ELECTRICAL ENGINEERING
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- Versione italiana
- Academic year
- 2017/2018
- Teacher
- FABIO PARESCHI
- Credits
- 6
- Didactic period
- Secondo Semestre
- SSD
- ING-IND/31
Training objectives
- The course aims to provide to the student basic notions in order to understand the working principle of an electric network or an electric device, and thereafter, during his/her studies, to deal with more specific courses of industrial electrical or electronic controls and drives.
The main knowledge acquired by the student in the course is related to the working principles of common electric devices, both domestic and industrial. In detail, students will face the generation of electric energy, its geographical distribution and its end use, with particular reference to the most common electric motors. Circuits and devices will be considered both in direct current (DC) and alternate current (AC), both single- and three-phase.
The basic abilities acquired from the student at the end of the course, given an electrical network or an electrical device, can be summarized in: a) being capable to design a simple but effective electrical modeling, thus being able to study its electric behavior; b) being capable of solve simple electrical circuits or networks, i.e., being able to determine electrical quantities (voltage, current, power) of any device in the circuit. Prerequisites
- Fundamentals of mathematic (solutions of linear equations systems and solution of first and second order differential equations) and physic (electromagnetism).
Course programme
- The course is mainly divided into three parts, approximately equal the each other in terms of time and complexity. In the first part (about 20 hours) fundamental electrical quantities are introduced, along to their physical meaning in steady-state (DC). Much attention is given to the solution of simple electric circuits. In the second parts (about 16 hours) reactive elements are introduced, along with the solution of circuits working in periodic regime (AC). The third and last part (about 24 hours) is reserved to study issues in geographical electrical networks and to electrical machines.
• Part one: steady-state circuits (DC, 20 hours)
Fundamental electrical quantities (charge, voltage, current, power), lumped elements modeling and Kirkhhoff current law (KCL) and voltages law (KVL). Solution of simple DC circuits: series / parallel connections, node potential method, mesh current method (loop analysis), Thevenin and Norton equivalence theorem.
• Part two: sinusoidal domain (AC, 16 hours)
Electric field and electric field energy in capacitors with parallel-plate model, magnetic field in solenoidal inductors and field energy. Fundamental properties of magnetic fields. Links between the magnetic and electric fields (Lorentz force, Faraday-Neumann law). Solutions of basic non-steady state circuits. Electrical networks and circuits under sinusoidal domain (alternate currents, AC) definition of phase vector (phasor, or Steinmetz transform), complex impedance and complex power.
• Part three: electric geographical networks electric machines (24 hours)
Electric power geographical networks. Single-phase transformer. Three-phase electric power and hints on three-phase transformers. Electrical safety (grounding techniques, circuit breakers and residual current circuit breaker). Working principles of electric machines, physical meaning of the armature reaction, moving coil transducers. DC motors and generators (dynamo). Working principle and construction aspects of three-phase AC motors and generators (alternators) synchronous and asynchronous, two- and more-pole machines. Special motors: universal motor and single-phase induction motor. Didactic methods
- The course is organized in frontal lectures on all the course’s topics.
Lectures are mixed between theoretical ones and exercises for the solution of electrical circuits and networks. Learning assessment procedures
- The aim of the final test is to verify a minimum level of knowledge of the topic. In particular, any candidate is required to show:
• good acquaintance in the resolution of simple electrical circuits, both DC or AC;
• basic knowledge of the fundamental mechanisms underlying the working principals of electrical power grids and electrical machines, with particular reference to transformers and motors.
The test is divided into two parts, to be completed simultaneosly.
In the first one (about 1h time), the candidate will be asked to solve two simple circuits, the first one in DC and the second one in AC, thus covering the topics considered in the first two parts of the course.
In the second one (either in the form of an oral examination or as a few written questions, accordingly to the number of students) is related to the third part of the course, with questions about energy transmission aspects and electric motor construction.
The final evaluation will take into account results of both exercise- and question-related parts, with almost equal weight, but with a slight preponderance of the exercise-related part. Reference texts
- Giorgio Rizzoni, "Principles and Applications of Electrical Engineering", 5th edition, McGraw Hill, 2005.
The textbook is available at the faculty library. The italian version of the book is also available.
On the course website students can also download some proposed and commented exercises.
