- Docente: Giovanni Serra
- Credits: 6
- SSD: ING-IND/32
- Language: Italian
- Teaching Mode: Traditional lectures
- Campus: Bologna
- Corso: Second cycle degree programme (LM) in Electrical Energy Engineering (cod. 9066)
Learning outcomes
The aims of the Course are to train the students to the specific knowledge regarding the traditional methodologies for the analaysis and the design of the electrical machines. Furthermore, the appropriate use of simulation software and thermal and electromagnetic field analysis will be presented and discussed. After passing this course, students will be familiar with issues involved in design techniques, thermal and electromagnetic field analysis.
Course contents
General consideration on the design of the electric machines. Nameplate data. Output machine coefficients. Parameters involved in the design of the electrical machines.
Electrical Engineering Materials: Conducting materials, Soft magnetic materials (Laminations, Composites), Insulation materials, Permanent magnets.
Heating and cooling of electrical machines
Thermal conduction, convection and radiation. Equvalent thermal networks, temperature rise, types of duties and ratings.
Transformers
Magnetic circuit of power transformers, lightning overvoltage distribution, thermal problems. Design procedure for power transformers.
Induction machines
The calculus of the equivalent circuits of a.c. machines. Leakage reactance of a.c windings of coil- and and bar-type. Equivalent circuit and parameter calculation of the double squirrel cage motors.
Design calculations, effects of the parameter design selection. Free and restricted design. Samples of design calculation.
Brushless rotating machines
Design relationships for surface mounted machines
Basic design choices, cogging torque reduction, fractional slot windings
Brushless tubular actuators
Motor topologies, basic design realtionships, optimal design.
Tubular stepping motors
Electromagnetic analysis, basic design relationships, design procedures.
Readings/Bibliography
K.Hameyer and R.Belmans: Numerical modelling and design of Electrical machines and devices, WITpress, Southampton, Boston.
M. Ramamoorty: Computer-aided Design of Electrical Equipment. John Wiley & Sons, New York.
E. S. Hamdi: Design of Small Electrical Machines. John Wiley & Sons, New York.
J. F. Gieras, M. Wing: Permanent Magnet Motor Technology. Marcel Dekker, Inc., New York, Basel.
D. Hanselman: Brushless Permanent Magnet Motor Design. The Writers' Collective, Cranstone, Rhode Island.
J. R. Hendershot, Jr. , T. J. E. Miller: Design of Brushless Permanent-Magnet Motors. Magna Physics Publishing and Clarendon Press, Oxford.
E. Di Pierro: Costruzioni Elettromeccaniche, Ed. Siderea, Roma.
Paper copy of the PowerPoint presentation
Teaching methods
The developed exercises present examples of application of the theoretical subjects.
The development of specific arguments is also proposed leading to a final discussion of the produced report.
Assessment methods
The examination consists in the presentation and discussion of the documents related to the design of electric machines studied during the course.
Alternative methods are also possible, to be agreed with the course teacher.
Teaching tools
Blackboard, overhead projectors and PC based presentations are employed during lessons.
Office hours
See the website of Giovanni Serra