17991 - Electrotechnics

Learning outcomes

The aim of the course is to provide basic knowledge about electrical circuit theory, circuit analysis methods and operating principles of  electric machines.

Course contents

Basic concepts
Circuit elements. Voltage and current. Power and energy. Passive and active elements. Sign conventions.
Kirchhoff's laws. Network topology.

Resistive circuits
Resistors. Independent voltage and current sources. Series and parallel circuits. Current and voltage dividers. Source transformations.
Nodal and mesh analysis. Superposition principle. Thevenin's and Norton's theorems.

Sinusoidal steady state analysis
Capacitors. Inductors.
Phasors. Impedance and admittance. Circuit analysis in the phasor domain
Power in AC circuits: active, reactive, apparent. Complex power.
Power factor correction. Maximum power transfer. Resonance.
Three-phase systems: wye and delta loads, balanced and unbalanced systems, power in three-phase systems.

Transient analysis
First order RC and RL circuits. Transient and steady state respose.
Zero input and zero state respose. Second order RLC circuits.

Electric machines
Magnetic circuits. Hopkinson's law. Self and mutual inductuction.
Power losses in electrical machines.
Transformers: principle of operation, quations, equivalent circuit, short and open circuit tests, efficiency.
Rotating magnetic field.
Induction machines: Principle of operation, equations, equivalent circuit, characteristics.
DC machines: Principle of operation, DC motors and generators, equations, characteristics.

Readings/Bibliography

Lecture slides are available at the following address:
http://www.die.ing.unibo.it/pers/mastri/didattica.htm

- P. Ghigi, M. Martelli, F. Mastri. Esercizi di Elettrotecnica. Società Editrice Esculapio.
- P. Ghigi. Lezioni di Elettrotecnica. UTET.
- V. Daniele. A. Liberatore, R. Graglia, S. Manetti. Elettrotecnica. Monduzzi Editore.
- F. Ciampolini. Elettrotecnica generale. Pitagora Editrice.

Teaching methods

Theoretical lessons and numerical exercises.

Assessment methods

Written examination.

Teaching tools

Links to further information

http://www.die.ing.unibo.it/pers/mastri/didattica.htm

Office hours

See the website of Franco Mastri