ELECTRICAL MACHINES

The course is aimed to provide the basic and advanced knowledge on electrical machines as required in modern applications and preliminary for the machine control. The study of the electrical machines will begin stating the operating principles of the machines and their equivalent circuits, therefore, it will continue with the study of the dynamic operation and models. About the rotating ac machines, also the equivalent circuit at qd0 will be introduced according to the generalized theory of electrical machines (or of the arbitrary references frames). After completing the course, the student will acquire the enabling knowledge for using the electric machines in static and dynamic loads in all industrial and civil applications with particular attention to energy saving, for example electrical traction, energy production and conversion, renewable energy.

Topic 1: Fundamentals of Electric Circuits (review)

Topic 2: Magnetic Circuits and Magnetic Materials

Topic 3: Transformers

Topic 4: Introduction to Rotating Machines

Topic 5: AC Machines

Topic 1: Fundamentals of Electric Circuits (review)

• Phasor theory
• Three-phase circuits
• Real, reactive and complex power

Topic 2: Magnetic Circuits and Magnetic Materials

• Flux Linkage, Inductance and Energy
• Electromechanical- Energy-Conversion Principles
• Heating

Topic 3: Transformers

• Single phase and three-phase transformer
• Principles of operation
• Steady-state equivalent circuits
• No-load and short-circuit condition

Topic 4: Introduction to Rotating Machines

• Principles of operation and steady-state equivalent circuits of a dc machine
• Speed-Torque characteristics of a separately excited dc machine
• Space-phasor theory: the dq0 transformation
• Rotating magnetic field

Topic 5: AC Machines

• Principles of operation and steady-state equivalent circuits of a synchronous machine
• Theory and models of synchronous machine with and without saturation: Behn-Eshemburg, Potier, qd axes, Arnold-Blondel
• Capability curves of a synchronous machine
• Principles of operation and steady-state equivalent circuits of an induction machine
• Speed-Torque characteristics of an induction machine
• Model of synchronous and induction machines in qd0 reference frame
• Torque equations

1. Electric Machinery by A. E. Fitzgerald, C. Kingsley, Jr., S. D. Umans. , 7th Edition, McGraw-Hill, 2013
2. Electric Machinery Fundamentals by Stephen J. Chapman, 4^th Edition, McGraw-Hill, 2005
3. Macchine Elettriche by S. Crepaz, CittàStudi, 1996
4. Analysis of electric machinery by P.C. Krause, Mc Graw Hill, 1986
5. Electrical Machines voll. l e 2 by M. Kostenko, L. Piotrovski, MIR Mosca libreria Italia-URSS
6. Macchine Elettriche by A. Consoli, Notes
7. Slides presented at the lessons