ELEC 343: Electromechanics

Spring 2020:


Instructor: Dr. Juri Jatskevich

Office:        Kaiser 3057

Phone:         604–827–5217

Email:          jurij@ece.ubc.ca

My Webpage:        www.ece.ubc.ca/~jurij

Course Webpage:  http://courses.ece.ubc.ca/elec343/


Please always include “ELEC 343” in the subject line of all your emails to me or TAs regarding this course.


Lectures: Tue, Thu:  17:0018:30, MacLeod, Room 228


Class Notes: The students should print their class notes and bring them to each class.



Labs: Electromechanical Devices Laboratory in McLeod 130; Labs Schedule for Spring 2020.

There will be 5 Lab Experiments. Laboratory experiments are an integral part of this course. In order to pass this course, all students are required to addend (attendance will be recorded), conduct all laboratory experiments, perform adequately, and write reports for all experiments. Please see General Information and Laboratory Procedures and Safety Rules. Students have to write Lab Reports and pass the Lab Exam to demonstrate their learned knowledge.


Lab Reports are due one week after the completion of experiment and will normally be collected at the specified due date.


Lab Sections:

L2E –     Mon^  11:00 – 13:00                                     

L2B –     Tue^   13:00 – 15:00              


Lab-0: Lab Safety & Safety Quiz                      Jan. 13 - 18

Lab-1: Linear Solenoid Actuator                       Jan. 27 – 31

Lab-2: PM Brushed DC Motors                        Feb. 10 – 11

Lab-3: Stepper Motors                                       Feb. 24 – 28

Lab-4: PM Syn. and Brushless DC Motors       Mar. 9 - 13

Lab-5: Induction Motors & VFDs                     Mar. 23 - 27


Exams: There will be one Midterm Exam (right after reading week, on Tuesday Feb. 25 in class)

             There will be a Final Exam (April 16, at 19:00, online using UBC’s Canvas and Proctorio)

 Missed exams cannot be made up. In the case of illness (with advanced notice

 and doctor’s note), the weight of Midterm Exam may be added to the

 Final Exam.


Assignments: There will be about 6 assignments throughout the course. Assignments will normally be collected in class at the specified due date. The assignments will be collected and counted, but will not be marked. The solutions will be posted on the web after the due date. Late submission of Assignments will not be accepted after the solutions have been posted on the web. The assignments may be looked at in the end of the term only if the student’s grate is on the pass/fail borderline.  


Quizzes: There will be several short (10-15 min.) quizzes given in the beginning of some lectures. The quizzes will be collected and marked. Missed quizzes cannot be made up and will result in zero mark. In case of illness or other legitimate reason (with advanced notice and doctor’s note), the weight of missed quiz may be added to the Final Exam.


Last Quiz 6: 7 April, Tuesday (online)


Grades: The final grade will be based on the following:

Assignments – 5%

Quizzes – 20%

Lab Reports + Lab Exam – 15%

Midterm Exam – 20%

Final Exam – 40%

Each student must pass the Final Exam (get 50% or more) in order to pass this course. If the mark for the Final Exam is less then 50%, then this failing mark becomes the mark for the whole course.


Cheating Policy: The academic enterprise is founded on honesty, civility, and integrity. This also means you should not cheat, copy, or mislead others about what is your work. Students are encouraged to discuss among themselves the problems in each assignment and lab experiment. However the turned-in assignments, lab reports, and exams must show the individual work and reflect the individual understanding of material by each student. Reports suspected of cheating will not be graded. Cheating on exams will result in zero mark and may qualify for withdrawal form the course and/or suspension from the University. Please see the UBC Regulation on Cheating and Plagiarism (Academic Misconduct). All instances of cheating will be reported accordingly to this policy.

Lab Reports Submission Policy: The Lab Reports will normally be collected in a dedicated drop-in Box on the first level in McLeod building, on the left from the room MCLD 112. The drop-in Box has a label ELEC 343. The TA will be taking the Reports at 4 PM on the due date. All late Reports and must be given directly to the TA who will record time and date of submission. Late submission of Lab Reports will result in reduced marks (10%/day up to 3 days, and zero mark thereafter).




Dexter Lin, email:  dexterlin@ece.ubc.ca;   Office Kaiser 3085

Mohammad Mahdavyfakhr, email: mahdavyfakhr@ece.ubc.ca;   Office Kaiser 3085


TA’s Office Hours: Thursdays – 1 – 2pm, room MCLD 242

                        For other times, send email to arrange a meeting (always include “ELEC 343” in the subject line)


Recommended Textbook: (The assignments and lectures will be based on this book)

P. C. Krause, O. Wasynczuk, S. Pekarek, Electromechanical Motion Devices, 2nd Edition, 2012 (should be available in the bookstore).


Recommended Additional Reading: 


ISBN: 0-471-02295-0

A.E. Fitzgerald, C. Kingsley, S.D. Umans, “Electric Machinery, 6th Edition,” McGraw-Hill 2002,

ISBN: 0-07-366009-4

S.J. Chapman, “Electric Machinery Fundamentals, 3rd Edition,” McGraw-Hill 1999,

ISBN: 0-07-011950-3


Course Outline:

1.   Module 1: Magnetic and Magnetically Coupled Circuits: Review of basic electromagnetic principles, properties of magnetic materials, coupled magnetic circuits, ideal transformer dynamics and steady-state, equivalent circuits, three-phase transformers and connections, steady-state phasor relations [Chap. 1, Appendix C].

2.   Module 2: Electromechanical Energy Conversion: Energy balance, energy in coupling field, electromagnetic forces, basic electromagnets and reluctance devices [Chap. 2]

3.   Module 3: Direct Current Machines: Basic principles, voltage and torque equations, basic types of DC machines, steady-state equations and characteristics, dynamic performance of DC machines, elementary control, basic DC drives [Chap. 3].

4.   Module 4: Stepper Motors: Multi-stack and single-stack variable reluctance motors, permanent-magnet stepper motors, drives and modes of operation [Chap. 9]

5.   Module 5: Rotating magnetic field, windings, mmf, two-phase device, three-phase device, p-pole devices, introduction to the rotating reference frame theory, etc. [Chap. 4 and 5].

6.   Module 6: Synchronous Machines: principle of operation, rotor types, stator & rotor inductances, basic equivalent circuit, steady-state power-angle characteristics, steady-state operating characteristics, synchronous motors, effect of salient pole on power-angle characteristics [Chap. 7].

7.   Module 7: Brushless DC motors: Permanent magnet synchronous machines, 2-phase PMBDC, voltage equations, machine equations in rotor-reference frame, dynamic and steady-state operation, brushless dc motor drives [Chap. 8]

8.   Module 8: Induction Machines: Basic construction and principle of operation, types, rotor slip, voltage equations and inductances, reference frame application, equivalent circuit analysis, torque and power, determination of parameters, single-phase motors, principle of speed control [Chap. 6 & 10]. 


Lecture notes (Modules 1 thought 8) will be posted on the web.

The assignments and lectures will be based on this book:

P. C. Krause, O. Wasynczuk, S. Pekarek, Electromechanical Motion Devices, 2nd Edition, 2012