Course syllabus

Course-PM

EEN135 EEN135 Electric machines for vehicles and vessels lp3 VT25 (7.5 hp)

Course is offered by the department of Electrical Engineering

Contact details

Examiner & Lecturer:      

Sonja Lundmark              sonja.lundmark@chalmers.se                         

Tutorial assistants:

Linhua Lai                        linhua@chalmers.se

Sonja Lundmark              sonja.lundmark@chalmers.se                 

                           

Laboratory and Project assistants:

Bowen Jiang                    bowen.jiang@chalmers.se

Linhua Lai                        linhua@chalmers.se

Qixuan Wang                  qixuan.wang@chalmers.se

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

20 lectures = 40 h

8 tutorials = 16 h

2 practical labs = 8 h

2 computer labs = 2x3x0.5 = 3 h

3 duggor = 6 h

TOTAL: 73 h

 

This leaves 127 h for own work time, which means that you need to work on your own outside scheduled hours.

Teaching plan:

Bowen Jiang                                                                  BJ in the teaching plan

Jimmy Ehnberg                                                              JE in the teaching plan

Linhua Lai                                                LL 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 (4) Tue 21/1  08-10	L1. Course introduction. Repetition of DC circuit theory. Starting with AC circuit theory, the jω-method.	SL
1 (4) Tue 21/1  10-12	L2. AC circuit theory. Representing AC values as phasors, Ohms law for AC and impedance of comp.	SL
1 (4) Wed 22/1  08-10	L3. AC circuit theory. Continue with the jω-method. Power in AC circuits (apparent, active and reactive).	SL
1 (4) Fri 24/1  08-10	L4. Y-connected 3-phase circuits, power in 3-phase AC circuits. Electric hazards and safety.	SL
1 (4) Fri 24/1  10-12	Tutorial 1	SL
2 (5) Tue 28/1  10-12	L5. D-connected 3-phase circuits, YD-transformation, equivalent Y-phase circuit. Measuring AC values.	SL
2 (5) Wed 29/1  08-10	L6. Magnetic circuits, reluctance, coupled magnetic circuits, induced voltage, force.	SL
2 (5) Wed 29/1  13-17	Lab 1 AC, Group 1a EDIT building, room 3502 Grundkurslab	BJ, SL
2 (5) Thu 30/1  13-17	Lab 1 AC, Group 1b EDIT building, room 3502 Grundkurslab	BJ, SL
2 (5) Fri 31/1  08-10	L7. Rotating magnetic flux, the stator of 3-phase AC machines. Park and Clark transformation.	SL
2 (5) Fri 31/1  10-12	Tutorial 2	SL
3 (6) Mon 3/2  08-12	Lab 1 AC, Group 1c EDIT building, room 3502 Grundkurslab	BJ, SL
3 (6) Tue 4/2   08-10	L8. Induction machine. The parts of the machine, dynamic and steady-state model.	SL
3 (6) Tue 4/2  10-12	L9. Induction machine continued, Grid connected induction machine operation, losses and parameter determination.	SL
3 (6) Wed 5/2  08-10	Tutorial 3	SL
3 (6) Fri 7/2  08-10	Dugga part A	SL
3 (6) Fri 7/2  10-12	Tutorial 4	LL
4 (7) Mon 10/2  08-12	Lab 2 IM, Group 2a EDIT building, room 3502 Grundkurslab	BJ, QW
4 (7) Tue 11/2  08-10	L10. Induction machine converter operated,	SL
4 (7) Tue 11/2  10-12	L11. Simulation model of the induction machine	SL
4 (7) Thurs 13/2  08-12	Lab 2 IM, Group 2b EDIT building, room 3502 Grundkurslab	BJ, QW
4 (7) Thurs 13/2  17-21	Lab 2 IM, Group 2c EDIT building, room 3502 Grundkurslab	BJ, QW
4 (7) Fri 14/2  10-12	L12. Cooling of electric motors, Scaling of electric motors, examples on IM	SL
5 (7) Mon 17/2  08-12	Lab 3 Simulation of IM,	BJ, QW, LL
5 (8) Tue 18/2  10-12	L13. Scaling of electric motors, examples on IM	SL
5 (8) Tue 18/2  13-17	Lab 3 Simulation of IM,	BJ, QW, LL
5 (8) Wed 19/2  8-10	Lab 3 Simulation of IM,	BJ, QW, LL
5 (8) Fri 21/2  8-10	Lab 3 Simulation of IM,	BJ, QW, LL
5 (8) Fri 21/2  10-12	Tutorial 5	LL
6 (9) Tue 25/2  08-10	L14. PMSM. The parts of the machine, dynamic model	SL
6 (9) Tue 25/2  10-12	L15. PMSM continued, dynamic and steady-state model.	SL
6 (9) Wed 26/2  08-10	L16. Simulation model of the PMSM, grid connected PMSM operation, losses.	SL
6 (9) Fri 28/2  08-10	Dugga part B	SL
6 (9) Fri 28/2  10-12	Tutorial 6.	LL
7 (10) Mon 3/3  08-12	Lab 4 Simulation of PMSM,	BJ, QW, LL
7 (10) Tue 4/3  10-12	Tutorial 7.	LL
7 (10) Wed 5/3  08-10	L17. Scaling of the PMSM, Reluctance machine, PM assisted reluctance machine.	SL
7 (10) Wed 5/3  10-12 and 13-17	Lab 4 Simulation of PMSM	BJ, QW, LL
7 (10) Thu 6/3  13-17	Lab 4 Simulation of PMSM,	BJ, QW, LL
7 (10) Fri 7/3  10-12	L18. PMSM converter operated,	SL
8 (11) Tue 11/3  8-10	Tutorial 8.	LL
8 (11) Tue 11/3  10-12	L19. Different types of stator windings (distributed, concentrated, hairpin..)	SL
8 (11) Wed 12/3  08-10	L20. Production methods, Recycling and environmental impact, magnetic materials.	SL
8 (11) Fri 14/3  10-12	Dugga part C	SL
Fri 21/3  08:30-12:30	Re-Dugga part A,B,C	SL
Tue 3/6  14:0 -18:00	Re-Dugga part A,B,C	SL

 

Changes made since the last occasion

• The course examiner is changed from Stefan Lundberg to Sonja Lundmark.
• One more tutorial
• Fewer lectures and fewer 4-hours lectures
• Changed tutor and lab assistant

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.

Studieportalen - Kursplan

 

 

 

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.