Lecturer: Ezio Bassi  

Course name: Dinamica e regolazione di azionamenti elettrici
Course code: 064005
Degree course: Ingegneria Elettrica
Disciplinary field of science: ING-IND/32
The course relates to:
University credits: CFU 5
Course website: n.d.

Specific course objectives

The course gives an overview on various items concerning the electrical drives including their dynamic behavior; various regulation schemes are introduced, principally with induction and brushless motors, with different solutions as to the controlled variables and the regulation algorithms.

Course programme

The course is centered on the behavior of electrical machines fed by electronic converters: their dynamic models are presented together with the way they can attain the required performances. The following issues are particularly developed:

• Induction motor: dynamic model and instantaneous torque, d-q (Park) transfomations and equations in vectorial form; direct and indirect Field Oriented Control; Direct Torque Control; reconstruction of rotor and stator flux; field weakening operation; Current-Source Inverter Drive with regeneration.
• Permanent Magnet Synchronous Motor: magnets, construction and types of rotor, e.m.f. induced in the stator windings; magnet and reluctance torque; d-q dynamic model; closed-loop torque and speed control; field weakening operation.
• A.C. current control: control of the currents of a three-phase system (i.e. motor) in different reference systems (abc, αβ, dq); PI regulators; Hysteresis regulators; predictive control; compensation of dq coupling terms.
• Space Vector PWM: inverter configurations, voltage reference and basic principles of the method, definition of the exagon and overmodulation, optimal sequence of inverter states, limitation of switching frequency and current ripple.

Course entry requirements

Steady state behavior of converter-fed electrical machines, basic power electronics, basic automatic control.

Course structure and teaching

Lectures (hours/year in lecture theatre): 30
Practical class (hours/year in lecture theatre): 20
Practicals / Workshops (hours/year in lecture theatre): 2
Project work (hours/year in lecture theatre): 0

Suggested reading materials

W. Leonhard. Control of Electrical Drives. Springer Verlag, 1996.

B. K. Bose. Power Electronics and Variable Frequency Drives. Technology and Applications. IEEE Press, 1997.

L. Bonometti. Convertitori di potenza e servomotori brushless. UTET, 2001.

Mohan, Undeland, Robbins. Elettronica di potenza. Convertitori e applicazioni. Hoepli, 2005.

E. Bassi. Lecture notes - Available only for some topic of the course.

Testing and exams

Oral exam (about one hour).