Course syllabus
Course-PM
EEN135 EEN135 Electric machines for vehicles and vessels lp3 VT26 (7.5 hp)
Course is offered by the department of Electrical Engineering
Contact details
Examiner & Lecturer:
Sonja Lundmark sonja.lundmark@chalmers.se
Tutorial assistant:
Linhua Lai linhua@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
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 ideally 2 students (maximum 3 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
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 20/1 08-10 |
L1. Course introduction. Repetition of DC circuit theory. Starting with AC circuit theory, the jω-method. |
SL |
|
1 (4) Tue 20/1 10-12 |
L2. AC circuit theory. Representing AC values as phasors, Ohms law for AC and impedance of comp. |
SL |
|
1 (4) Wed 21/1 08-10 |
L3. AC circuit theory. Continue with the jω-method. Power in AC circuits (apparent, active and reactive). |
SL |
|
1 (4) Fri 23/1 08-10 |
L4. Y-connected 3-phase circuits, power in 3-phase AC circuits. Electric hazards and safety. |
SL |
|
1 (4) Fri 23/1 10-12 |
Tutorial 1. Practical lab 1: AC circuits. |
LL |
|
2 (5) Tue 27/1 10-12 |
L5. D-connected 3-phase circuits, YD-transformation, equivalent Y-phase circuit. Measuring AC values. |
SL |
|
2 (5) Wed 28/1 08-10 |
L6. Magnetic circuits, reluctance, coupled magnetic circuits, induced voltage, force. |
SL |
|
2 (5) Wed 28/1 13-17 |
Lab 1 AC, Group 1a EDIT building, room 3502 Grundkurslab |
BJ, LL |
|
2 (5) Thu 29/1 13-17 |
Lab 1 AC, Group 1b EDIT building, room 3502 Grundkurslab |
BJ, LL |
|
2 (5) Fri 30/1 08-10 |
L7. Rotating magnetic flux, the stator of 3-phase AC machines. Park and Clark transformation. |
SL |
|
2 (5) Fri 30/1 10-12 |
Tutorial 2. Magnetic circuit (linear and non-linear: inductor and single-phase |
LL |
|
3 (6) Mon 2/2 08-12 |
Lab 1 AC, Group 1c EDIT building, room 3502 Grundkurslab |
BJ, LL |
|
3 (6) Tue 3/2 08-10 |
L8. Induction machine. The parts of the machine, dynamic and steady-state model. |
SL |
|
3 (6) Tue 3/2 10-12 |
Tutorial 3. Practical lab 2: Induction machine |
LL |
|
3 (6) Wed 4/2 08-10 |
L9. Induction machine continued, Grid connected induction machine operation, losses and parameter determination.
|
SL |
|
3 (6) Fri 6/2 08-10 |
Dugga part A |
SL |
|
3 (6) Fri 6/2 10-12 |
Tutorial 4. Practical lab 2: Induction machine |
LL |
|
4 (7) Mon 9/2 08-12 |
Lab 2 IM, Group 2a EDIT building, room 3502 Grundkurslab |
BJ, QW |
|
4 (7) Tue 10/2 08-10 |
L10. Induction machine converter operated, |
SL |
|
4 (7) Tue 10/2 10-12 |
L11. Simulation model of the induction machine |
SL |
|
4 (7) Thurs 12/2 08-12 |
Lab 2 IM, Group 2b EDIT building, room 3502 Grundkurslab |
BJ, QW |
|
4 (7) Thurs 12/2 17-21 |
Lab 2 IM, Group 2c EDIT building, room 3502 Grundkurslab |
BJ, QW |
|
4 (7) Fri 13/2 10-12 |
L12. Cooling of electric motors, Scaling of electric motors, examples on IM |
SL |
|
5 (7) Mon 16/2 08-12 |
Lab 3 Simulation of IM, |
BJ, QW, LL |
|
5 (8) Tue 17/2 8-10 |
Lab 3 Simulation of IM, |
BJ, QW, LL |
|
5 (8) Tue 17/2 10-12 |
L13. Scaling of electric motors, examples on IM |
SL |
|
5 (8) Wed 18/2 8-10 |
Lab 3 Simulation of IM, |
BJ, QW, LL |
|
5 (8) Fri 20/2 8-10 |
Lab 3 Simulation of IM, |
BJ, QW, LL |
|
5 (8) Fri 20/2 10-12 |
Tutorial 5. Induction machine analysis (V/f control, traction application)
|
