Electrical Engineering

CLAUDIO BRUZZESE
CLAUDIO BRUZZESE

The student gains knowledge of the problems inherent in the design, construction and operation of the main electrical machines used for electromagnetic/electromechanical energy conversion, and for drives. The design concepts put the student in a position to engage critically with the advanced computational tools for the design of electrical machines (FEM/FEA/CAD).

-Basic and detailed information on the composition and structure of synchronous, asynchronous, dc, magnet, and reluctance machines, and of transformers.
-Ability to qualitative and quantitative analysis of performance and performance limits of electrical machines.
-Use of methods for sizing and design of electric machines.
-Use of advanced simulation tools (CAD, dynamic simulations).
-Notions on the main fault types and detection techniques.

Exam of Electrical Machines

Notions of structure, construction and sizing of electric machines:
-Introduction to electromagnetic/electromechanical energy conversion.
-Magnetic materials: hysteresis, magnetic lamination, solid magnetic materials, permanent magnets, losses.
-Magnetic circuit: structures with saliences and smooth inductors, double-salience, linear and rotary.
-Mechanical calculations: power and torque, moment of inertia, centrifugal force.
-Mechanical design: coupling and tolerances, sliding supports and rolling bearings, shafts.
-Structural materials: steel and cast iron, copper, aluminum.
-Construction of laminated magnetic structures: machining/tooling of laminations; rotor cores and transformer cores.
-Ventilation in rotating machines: cooling system, pressure losses.
-Thermal phenomena in electrical machines: mechanisms of heat transfer, fluid coolers.
-Steady-state heating of rotating machines and transformers: thermal networks, refrigeration.
-Transient thermal phenomena and duty cycle classes.
-Windings for DC machines.
-Windings for AC machines: three-phase lap and wave windings, two-phase and single-phase windings, cage, fractional slots, Roebel bars, star of slots, harmonic problems, magnetomotive force.
-Magnetic leakage and leakage reactance.
-Conductors, resistance, losses.
-Dielectric and insulation materials: insulating liquids, paints, insulating solids.
-Winding construction of rotating machines and transformers.
-Formulas and flow charts for the calculation and sizing of electrical machines.

Diagnostics of electric machines:
-Classification of electrical and mechanical failures.
-Classical and innovative techniques for fault detection.

Notions/exercises of design and calculation tools:
-CAD for electrical machine design: basic equations for the solution of magnetostatic and electrodynamic field problems, the principle of virtual work for force and torque calculation, energy and coenergy of electromechanical systems, finite element softwares.
-Tools for dynamic simulation: linear coupled-circuit models, inductance matrices, complex transformations, numerical integration formulas, the winding function, fault models.

- "Design of rotating electrical machines", J. Pyrhonen, T. Jokinen, V. Hrabovcova, John Wiley and Sons, Ltd, 2008.
- “Theory of electrical machines”, Claudio Bruzzese, Società Editrice Esculapio, 2021.

- “Costruzioni Elettromeccaniche”, Enrico Di Pierro, Edizioni Scientifiche Siderea, Voll. 1, 2.
- “Finite elements for electrical engineers”, Silvester and Ferrari, Cambridge.
- Dispense a cura del docente (integrazioni: Winding function approach, Multiple coupled circuit models, Cenni di diagnostica delle macchine elettriche, etc.).

Frontal/traditional teaching in the classroom accompanied by practical exercises in the classroom.

Attendance at all class lessons is recommended.

Thesis evaluation (project)

Thesis evaluation (project)