Politecnico di Torino
Politecnico di Torino
Politecnico di Torino
Academic Year 2017/18
Electric traction
Master of science-level of the Bologna process in Mechanical Engineering - Torino
Teacher Status SSD Les Ex Lab Tut Years teaching
Vaschetto Silvio   A2 ING-IND/32 48 12 0 0 4
SSD CFU Activities Area context
ING-IND/32 6 D - A scelta dello studente A scelta dello studente
Subject fundamentals
The subject presents the characteristics of the electric machines and drives widely adopted in the electric/hybrid propulsion for rail traction and road vehicles; some elements are also addressed to cable systems, ship propulsion and the perspective in the aircraft systems. For the different applications, the principal architectures and components (motors, power electronics converters and control systems) are discussed and analysed on the basis of the performance required to the propulsion system.
Expected learning outcomes
The objective of the subject is to provide the system knowledge to evaluate the issues related with the electric drives for the propulsion in the transport systems. The objective implies to develop in the student the capabilities to:
• know the applications and the design constraints for the electric drives in the different transports systems, in particular in the rail and road systems;
• know the principles of functional design and technical specification of electric drives; particular attention is paid to the interaction with the vehicle (mechanical coupling) and with the supply system;
• know the different technology options in connection with the required performances and duties;
• know the dynamic behavior of the electric drives and estimate the boundary conditions for their exploitation in the application framework.
Prerequisites / Assumed knowledge
The recommended curriculum includes at least the knowledge of Mechanics, Circuit theory and Electric Machines.
• Introduction and historical notes in the use of the electric energy in transport systems.
• State of the art and trends, "more electric transports".
• Elements on principal rotating electric machines.
• Electric machines adjustment.
• Components and power electronics converters (functional aspects).
• Control systems and strategies for electric drives (principal characteristics).
• Electric power supply systems.
• Mechanical coupling systems.
• Energy and thermal issues.
• On-board integration issues.

• Electric networks for rail traction and substations for railway supplies.
• Direct current traction systems with rheostatic adjustment.
• Direct current traction systems with electronic adjustment.
• Alternate current traction systems.
• Multi-voltage locomotives.
• Electric multiple units for high speed transport by rail.
• Diesel-hybrid traction systems.

• On board energy storage/generation.
• Traction systems for pure electric vehicles.
• Charging equipment and infrastructures.
• Hybrid traction architectures: series, parallel, series/parallel.
• Interactions with the thermal engine.
• Elements on aerospace applications: The More/All Electric Aircraft / More Electric Engine.

Delivery modes
Delivery modes
The classroom exercises are focused on examples of preliminary specifications of technical requirements based on the knowledge provided during the lectures. At the student will be requested the preparation of a technical document concerning the preliminary specifications of an electric propulsion system.
Texts, readings, handouts and other learning resources
Educational material used during lessons and applications shall be let available to the students.
For a better knowledge of the subjects:

• L. Guzzella, A. Sciarretta, 'Vehicle Propulsion Systems - Introduction to Modeling and Optimization', Springer-Verlag, Berlin Heidelberg, 2005;

• Husain, 'Electric and hybrid vehicles: design fundamentals', CRC Press, 2010;

• G. Vicuna, 'Organizzazione e tecnica ferroviaria', CIFI Ed, 1986.
Assessment and grading criteria

The assessment implies a written exam aimed at evaluating the student’s competences on specific topics included in the teaching program, such as the knowledge of the applications, working principles and technological options for the electric drives for transportation. Moreover, the competence level of the candidate will also be evaluated in terms of capability in preliminary technical specifications of performance, features and characteristics of electric drives for the applications.
The examination consists of a written test, lasting indicatively 2 hours, having two essay questions, one exercise and at least ten multiple-choice questions concerning specific arguments of the teaching program. To take the exam the student must book the exam through the Teaching Portal. During the written test, textbooks, notes and formularies cannot be consulted. Moreover, it is not possible to bring in the classroom electronic devices having web access (e.g., smartphone, smartwatch and tablet). It is permitted the use of the calculator.
The examination is passed if the written test gets a mark from 18/30 up to 30/30 (including the laude). The mark will be communicated to the students through a message on the Teaching Portal, approximately two/three days after the test. The students can look at the corrected test and its mark during a general meeting typically scheduled two/three days after the publication of the marks. The date of the meeting will be communicated to the students through a message on the Teaching Portal.

Programma definitivo per l'A.A.2017/18

© Politecnico di Torino
Corso Duca degli Abruzzi, 24 - 10129 Torino, ITALY
WCAG 2.0 (Level AA)