- Docente: Ugo Reggiani
- Credits: 6
- SSD: ING-IND/31
- Language: Italian
- Teaching Mode: Traditional lectures
- Campus: Bologna
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Corso:
Second cycle degree programme (LM) in
Electrical Energy Engineering (cod. 8611)
Also valid for First cycle degree programme (L) in Electrical Engineeing (cod. 0922)
Learning outcomes
Understanding and application of the fundamental laws of electromagnetics to model electrical and magnetic devices and explain their operation.
Course contents
Introduction to the laws of electromagnetics
Electromagnetic field sources. Electromagnetic field vectors. Constitutive laws. Laws of electromagnetics in integral form: fundamental laws and their consequences. E.m.f. and electrical voltage. Faraday's law, transformer and motional e.m.f's. Elements of vector analysis. Laws of electromagnetics in point form. Electric circuit and magnetic circuit according to field theory. Classification of electromagnetic field problems. Energy of the electromagnetic field.
Electrostatic field
Equations and electrostatic potential. Electrostatic field for a system of conductors. Capacitance and potential coefficients. Partial capacitances. Electrostatic shielding. Capacitors and capacitance. Electrostatic energy stored in a capacitor. Calculation of the capacitance of structures. Capacitance of a coaxial cable and of two-wire transmission line.
Steady-state electrodynamics
Steady electric and current fields
Distribution of the current field in a conductor supplied by a DC voltage. Ohmic resistance of a conductor. Analogy between electrostatic field and steady current field.
Magnetic field of steady currents
Equations and magnetic vector potential. Methods for the calculation of the magnetic field of steady currents. Self- and mutual-inductances. Magnetic energy stored in an inductor. Calculation of the inductances of structures. Self-inductance of a coaxial cable and of two-wire transmission line.
Time-varying electrodynamics
Ohm's law for time-varying fields.
Magnetic circuits
Properties of ferromagnetic materials. Magnetic circuits in DC: simplifying assumptions, direct and inverse problems. Permanent magnets: operation and design.
Readings/Bibliography
- M. D'Amore, Elettrotecnica, Vol. I. Edizioni Siderea, Roma, 1994.
- C. Christopoulos, An Introduction to Applied Electromagnetism. J. Wiley, Chichester, 1990.
- C. R. Paul, Electromagnetics for Engineers with Applications. Wiley International Edition, 2004.
- S. M. Wentworth, Fundamentals of Electromagnetics with Engineering Applications. Wiley International Edition,2005.
Teaching methods
Numerous example problems are worked-out for reinforcement of the course material.
Assessment methods
Final oral test.
Office hours
See the website of Ugo Reggiani