Subject: ELECTRIC DRIVES (A.A. 2023/2024)
Unit Electric Drives
Related or Additional Studies (lesson)
Know and understand the fundamentals of static and electromechanical conversion systems.
Learn the configuration of basic power electronic conversion systems, of main electrical machines, either direct current (DC) or alternate current (AC) and of electric drives used in automotive sector.
Learn topology, control principles, input and output characteristics of main DC and AC electric drives.
Develop the ability to model power electronic converters, control system, electrical machines, and full drive systems with reference to application for torque and speed control.
Develop the ability to represent an electric drive in terms of energetic conversion system, for the integration in a multiphisic model of a vehicle.
Fundamentals of electric circuits
Fundamentals of electromechanical conversion systems and fundamentals of electrical machines.
Revision of electromagnetic fields and EM field equations. Revision on ferromagnetic materials and permanent magnets. Current transformer.
Topology and types of DC machines.
Fundamental equations and output mechanical characteristic. Steady state performance. Drives on one, two, four quadrants. Cooling of the machine. Control schemes.
Brushless machines with trapezoidal back emf. Drive topology. Principle of operation and control. Output mechanical characteristics. Performance limitation.
Brushless machine with sinusoidal back emf.
Drive topology. Structure of the machine with surface and internal mount magnets.
Principle of static conversion.
DC/DC basic converter topology. One, two and four quadrant configuration. PWM modulation. Current regulator.
The course includes: theoretical lectures made with the aid of multimedia systems. The didactic material is uploaded before each lecture Training and laboratory activities related to the realization of numerical model of selected energetic conversion systems and of a simple electric drive suitable for automotive application.
The exam includes both a project development and an oral test. The project consists of the development of an electric drive which model is developed using numerical simulation tools introduced during training activity. The text of the project will be delivered to students during classes and will be presented at the exam. The oral test is composed by two parts: 1) presentation of the developed project and validation of the obtained results. 2) testing the knowledge of the theoretical course content.
Knowledge and understanding: through lectures and numerical training, students learn the methods and main analysis techniques of static and electromechanical conversion systems.
Applying knowledge and understanding: through the autonomous project development, numerical exercises and laboratory activities related to computer aided design, students learn how to analyze the main electric drives used in the automotive sector.
Making judgments: through the engineering project development, and the discussion with the teacher, students develop the ability to integrate knowledge and handle complexity, and make choices, even on the basis of incomplete or limited information, including evaluation of impact on production costs and on the environment.
Communication skills: through the presentation of the final project and the consequent discussion with the teacher, students develop the ability to communicate the outcome of a project, using graphical and multimedia aids, in a way that they can be understood by an audience not specialized on the subject.
Per lo studio/For study
The didactic material distributed by the teacher: copy of slides, files and description of the used numerical models.
Per l’approfondimento personale dei contenuti/For the personal deepening of contents:
Stefanos Manias “Power Electronics and Motor Drive System”. Academic Press ISBN: 0128117982