ELECTRICAL DRIVES FOR INDUSTRIAL APPLICATIONS
Stampa
Enrollment year
2015/2016
Academic year
2016/2017
Regulations
DM270
Academic discipline
ING-IND/32 (POWER ELECTRONIC CONVERTERS, ELECTRICAL MACHINES AND DRIVES)
Department
DEPARTMENT OF ELECTRICAL,COMPUTER AND BIOMEDICAL ENGINEERING
Course
ELECTRICAL ENGINEERING
Curriculum
SISTEMI ELETTRICI
Year of study
Period
1st semester (26/09/2016 - 13/01/2017)
ECTS
12
Lesson hours
112 lesson hours
Language
Italian/English
Activity type
WRITTEN AND ORAL TEST
Teacher
BASSI EZIO (titolare) - 12 ECTS
Prerequisites
Basic principles of electrical engineering and mechanics, analysis of periodic waveforms, simple differential equations, vector diagrams, basic of electrical machines and power electronics
Learning outcomes
The course outlines in its first half the basic concepts about functional characteristics, design and applications of electrical variable speed drives at steady state, with a few hints on their control and transient behavior. In the second part are addressed items concerning the dynamical behavior of electrical drives: various regulation schemes are introduced, principally with induction and brushless motors, with different solutions as to the controlled variables and the regulation algorithms.
Course contents
Electrical Drives are made up of electric machines fed by static power converters which are properly regulated to drive a load according to the requirements of a given application. They are employed in a variety of industrial processes and for a broad range of power at fixed- or variable-speed, such as with fans, pumps, compressors, in the manufacturing industry, in robotics and automation and for the electric traction. The course describes firstly the basic principles of electrical drives and their stead-stare operation; in the second part are presented items relating to the dynamic behavior of drives and to aspects of control and regulation

General issues on drives
Characteristics of loads and operating requirements to be satisfied by the drive; principle of electromechanic conversion; reversible operation of electrical machines; thermal, electrical and magnetic limits of electric systems; Block diagram of an electrical drive; review of applications

Electrical machines
Electrical machines for production and transformation of electrical energy; operating aspects (steady-state), range of power and efficiency, rated values. D.c. machine: tranfer function, operation fed by SCR rectifier, simple control schemes; induction motor: operation fed from variable-frequency inverter at constant flux; influence of frequency and harmonic equivalent circuit

Power Converters
Static power converters: principle of operation and external characteristics; fields of application; rectifier feeding a d.c. machine: analytical description, continuous and discontinuous operation; 3-phase voltage-sourceinverter: basic operation and PWM control of voltage and frequency (triangular carrier PWM); Front End Converters

Induction motor:
dynamic model and instantaneous torque, d-q (Park) transfomations and equations in vectorial form; direct and indirect Field Oriented Control; Direct Torque Control; reconstruction of rotor and stator flux; field weakening operation; Current-Source Inverter Drive with regeneration.

A.C. current control
Control of the currents of a three-phase system (i.e. motor) in different reference systems (abc, αβ, dq); PI regulators; Hysteresis regulators; predictive control; compensation of dq coupling terms.

Space Vector PWM
Inverter configurations, voltage reference and basic principles of the method, definition of the exagon and overmodulation, optimal sequence of inverter states, limitation of switching frequency and current ripple

Permanent Magnet Synchronous Motor
Permanent Magnets, construction and types of rotor, e.m.f. induced in the stator windings; magnet and reluctance torque; d-q dynamic model; a.c. brushless motors; closed-loop torque and speed control; field weakening operation; d.c. brushless motors: operational features and control.

Synchronous reluctance motors: construction and functional features; control and field-weakening operation.
Teaching methods
The firt 9 cfu of this course are also devoted to the students of both the LM degree in Computer Engineering and of Azionamenti Elettrici per Energetici.

Lectures (hours/year in lecture theatre): 62
Practical class (hours/year in lecture theatre): 48
Practicals / Workshops / Seminars
(hours/year in lecture theatre): 4
Reccomended or required readings
On the Kiro portal can be found many
links and a lot of material (notes, technical papers, technical handbooks, chapters of books etc.).

Here follow a few references both in english and italian.

Legnani, Tiboni, Adamini. Meccanica degli azionamenti, vol.1 - Azionamenti Elettrici. Progetto Leonardo, Bologna 2002.

W. Leonhard. Control of Electrical Drives. Springer Verlag, 1996.

P. Vas - Vector Control of a.c. machines. Clarendon Press, 1994 (fpdf reely downloadable).


B. K. Bose. Power Electronics and Variable Frequency Drives. Technology and Applications . IEEE Press, 1997.

L. Bonometti. Convertitori di potenza e servomotori brushless . UTET, 2001.

Mohan, Undeland, Robbins. Elettronica di potenza. Convertitori e applicazioni. Hoepli, 2005. This book is also available in english with the title: Power Electronics: Converters, Applications and Design. Ed. John Wileys and Sons Inc.

Murphy, Turnbull. Power Electronic Control of AC Motors. Pergamon Press, 1988.

E. Bassi. Lecture notes. Available only for some topic of the course.

Various Authors. Web Links to lecture notes available for a number of topics.
Assessment methods
Oral exam during which the students are required to solve a written exercise on the very basic contents of the course. A written relation on specific subjects and the interest displayed during the lectures can also contribute to the final evaluation
Further information
Oral exam during which the students are required to solve a written exercise on the very basic contents of the course. A written relation on specific subjects and the interest displayed during the lectures can also contribute to the final evaluation
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