Teacher:Prof. Giovanni SERRA
Versione
italiana
The course is concerned with theory of the behaviour of the most
used electrical machines. The main topics are the following.
TRANSFORMERS. Basic definitions and construction elements, principle
of operation, machine equations, equivalent circuits and performance. Unbalanced
duty of three-phase transformers, parallel operation, autotransformers,
triple-wound transformers, test transformers. Machine parameter calculation.
General information on AC machines. Windings of alternating current
machines.
INDUCTION MACHINES. Rotating magnetic field, equivalent circuits, torque
characteristics. Starting of three-phase induction motors, speed control.
Single-phase induction motors. Machine parameter identification.
SYNCHRONOUS MACHINES. Basic types of synchronous machine and operating
principle, armature reaction, voltage diagrams, magnetic saturation effects,
torque production, parallel operation, oscillations of synchronous machines.
Parameter calculation.
DC MACHINES. Basic types of DC machines, magnetic circuit, windings,
emf calculation, machine equations. Armature reaction, commutation, compoles,
compensating windings. Characteristics of DC generators and motors.
LINEAR MACHINES. Linear induction motors, DC linear actuators.