Electric Drives

Academic year
Subject Area
Language of Instruction
Mode of Delivery
ECTS Credits
2nd Cycle Studies - Mestrado

Recommended Prerequisites

Electric Machines; Power Electronics

Teaching Methods

Theoretical lectures in the black board and with the aid of Powerpoint slides for the presentation of the concepts, principles and fundamental theories about the topics covered in the curricular unit. Theoretical-practical classes to solve problems and exercises that illustrate the application of the theoretical concepts to real cases in the engineering world. In these classes, some simulations in Matlab/Simulink environment are performed to simulate the behaviour of the systems under study. Laboratory classes to validate the theoretical and practical concepts addressed in the curricular unit.

Learning Outcomes

After enrolling in this curricular unit, the student should be able to recognize, select and apply adequately the different components of an electric drive, especially its electric, electronic and mechanical components. He should be able to apply the generalized theory of electric machines in the development and implementation of vector control systems of the ac machines used in industry nowadays. Lastly, students should get a transversal/integrated view of the knowledge associated to the fields of electric machines, power electronics and control.

Work Placement(s)



Introduction to electric drives. Study of the mechanical system of an electric drive.

Generalized theory of electric machines: space phasor – definition and basic properties; equations of voltage, flux, power and torque of synchronous and asynchronous machines; reference frame transformations; alfa-beta-zero transformation; Park transformation.

Speed variation and scalar control: operation of asynchronous motors at variable frequency; methods of speed control of three-phase induction machines; scalar control. Soft-starters.

Vector control: fundamentals of vector control; rotor field oriented control (RFOC) and direct torque control (DTC) of three-phase induction motors and permanent magnet synchronous motors (PMSMs). Predictive control of electric drives.

Head Lecturer(s)

Sérgio Manuel Ângelo da Cruz

Assessment Methods

Laboratory work reports: 20.0%
Project: 25.0%
Frequency: 55.0%


J. Pyrhönen, V. Hrabovcová, R. Semken: "Electrical Machine Drives Control - An Introduction", John Wiley & Sons, 2016.

H. Abu-Rub, A. Iqbal, J. Guzinski: “High Performance Control of ac Drives with Matlab/Simulink Models”, John Wiley & Sons, 2012.

S. K. Sul: “Control of Electric Machine Drive Systems”, Wiley-IEEE Press, New Jersey, 2011.