### Electric Drives

#### Course Description

Historical development, overview and classification of electric drives. Drives with DC, induction, synchronous, and brushless DC motors. Servo drives. Startup and braking techniques. Drive systems. Special purpose drives. Drive safety functions. Examples of complex drive systems. Selection of drive components. Electromagnetic compatibility. Drive malfunctions.

#### Learning Outcomes

1. differentiate types of electric drives
2. define servo drive
3. compare the techniques of starting and braking operation
4. analyze drive system
5. analyze safety functions of drives
6. analyze the electromagnetic compatibility of drives
7. differentiate types of drive failures

#### Forms of Teaching

Lectures

classical lectures using blackboard in combination with PowerPoint slides

Seminars and workshops

For an example of a concrete electric motor drive from industrial practice, it is necessary to calculate the mechanical requirements of the working mechanism for a given drive dynamics, to select the appropriate power converter, the driving electrical machine, and the switching and protective devices, to size the brake assembly (chopper and resistor)

Exercises

solving numerical examples related to the content of the lectures

Continuous Assessment Exam
Seminar/Project 50 % 40 % 50 % 40 %
Mid Term Exam: Written 33 % 30 % 0 %
Final Exam: Oral 30 %
Exam: Written 50 % 40 %
Exam: Oral 20 %

#### Week by Week Schedule

1. Basic components of an electric drive, modelling of mechanical drive parts, basic operating conditions of an electric drive, load types, load torque, mechanical characteristics of working mechanisms
2. Motoring and braking regimes of an electric drive, static and dynamic states of electric drives, equivalent values of the parameters of an electric drive
3. Brushed DC motor drives, induction motor drives
4. Permanent magnet synchronous motor drives, brushless DC drives
5. Power losses, methods for reducing losses, energy efficient drives
6. Criteria for selecting the optimal drive types, selection of motor (thermally equivalent operating point) , single-drive systems, complex multi-drive systems
7. Drives with integrated technological functions, electrical traction systems (overview of traction system, force-speed curve, selection of electric drive, and other equipment)
8. Midterm exam
9. Servo drives (classification
10. Drive solutions for explosive atmospheres
11. Safety function for drives
12. Electromagnetic compatibility of drives, faults and troubleshooting motor drives
13. Project
14. Project
15. Final exam, Project

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#### Literature

Subrahmanyam (2011.), Electric Drives: Concepts & Appl, 2/E, Tata McGraw-Hill Education
Jens Weidauer, Richard Messer (2014.), Electrical Drives, Publicis
Ned Mohan (2000.), Electric Drives, University of Minnesota Printing services
Berislav Jurković (1983.), Elektromotorni pogoni,
Rik De Doncker, Duco W.J. Pulle, André Veltman (2010.), Advanced Electrical Drives, Springer Science & Business Media

#### General

ID 222487
Winter semester
5 ECTS
L1 English Level
L1 e-Learning
45 Lectures
0 Seminar
15 Exercises
0 Laboratory exercises
0 Project laboratory