Course-PM

EEN135 EEN135 Electric machines for vehicles and vessels lp3 VT22 (7.5 hp)

Course is offered by the department of Electrical Engineering

Contact details

Name                                  Email

Examiner:        Stefan Lundberg                     stefan.lundberg@chalmers.se Contact info.

Lecturer:          Sonja Lundmark                     sonja.lundmark@chalmers.se             Contact info.

                         Stefan Lundberg                     stefan.lundberg@chalmers.se             Contact info.

 

Tutorial assistant: Sonja Lundmark                sonja.lundmark@chalmers.se             Contact info.

                               Stefan Lundberg                     stefan.lundberg@chalmers.se             Contact info.

 

Laboratory and Project assistants:

                        Hao Chen                                                                    Contact info.

                        Kristoffer Fürst                   kristoffer.furst@chalmers.se   Contact info.

                       Hannes Hagmar                  hannes.hagmar@chalmers.se  Contact info.

                       Sindhu Kanya Nalini Ramakrishna  sindhukanya.naliniramakrishna@chalmers.se Contact info.

                       Artem Rodionov                 artem@chalmers.se                 Contact info.

                     

Course purpose

Electric machines are becoming more and more central in modern propulsion. As an engineer it is therefore important to know the fundamentals of this technology to design and develop propulsion systems. In this course students will learn about the different types of electric machines and how to calculate their output power, efficiency and energy loss. The course also includes overload and field weakening operation of the machines.

Schedule

TimeEdit

Course literature

Electric Motors and Drives : Fundamentals, Types and Applications

By: Austin Hughes; Bill Drury. Edition: Fifth edition. Kidlington : Newnes. 2019. eBook., Database: eBook Index

 

Go to the Chalmers library homepage for e-books https://www.lib.chalmers.se/en/search/ebrary/

Search for “Electric Motors and Drives : Fundamentals, Types and Applications”. In the search results, look for the fifth edition 2019, klick on the link and you can download the book.

 

Lecture notes and handouts will be available on Canvas.

Course design

The course starts with electric circuit theory for AC circuits, the jω-method. With this method the AC quantities are modeled as complex numbers and the circuit elements are described with their impedances, which also are complex numbers. With this the AC circuits can be treated as a “DC circuit”, but with complex numbers, and voltage and currents can be calculated as in DC circuits. The magnetic circuit is introduced and will be the base for the electric machine model. The magnetic circuits are used to build up the stator of 3-phase AC machines. To make the modeling of the 3-phase machine easier the tool of coordinate transformations is introduced. The coordinate transformations mathematically transform three-phase ac motors into a separately-magnetized dc-machine.

 

Using this tool, mathematical models of the induction machine and the permanent magnet synchronous machine are derived. The models are used to understand the operation of the machines both in steady-state and in transients. The models are also used to model the machines in Simulink.

 

The course is divided into four parts A, B, C and D:

• A: Basic simple electrical circuits and magnetic circuits: Voltage, Current, Resistance, Power, Energy, Ohm's law, KVL, KCL, Magnetic flux, Reluctance, MMF, Induced voltage, Inductance, Power, Rotating flux and Park / Clark transformation.
• B: Induction machine: Equivalent circuit (dynamic + stationary), Torque-speed characteristics, Field weakening, Efficiency, losses, Overload capacity
• C: The synchronous machine: Equivalent schedule (dynamic + stationary), Torque speed characteristics, Field weakening, Efficiency, losses, Overload capacity
• D: Laboratory work: Measure on AC circuits and on stationary and dynamic operation of an induction machine. Dynamically simulate an induction and a synchronous machine.

 

In the labs, both the practical and the computer labs, you should work in groups of 2 students.

 

The two practical labs (Lab 1 and 2) are 4 hours labs each with home assignments that should be solved before the lab starts.

 

For the two computer labs (Lab 3 and 4) each group of 2 students can book up to 3 occasions of 30 minutes each with the supervisors. These occasions can be used for getting help and for getting approval of the computer labs.

 

As can be seen in the teaching plan below there are

25 lectures = 50 h

7 tutorials = 14 h

2 practical labs = 8 h

2 computer labs = 2x3x0.5 = 3 h

3 duggor = 6 h

TOTAL: 81 h

 

This leaves 119 h for own work time, which means that you need to work on your own outside scheduled hours.

Teaching plan:

Hao Chen                                HC in the teaching plan          Contact info.

Kristoffer Fürst                                   KF in the teaching plan          Contact info.

Hannes Hagmar                                  HH in the teaching plan          Contact info.

