- Docente: Fiorenzo Filippetti
- Credits: 3
- SSD: ING-IND/32
- Language: Italian
- Teaching Mode: Traditional lectures
- Campus: Bologna
- Corso: First cycle degree programme (L) in Electric Engineering (cod. 0047)
Learning outcomes
The aim of the course is to give to the students a general methodology for the electrical machine design. During the course the power transformers and the induction motors will be assumed as practical cases.
Course contents
References on magnetic circuits
Magnetic circuits. Magnetic materials. Magnetic potential and reluctance. Utilization of magnetic materials, aircores. Magnetic circuit lows. Magnetization characteristic. Analysis and design of magnetic circuits.
Design
Design procedure of an equipment: initial machine dimensions and verification calculation; specifications, constraints and output requirements. The feasible design. The optimum design. Verification and criteria for updating the design choices.
General issues on the dimensioning of electrical machines
General design formulas. Utilization coefficients. Similar machines. Normalization of the dimensions and the powers. Types of cooling and types of service. Initial transformer dimensions. Initial induction motor dimensions. Initial dimensions of other machines (notice).
Transformer design
Specifications, constraints, output requirements. Magnetic circuit and turn number calculation. Windings calculation. Calculation of the insulating thickness and of the axial and radial overall dimensions. Calculations of verification for efficiency, losses ratio and voltage drop. Calculation of the short circuit voltage and the no-load current. Dimensioning of the container. Thermal verification.
Elements of computer aided design
CAD of electrical machines. Design formulas: the case of the transformer, the case of the induction motor. Mathematical algorithms for updating the design choices: the method of the pivot function; the method of the dispersion; other algorithms. Logical Flow-chart of a program for automatic design. Software environments suitable for the automatic design.
Readings/Bibliography
R. Sacchetti: Calcolo delle macchine elettriche, Pitagora Editrice, Bologna
E. Pagano, A. Perfetto: Costruzioni elettromeccaniche, Editrice Massimo, Napoli
G. Someda: Costruzione delle macchine elettriche, Editrice Patron, Bologna
Teaching methods
Lectures and computer aided design
Assessment methods
The final exam consists of a written part and an oral part
Teaching tools
Software workbenches for the machine design
Office hours
See the website of Fiorenzo Filippetti