37772 - Design Methodologies of Electrically-Operated Machines M

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 final test include:

a) Discussion on the report produced on the basis of the assigned machine design.

b) Oral discussion based on the main subjects of the Course

Teaching tools

Blackboard, overhead projectors and PC based presentations are employed during lessons.

Office hours

See the website of Giovanni Serra