Stefan Lundberg                                 StL in the teaching plan          Contact info.

Sonja Lundmark                                 SL in the teaching plan           Contact info.

Sindhu Kanya Nalini Ramakrishna  SK in the teaching plan Contact info.

Artem Rodionov                                 AR in the teaching plan          Contact info.

 

The column “Teaching method” specifies how the teaching is done:

• “Live” means it is only given at campus in the room specified in TimeEdit
• “Hybrid” means that the teaching is done at campus in the room specified in TimeEdit and it is streamed on zoom
• “Online” means that the teaching is only online on zoom

The zoom room that will be used for this course is: https://chalmers.zoom.us/j/69355298034

with the password: 123456. The online or hybrid lectures and tutorials will be recorded and uploaded on the course page on Canvas after the lecture/tutorial.

Study week, Date, Time	Description / Material	Teaching method	Pages, course compendium / assistant/teacher
1 (3) Tue 18/1  08-10	L1. Course introduction. Repetition of DC circuit theory. Starting with AC circuit theory, the jω-method.	Hybrid	StL
1 (3) Tue 18/1  10-12	L2. AC circuit theory. Representing AC values as phasors, Ohms law for AC and impedance of comp.	Hybrid	StL
1 (3) Wed 19/1  08-10	L3. AC circuit theory. Continue with the jω-method. Power in AC circuits (apparent, active and reactive).	Hybrid	StL
1 (3) Fri 21/1  08-10	L4. Y-connected 3-phase circuits, power in 3-phase AC circuits. Electric hazards and safety.		StL
1 (3) Fri 21/1  10-12	Tutorial 1		StL
2 (4) Tue 25/1  08-10	L5. D-connected 3-phase circuits, YD-transformation, equivalent Y-phase circuit. Measuring AC values.		StL
2 (4) Tue 25/1  10-12	L6. Magnetic circuits, reluctance, coupled magnetic circuits	Online	SL
2 (4) Wed 26/1  08-10	L7. Magnetic circuits continued, induced voltage, force.	Online	SL
2 (4) Wed 26/1  13-17	Lab 1 AC, Group 1a EDIT building, room 3502 Grundkurslab	Live	HC, KF, SK
2 (4) Thu 27/1  13-17	Lab 1 AC, Group 1b EDIT building, room 3502 Grundkurslab	Live	HC, KF, SK
2 (4) Fri 28/1  08-10	L8. Rotating magnetic flux, the stator of 3-phase AC machines. Park and Clark transformation.	Online	SL
2 (4) Fri 28/1  10-12	Tutorial 2	Online	SL
3 (5) Mon 31/1  08-12	Lab 1 AC, Group 1c EDIT building, room 3502 Grundkurslab	Live	HC, KF, SK
3 (5) Tue 1/2   08-12	L9. Induction machine. The parts of the machine, dynamic model	Online	SL
3 (5) Tue 1/2  10-12	L10. Induction machine continued, dynamic and steady-state model.	Online	SL
3 (5) Wed 2/2  08-10	L11. Grid connected induction machine operation, losses and parameter determination.	Online	SL
3 (5) Fri 4/2  08-10	Dugga part A	Live	HC
3 (5) Fri 4/2  10-12	Tutorial 3	Online	SL
4 (6) Mon 7/2  08-12	Lab 2 IM, Group 2a EDIT building, room 3502 Grundkurslab	Live	HC, KF, SK
4 (6) Tue 8/2  08-10	L12. Induction machine converter operated,	Hybrid	StL
4 (6) Tue 8/2  10-12	L13. Simulation model of the induction machine	Hybrid	StL
4 (6) Wed 9/2  08-12	Lab 2 IM, Group 2b EDIT building, room 3502 Grundkurslab	Live	HC, KF, SK
4 (6) Thu 10/2  08-12	Lab 2 IM, Group 2c EDIT building, room 3502 Grundkurslab	Live	HC, KF, SK
4 (6) Fri 11/2  10-12	Tutorial 4		StL
5 (7) Mon 14/2  08-12	Lab 3 Simulation of IM,	Live	HH, SK, AR
5 (7) Tue 15/2  08-10	L14. Cooling of electric motors	Online	SL
5 (7) Tue 15/2  10-12	L15. Scaling of electric motors, examples on IM	Online	SL
5 (7) Tue 15/2  13-17	Lab 3 Simulation of IM,	Live	HH, SK, AR
5 (7) Wed 16/2  13-15	Lab 3 Simulation of IM,	Live	HH, SK, AR
5 (7) Thu 17/2  15-17	Lab 3 Simulation of IM,	Live	HH, SK, AR
5 (7) Fri 18/2  10-12	Tutorial 5.	Online	SL
6 (8) Tue 22/2  08-10	L16. PMSM. The parts of the machine, dynamic model	Online	SL
6 (8) Tue 22/2  10-12	L17. PMSM continued, dynamic and steady-state model.	Online	SL
6 (8) Wed 23/2  08-10	L18. Simulation model of the PMSM, grid connected PMSM operation, losses.		StL
6 (8) Fri 25/2  08-10	Dugga part B	Live	HC
6 (8) Fri 25/2  10-12	Tutorial 6.	Online	SL
7 (9) Mon 28/2  08-12	Lab 4 Simulation of PMSM,	Live	HH, SK, AR
7 (9) Tue 1/3  08-10	L19. PMSM converter operated,		StL
7 (9) Tue 1/3  10-12	L20. Scaling of the PMSM, Reluctance machine, PM assisted reluctance machine.	Online	SL
7 (9) Wed 2/3  08-10	L21. Guest lecture
7 (9) Wed 2/3  10-17	Lab 4 Simulation of PMSM,	Live	HH, SK, AR
7 (9) Thu 3/3  15-17	Lab 4 Simulation of PMSM,	Live	HH, SK, AR
7 (9) Fri 4/3  08-10	Tutorial 7.	Online	SL
7 (9) Fri 4/3  10-12	L22. Guest lecture
8 (10) Tue 8/3  8-10	L23. Different types of stator windings (distributed, concentrated, haipin..)	Online	SL
8 (10) Tue 8/3  10-12	L24. Production methods, Recycling and environmental impact, magnetic materials.	Online	SL
8 (10) Wed 9/3  08-10	L25. Extra lecture	Canceled
8 (10) Fri 11/3  10-12	Dugga part C	Live	HC

