model of Anisotropic Synchronous electric machine; Blondel diagram, circular diagram of the synchronous; Analysis of Synchronous electric machine under saturation condition : Potier triangle;
Asynchronous electric machine (8 hours of front lesson and 2 hours of exercise)
Mechanical structure and geometry; generality; Mathematical modelling in steady state condition
Equivalent circuit; Circular diagram.
Contents
Introduction to the Electrical Machine course (1 hour of lecture): description of the course contents and description of the methodology for learning assessment.
The basic laws of electromagnetism (6 hours of frontal lesson):
Ampere Law, FaradayLenz's Law, magnetic fields, magnetic property of materials, materials
used in electromagnetic systems and their properties, refractive law of field lines, energy stored in the magnetic and electric field, magnetic pressure on the boundary surface of materials with different magnetic permeability. Analysis and comparison between electrostatic and electromagnetic machines; Thermal phenomena in electromagnetic systems.
The transformer (8 hours of lecture and 2 hours of exercise)
The ideal transformer. The transformer characterised by the use of magnetic material with linear characteristic : constructive features, the leakage and linkage fluxes,
The noload, load and short circuit working conditions. Analysis of transformer by energy point of view.
The real transformer: the ferromagnetic core, the iron losses, the magnetic characteristic;
The noload working conditions, mathematical model and equivalent circuit, energy analysis;
The load operation of transformer: the mathematical model;
Equivalent circuit; Simplified equivalent circuit;
vector diagram representing the steady state load operation. Transformer evaluation of equivalent circuit parameters by noload and short circuit tests. Losses and efficiency of the transformers; The threephase transformer: connection types and groups, the core of the threephase transformer; noload and load operation.
General Approach for modelling rotating machines (15 hours of lecture and 4 hours of exercise)
The principles of electromechanical energy conversion: electromagnetic energy conversion; Forces in rotating electric machines; Microscopic form of Ampere law; Electromechanical systems with only one excitation winding; Reluctance torque; Electromechanical systems with multiple windings; Structure of electric machines, electric windings; The magnetic field in the air gap of isotropic electric machines; Polar pairs; Electric angles and mechanical angles; The methodology for the evaluation of the linkage flux in the rotating elerctrical machines anf of the e.m.f; The evaluation of air gap inductance;
Electromagnetic torque in rotating electric machines;
Synchronous electric machine (10 hours of lecture and 4 hours of exercise)
Mechanical structure and geometry of Synchronous electric machine; Analysis and modelling of Synchronous electric machine in noload operation: noload characteristic;
Analysis and modelling of load operation; Equivalent circuit of the electric machine under load operation; Steady State working operation of the synchronous machine on power grid;
electromechanic Torque ; Mechanic stability of Synchronous electric machine under load variation; Active and reactive power diagram; Shortcircuit analysis of Synchronous electric machine;
Short circuit characteristic; Anisotropic Synchronous electric machine, theory of double reaction, mathematical model of Anisotropic Synchronous electric machine; Blondel diagram, circular diagram of the synchronous; Analysis of Synchronous electric machine under saturation condition : Potier triangle;
Asynchronous electric machine (8 hours of front lesson and 2 hours of exercise)
Mechanical structure and geometry; generality; Mathematical modelling in steady state condition
Equivalent circuit; Circular diagram
Teaching Methods
Introduction to the Electrical Machine course (1 hour of lecture): description of the course contents and description of the methodology for learning assessment.
The basic laws of electromagnetism (6 hours of frontal lesson)
The transformer (8 hours of lecture and 2 hours of exercise)
General Approach for modelling rotating machines (15 hours of lecture and 4 hours of exercise)
Synchronous electric machine (10 hours of lecture and 4 hours of exercise)
Asynchronous electric machine (8 hours of front lesson and 2 hours of exercise)
Teaching Methods
Introduction to the Electrical Machine course (1 hour of lecture): description of the course contents and description of the methodology for learning assessment.
The basic laws of electromagnetism (6 hours of frontal lesson)
The transformer (8 hours of lecture and 2 hours of exercise)
General Approach for modelling rotating machines (15 hours of lecture and 4 hours of exercise)
Synchronous electric machine (10 hours of lecture and 4 hours of exercise)
Asynchronous electric machine (8 hours of front lesson and 2 hours of exercise)
Verification of learning
There are two tests to be performed: the first one during the course in the periods defined by the Faculty for these activities and the second at the end of the course . These tests aim at verifying the learning of the topics discussed before the tests are carried out. In addition, a final oral test is to be carried out for the assessment and verification of unknown knowledge during the written tests or for which the results are not sufficient for their preparation.
Verification of learning
There are two tests to be performed: the first one during the course in the periods defined by the Faculty for these activities and the second at the end of the course . These tests aim at verifying the learning of the topics discussed before the tests are carried out. In addition, a final oral test is to be carried out for the assessment and verification of unknown knowledge during the written tests or for which the results are not sufficient for their preparation.
Texts
I. Marongiu, E. Pagano “I Trasformatori” ed. LIGUORI Napoli
I. Marongiu, E. Pagano “Le Macchine Elettriche” ed. MASSIMO Napoli
M. Kostenko, L. Piotrovshy “Electrical Machines”
A.E. Fitzgerald, C. Kingsley “Electrical Machines”
Texts
I. Marongiu, E. Pagano “I Trasformatori” ed. LIGUORI Napoli
I. Marongiu, E. Pagano “Le Macchine Elettriche” ed. MASSIMO Napoli
M. Kostenko, L. Piotrovshy “Electrical Machines”
A.E. Fitzgerald, C. Kingsley “Electrical Machines”
More Information
Presentations are available on the teaching web site will be used as teaching support systems.
More Information
Presentations are available on the teaching web site will be used as teaching support systems