Objectives and competences
The objective of this course is for students to be able to demonstrate understanding of the theoretical basis about electric drives and be able to analyse practical solutions.
Content (Syllabus outline)
Introduction: elements of electric drives, steady state characteristics of motors and loads, stable and unstable operating points, condition of stability, moment of inertial, basic equation of motion, steady-state and transient states of electric drives, multiquadrant operation.
Direct current (DC) motor: separately excited, shunt, series, compound motor, PM motor, basic equations, speed-torque characteristics, effect of armature voltage, field voltage and armature resistance on motor speed, starting, braking and loading of a motor, static converters, speed and torque control methods, cascaded motion control, applications of DC drives.
Induction motor: motor with cage-type rotor, with wound rotor, basic equations, speed-torque characteristics, effect of magnitude or/and frequency of terminal voltage, of stator or rotor resistance and inductance on motor speed, starting, braking and loading of a motor, basic principles of speed control, U/f and I/f speed control, converters for AC drives, voltage source converters, current source converters, speed and torque control, applications of AC drives.
Synchronous motor: basic equations, speed-torque characteristics, speed control, applications of drives.
Dynamic of electric drives: basic equations, typical transient phenomena, computation of the energy losses, methods for the reduction of losses, the travelling time computation.
Basis of thermal protection: heating of a motor, current and temperature measurement, protection devices, bimetal protection, current relay and electronic protection.
Learning and teaching methods
• lectures, seminar, computer exercises, laboratory work, individual work, study of literature, communication and cooperation, computer-aided work, graphic presentations of examples from lectures and exercises
Intended learning outcomes - knowledge and understanding
• describe, interpret and design electric machines characteristics in the different operation modes of electric drives,
• perform and evaluate measurements on electric drives,
• analyse, compare and evaluate different solutions in electric drives,
• apply theoretical and practical approaches to design electric drives
Intended learning outcomes - transferable/key skills and other attributes
Communication skills: oral lab work defence, oral examination defence, manner of expression at written examination.
Use of information technology: use of a different software tools for simulation and control of electric drives.
Calculation skills: calculating the characteristic of electrical machines in different operation modes.
Problem solving: solving problems with selection of electric motors in the electric drive systems.
Working in a group: working with real electric drives, group solving exacting homework of electric drives.
Readings
• M. Trlep: Električni pogoni – zbrano gradivo, Univerza v Mariboru, Fakulteta za elektrotehniko, računalništvo in informatiko Maribor, 2020.
• V. Ambrožič, P. Zajec: Električni servo pogoni, Založba: Slovensko združenje elektroenergetikov CIGRE, Ljubljana, 2016
• I. Boldea, S. A. Nasar: Electrical Drives, CRC Press, New York, 2016.
• M. A. El.-Sharkawi: Fundamentals of Electric Drives, CENGAGE Learning Custom Publishing, 2017.
Additional information on implementation and assessment Written and oral exams can be replaced by colloquia