 

 

 

Changes made since the last occasion

• It is a new course, all things are new

.

Learning objectives and syllabus

Learning objectives:

 

1. Explain the damage that may occur in the event of improper handling of electrical systems and how to avoid them from an electrical safety perspective and carry out electrical laboratory work in a safe manner.
2. Describe and model ideal components such as inductance, resistance, alternating voltage sources and alternating current sources.
3. Describe the material concepts resistivity and temperature coefficient and to be able to use them in electrical calculations.
4. Apply the fundamental laws that governs and quantities that describe magnetic circuits: magnetomotive force, magnetic flux, reluctance, induced voltage and electromagnetic force.
5. Apply Ohm's law, Kirchhoff's laws, power law and energy calculation to simple AC circuits.
6. Describe how a rotating flux is created in 3-phase AC machines and how it can be modeled in the stationary 2-phase system and in the rotating 2-phase system.
7. Calculate space vectors of voltages, currents and fluxes using the Park and Clark transformations and use these to model 3-phase AC machines. Calculate apparent, active and reactive power as well as energy with space vectors.
8. Explain the build-up (the parts of) and operation of synchronous and induction machines and model the machines both dynamically and stationary.
9. Calculate speed, current, voltage, losses, powers and torques at different loads for both the synchronous and induction machines, based on the equivalent circuits of the machines. 

 

Link to the syllabus on Studieportalen.

Study plan

Examination form

The course examination will involve three intermediate tests and one laboratory work:

1. Part A, 2 credits: Basic simple electrical circuits and magnetic circuits.
   • Assessment: Intermediate test (Dugga). Max. points on the test is 30 points.
2. Part B, 2 credits: Induction machine.
   • Assessment: Intermediate test (Dugga). Max. points on the test is 30 points.
3. Part C, 2 credits: Synchronous machine.
   • Assessment: Intermediate test (Dugga). Max. points on the test is 30 points.
4. Part D, 1.5 credits: Laboratory work.
   • The assessment takes place during the laboratory work.

 

The grading scale for the three intermediate tests is:

• Grade 3 between 12 and 17.9 points
• Grade 4 between 18-23.9 points
• Grade 5 between 24-30 points

 

For the final grade it is required that all parts, A, B, C and D are passed and when it is fulfilled the final grade is based on the summation of the points from parts A, B and C according to:

• Grade 3 between 45-59.9 of the total score from A + B + C
• Grade 4 between 60-74.9 of the total score from A + B + C
• Grade 5 between 75-90 of the total points from A + B + C

 

Only Chalmers Approved calculators are allowed at the exam, see https://student.portal.chalmers.se/en/chalmersstudies/Examinations/Pages/default.aspx

The formula paper is attached to the duggas, you are not allowed to bring your own.