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BL30A1001 Electrical Drives, 8 cr / 4.44 cu 
Code BL30A1001  Validity 01.08.2010 -
Name Electrical Drives  Abbreviation Electrical Driv 
Credits8 cr / 4.44 cu   
TypeBasic studies  
  Grading scaleStudy modules 0-5,P/F 
  Eligibility for post-graduate studiesYes
    Allowed to study several timesno
Organisation LUT School of Energy Systems 

Lassi Aarniovuori 
Juha Pyrhönen 

Description by Study Guide
Note  Location: Lappeenranta

The first part (2nd period) will be studied in collaboration with BL30A1020 Electrical Drives, Compact. Common lectures, exercises and homework. The student may participate either in “Electrical Drives, Compact” or “Electrical Drives”, not in both of them.

Year  M.Sc. (Tech.) 1 
Period  2-3 
Teaching Language  English 
Teacher(s) in Charge 

Professor, D.Sc. (Tech.) Juha Pyrhönen


Upon completion of the course the student will be able to: 1. understand the role of electrical drives, 2. understand different torque producing principles in different machines, 3. model and simulate a DC motor drive, 4. describe the principles of scalar, vector and direct torque control of rotating field machines, 5. define and understand the functioning of the most important power electronic converters, 6. discuss the principles of PWM in general, space vector modulation and DTC, 7. model the behaviour of permanent magnet synchronous machine by using vector equivalent circuits and vector diagrams, 8. understand synchronous machine control in details, 9. understand synchronous reluctance machine control in details, 10. understand the role of induction machine and its control in details, 11. know the switched reluctance machine control principles, 12. discuss the adverse effects of PWM systems on motor behaviour and the wave nature of the motor cable. Mastering the course material well gives the student comprehensive understanding of the basics of electrical drives and wide possibilities to work in the field. This is the course for drives professionals.


Theory of electric motor drives, operation and vector equivalent circuits. Synchronous machine drives, asynchronous machine drives, synchronous reluctance machine drives, permanent magnet synchronous machine drives, switched reluctance motor drives. Torque production in different machines. Power electronic converters suitable for motor and generator drives. Scalar control, vector control, direct flux linkage control and direct torque control (DTC). Motor cable wave nature, bearing currents. Applying the principles for practical electrical machine types.

Teaching Methods 

Lectures 24 h, tutorials 24 h, 2nd period. Lectures 24 h, tutorials 24 h, 3rd period. Independent study including homework tasks 109 h. Examination 3 h.
Total workload 208 h.

Suitability for doctoral studies (Yes/Leave empty)  Yes 
Examination in Examination schedule (Yes/No)  No 
Examination in Moodle (Yes/No)  Yes 
Examination in Exam (Yes/No)  No 
Assessment scale and assessment methods 

0-5, written examination 100 %.
OR Pass/fail via good enough independent homework.

Course Materials 

Lecture material in Moodle.

The course is based on the book: Pyrhönen, Hrabovcova, Semken: “Electrical Machine Drives Control: An Introduction”, published by John Wiley et Sons 2016


The students are recommended to have completed the courses BL30A0000 Electric Circuits, BL10A0100 Basics of Electric Engineering, BL30A0500 Introduction to Electrical Drives and BL30A0800 Electromagnetic Components and to have attended the course BL30A0400 Design of an Electrical Machine./Edited 8.10.2018/ml

Places for exchange-students? (Yes, number/No)  max 15 
Places for Open University Students?(Yes, number/No)  max 5 

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