LL |
|
6 (9) Tue 24/2 08-10 |
L14. PMSM. The parts of the machine, dynamic model |
SL |
|
6 (9) Tue 24/2 10-12 |
L15. PMSM continued, dynamic and steady-state model. |
SL |
|
6 (9) Wed 25/2 08-10 |
L16. Simulation model of the PMSM, grid connected PMSM operation, losses. |
SL |
|
6 (9) Fri 27/2 08-10 |
Dugga part B |
SL |
|
6 (9) Fri 27/2 10-12 |
Tutorial 6. (PM) synchronous machines |
LL |
|
7 (10) Mon 2/3 08-12 |
Lab 4 Simulation of PMSM, |
BJ, QW, LL |
|
7 (10) Tue 3/3 10-12 |
Tutorial 7. (PM) synchronous machines |
LL |
|
7 (10) Wed 4/3 08-10 |
L17. Scaling of the PMSM, Reluctance machine, PM assisted reluctance machine. |
SL |
|
7 (10) Wed 4/3 10-12 and 13-17 |
Lab 4 Simulation of PMSM |
BJ, QW, LL |
|
7 (10) Thu 5/3 13-17 |
Lab 4 Simulation of PMSM, |
BJ, QW, LL |
|
7 (10) Fri 6/3 10-12 |
L18. PMSM converter operated, |
SL |
|
8 (11) Tue 10/3 8-10 |
Tutorial 8. Synchronous reluctance machines
|
LL |
|
8 (11) Tue 10/3 10-12 |
L19. Different types of stator windings (distributed, concentrated, hairpin.) |
SL |
|
8 (11) Wed 11/3 08-10 |
L20. Production methods, Recycling and environmental impact, magnetic materials. |
SL |
|
8 (11) Fri 13/3 10-12 |
Dugga part C |
SL |
|
Fri 20/3 08:00-12:00 |
Re-Dugga part A,B,C |
SL |
|
Tue 2/6 14:0 -18:00 |
Re-Dugga part A,B,C |
SL |
Changes made since the last occasion
- Fewer 4-hours lectures
Learning objectives and syllabus
Learning objectives:
- 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.
- Describe and model ideal components such as resistance, inductance, capacitance, alternating voltage sources and alternating current sources.
- Describe the material concepts including resistivity and temperature coefficient. Be able to use them in electrical calculations.
- Apply the fundamental laws that govern the quantities described in magnetic circuits: magnetomotive force, magnetic flux, reluctance, induced voltage and electromagnetic force.
- Apply Ohm's law, Kirchhoff's laws, power law and energy calculation to simple AC circuits.
- 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.
- 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.
- Explain the build-up (the parts of) and operation of synchronous and induction machines and model the machines both dynamically and stationary.
- 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.
Examination form
The course examination will involve three intermediate tests and one laboratory work:
- Part A, 2 credits: Basic simple electrical circuits and magnetic circuits.
- Assessment: Intermediate test (Dugga). Max. points on the test is 30 points.
- Part B, 2 credits: Induction machine.
- Assessment: Intermediate test (Dugga). Max. points on the test is 30 points.
- Part C, 2 credits: Synchronous machine.
- Assessment: Intermediate test (Dugga). Max. points on the test is 30 points.
- 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
The formula paper is attached to the duggas, you are not allowed to bring your own.
Only Chalmers Approved calculators are allowed at the exam, see the link
Permitted aids during examinations:
|
Chalmers-approved calculator |
Chalmers-approved calculators have a display that shows numbers, letters and mathematical signs and are not graphing. The following models are approved:
|
Course summary:
| Date | Details | Due |
|---|---|---|