Course syllabus

Course-PM

EEN135 EEN135 Electric machines for vehicles and vessels lp3 VT24 (7.5 hp)

Course is offered by the department of Electrical Engineering

Contact details

Examiner:      Stefan Lundberg   stefan.lundberg@chalmers.se                 

Lecturer:       Sonja Lundmark  sonja.lundmark@chalmers.se                 

Guest Lecturer:  Jimmy Ehnberg   jimmy.ehnberg@chalmers.se

Tutorial assistant: Nimananda Sharma    sharman@chalmers.se       

Laboratory and Project assistants:

Qixuan Wang  qixuan.wang@chalmers.se

Kristoffer Fürst  kristoffer.furst@chalmers.se

Nimananda Sharma  sharman@chalmers.se       

(reserve: Sonja Lundmark sonja.lundmark@chalmers.se)

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.

To be allowed to enter the laboratory (to be able to do the lab) you need to have passed the quiz named "Instructed student - Grundkurslabbet" available on the course Canvas page.

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:

Jimmy Ehnberg                                                              JE in the teaching plan

Nimananda Sharma                                                      NS in the teaching plan  

Kristoffer Fürst                                                              KF in the teaching plan     

Stefan Lundberg                                                            StL in the teaching plan    

Sonja Lundmark                                                            SL in the teaching plan     

Qixuan Wang                                                                 QW in the teaching plan   

Study week, Date, Time	Description / Material	Assistant/teacher
1 (3) Tue 16/1  08-10	L1. Course introduction. Repetition of DC circuit theory. Starting with AC circuit theory, the jω-method.	SL
1 (3) Tue 16/1  10-12	L2. AC circuit theory. Representing AC values as phasors, Ohms law for AC and impedance of comp.	SL
1 (3) Wed 17/1  08-10	L3. AC circuit theory. Continue with the jω-method. Power in AC circuits (apparent, active and reactive).	SL
1 (3) Fri 19/1  08-10	L4. Y-connected 3-phase circuits, power in 3-phase AC circuits. Electric hazards and safety.	SL
1 (3) Fri 19/1  10-12	Tutorial 1	NS
2 (4) Tue 23/1  08-10	L5. D-connected 3-phase circuits, YD-transformation, equivalent Y-phase circuit. Measuring AC values.	SL
2 (4) Tue 23/1  10-12	L6. Magnetic circuits, reluctance, coupled magnetic circuits	SL
2 (4) Wed 24/1  08-10	L7. Magnetic circuits continued, induced voltage, force.	SL
2 (4) Wed 24/1  13-17	Lab 1 AC, Group 1a EDIT building, room 3502 Grundkurslab	KF, QW
2 (4) Thu 25/1  13-17	Lab 1 AC, Group 1b EDIT building, room 3502 Grundkurslab	KF, QW
2 (4) Fri 26/1  08-10	L8. Rotating magnetic flux, the stator of 3-phase AC machines. Park and Clark transformation.	SL
2 (4) Fri 26/1  10-12	Tutorial 2	NS
3 (5) Mon 29/1  08-12	Lab 1 AC, Group 1c EDIT building, room 3502 Grundkurslab	KF, QW
3 (5) Tue 30/1   08-10	L9. Induction machine. The parts of the machine, dynamic model	SL
3 (5) Tue 30/1  10-12	L10. Induction machine continued, dynamic and steady-state model.	SL
3 (5) Wed 31/1  08-10	L11. Grid connected induction machine operation, losses and parameter determination.	SL
3 (5) Fri 2/2  08-10	Dugga part A	SL
3 (5) Fri 2/2  10-12	Tutorial 3	NS
4 (6) Mon 5/2  08-12	Lab 2 IM, Group 2a EDIT building, room 3502 Grundkurslab	NS, QW
4 (6) Tue 6/2  08-10	L12. Induction machine converter operated,	SL
4 (6) Tue 6/2  10-12	L13. Simulation model of the induction machine	SL
4 (6) Thurs 8/2  08-12	Lab 2 IM, Group 2b EDIT building, room 3502 Grundkurslab	NS, QW
4 (6) Thurs 8/2  17-21	Lab 2 IM, Group 2c EDIT building, room 3502 Grundkurslab	NS, QW
4 (6) Fri 9/2  10-12	Tutorial 4	NS
5 (7) Mon 12/2  08-12	Lab 3 Simulation of IM,	KF, NS, QW
5 (7) Tue 13/2  08-10	L14. Cooling of electric motors	SL
5 (7) Tue 13/2  10-12	L15. Scaling of electric motors, examples on IM	SL
5 (7) Tue 13/2  13-17	Lab 3 Simulation of IM,	KF, NS, QW
5 (7) Wed 14/2  13-15	Lab 3 Simulation of IM,	NS, QW
5 (7) Fri 16/2  8-10	Lab 3 Simulation of IM,	KF, NS, QW
5 (7) Fri 16/2  10-12	Tutorial 5.	NS
6 (8) Tue 20/2  08-10	L16. PMSM. The parts of the machine, dynamic model	SL
6 (8) Tue 20/2  10-12	L17. PMSM continued, dynamic and steady-state model.	SL
6 (8) Wed 21/2  08-10	L18. Simulation model of the PMSM, grid connected PMSM operation, losses.	SL
6 (8) Fri 23/2  08-10	Dugga part B	SL
6 (8) Fri 23/2  10-12	Tutorial 6.	NS
7 (9) Mon 26/2  08-12	Lab 4 Simulation of PMSM,	NS, QW,SL
7 (9) Tue 27/2  08-10	L19. PMSM converter operated,	SL
7 (9) Tue 27/2  10-12	L20. Scaling of the PMSM, Reluctance machine, PM assisted reluctance machine.	SL
7 (9) Wed 28/2  08-10	L21. Guest lecture by Jimmy Ehnberg	JE
7 (9) Wed 28/2  10-12 and 13-17	Lab 4 Simulation of PMSM	10-12: NS,QW, SL 13-17: NS, SL
7 (9) Thu 29/2  13-17	Lab 4 Simulation of PMSM,	NS, QW, SL
7 (9) Fri 1/3  08-10	Tutorial 7.	NS
7 (9) Fri 1/3  10-12	L22. Reserve	SL
8 (10) Tue 5/3  8-10	L23. Different types of stator windings (distributed, concentrated, hairpin..)	SL
8 (10) Tue 5/3  10-12	L24. Production methods, Recycling and environmental impact, magnetic materials.	SL
8 (10) Wed 6/3  08-10	L25. Reserve	SL
8 (10) Fri 8/3  10-12	Dugga part C	SL
Fri 15/3  08:30-12:30	Re-Dugga part A,B,C	SL
Fri 31/5  08:30-12:30	Re-Dugga part A,B,C	SL

Changes made since the last occasion

The course responsible person is changed from Hao Chen to Sonja Lundmark.

Learning objectives and syllabus

Learning objectives:

 

1. Explain the damage that may occur in the event of improper handling of electrical systems. Explain 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 resistance, inductance, capacitance, alternating voltage sources and alternating current sources.
3. Describe the material concepts including resistivity and temperature coefficient. Be able to use them in electrical calculations.
4. Apply the fundamental laws that govern the quantities described in 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 Clarke 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.