Oskar Wallmark
oskar.wallmark@ee.kth.se
Phone: +46 8 790 7831 (work)
Fax: +46 8 205 268
Electrical Energy Conversion (E2C)
School of Electrical Engineering
KTH Royal Institute of Technology
S-100 44 Stockholm
Sweden
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Personal
Date of birth:
Place of birth:
Citizenship:
Family:
August 3, 1976
Falun, Sweden
Swedish
Married with AnnSofie Hahne. Three children,
Arvid, born 2006, Tage, born 2007, and Signe, born
2009.
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Degrees
Ph. D. in Electric Power Engineering 2002-2006
Chalmers University of Technology, Göteborg, Sweden
Examiner: Prof. Tore Undeland
Lic. Eng. in Electric Power Engineering 2002-2004
Chalmers University of Technology, Göteborg, Sweden
Examiner: Prof. Tore Undeland
M. Sc. in Engineering Physics 1996-2001
Chalmers University of Technology, Göteborg, Sweden
Examiner: Assoc. Prof. Ola Carlson
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Current position
Since Dec. 2010, Associate Professor at the School of Electrical
Engineering, Electrical Energy Conversion (E2C), Royal Institute of
Technology, Stockholm, Sweden.
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Academic supervision Since September 2012, assistant supervisor for Ph.D.-student Hui
Zhang’s research project focusing on electric machine design for
integrated motors in automotive applications. The project is funded
by the KTH-CSC program.
Since September 2013, assistant supervisor for Ph.D.-student Mojgan
Nikouei Harnefors’ research project “High-efficient, ultra compact
integrated electric drives for tomorrow’s alternative drivetrains”
funded by the Swedish Hybrid Vehicle Center (SHC).
Since March 2014, assistant supervisor for Ph.D.-student Rudi Soares’
research project “Modellering och analys av samverkan mellan
batteri och spänningsomvandlare i elektriska drivlinor” funded by
the Swedish Energy Agency and Scania AB within the FFI research
program.
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Graduated students (postgraduate level)
Name
Kashif Khan
Date
14/12-11
Degree Role
Lic.
Assist. supervisor
Present employer
ABB
IEC LV Motors
Västerås
Sweden
Shafigh Nategh
13/6-13
Ph.D. Assist. supervisor
Smartmotors AS
Trondheim
Norway
Shuang Zhao
22/1-14
Ph.D. Assist. supervisor
ABB
Corporate Research
Västerås
Sweden
Andreas Krings
2/6-14
Ph.D. Assist. supervisor
ABB
Corporate Research
Västerås
Sweden
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Present teaching duty Course examiner in the course “EJ2222/FEJ3222 Design of Electrical
Machines” given for fourth year students at KTH Royal Institute of
Technology and Ph.D. students (inside and outside of KTH Royal
Institute of Technology).
Course examiner in the course “FEJ3230 Control of Voltage-Source
Converters for Grids and Drives” given for Ph.D. students (inside
and outside of KTH Royal Institute of Technology).
Course examiner in the courses “EJ210X Degree Project in Electrical
Machines and Drives” and “EJ211X Degree Project in Power
Electronics” given for fifth year students at KTH Royal Institute of
Technology.
Teacher in the course “EH1020 Elektroprojekt II” given for second
year students at KTH Royal Institute of Technology.
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Affiliations
Member of the Institute of Electrical and Electronics Engineers (IEEE)
and the IEEE Industrial Electronics Society (IES).
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Visits
Oct. - Dec. 2005. Research visit at University of Wisconsin-Madison,
in the group headed by Prof. Robert D. Lorenz.
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Publications
Published and accepted journal papers
1.
M. Nikouei Harnefors, O. Wallmark, L. Jin, L. Harnefors, and H.-P. Nee, “DClink stability analysis and controller design for the stacked polyphase bridges
converter,” accepted for publication in IEEE Transactions on Power Electronics.
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2.
G. Tolstoy, B. Larsson, O. Wallmark, S. Norrga, and H.-P. Nee, “Elimination of
vector changes due to sector changes with DTC,” accepted for publication in the
European Power Electronics and Drives (EPE) Journal.
3.
D. Wanner, O. Wallmark, M. Jonasson, L. Drugge, and A. Stensson Trigell,
"Control allocation strategies for an electric vehicle with a wheel hub motor
failure," International Journal of Vehicle Systems Modelling and Testing, vol. 10,
no. 3, pp 263-287, 2015.
4.
A. Krings, J. Soulard, and O. Wallmark, “PWM influence on the iron losses and
characteristics of a slot-less permanent magnet motor with SiFe and NiFe stator
cores,” IEEE Transactions on Industry Applications, vol. 51, no. 2, pp 1475-1484,
2015.
5.
S. Zhao, A. Lasson, O. Wallmark, and M. Leksell, “Off-Vehicle Evaluation of
Active Oscillation Damping Schemes,” IEEE Journal of Emerging and Selected
Topics in Power Electronics, vol. 2, no. 2, pp 264-271, 2014.
6.
S. Nategh, A. Krings, O. Wallmark, and M. Leksell, “Evaluation of impregnation
materials for thermal management of liquid-cooled electric machines,” IEEE
Transactions on Industrial Electronics, vol. 61, no. 11, pp. 5956-5965, 2014.
7.
S. Nategh, Z. Huang, O. Wallmark, M. Leksell, and A. Krings, “Thermal
modeling of directly cooled electric machines using lumped parameter and
limited CFD analysis,” IEEE Transactions on Energy Conversion, vol. 28, no. 4,
pp. 979-990, 2013.
8.
S. Zhao, O. Wallmark, M. Leksell, “Low-speed sensorless control with reduced
copper losses for saturated PMSynRel machines,” IEEE Transactions on Energy
Conversion, vol. 28, no. 4, pp. 841-848, 2013.
9.
A. Krings, S. Nategh, O. Wallmark, and J. Soulard, “Influence of the welding
process on the performance of slot-less PM motors with SiFe and NiFe stator
laminations,” IEEE Transactions on Industry Applications, vol. 50, no. 1, pp. 296306, 2014.
10. A. Krings, S. A. Mousavi, O. Wallmark, and J. Soulard, “Temperature influence of
NiFe steel laminations on the characteristics of small slot-less permanent magnet
machines,” IEEE Transactions on Magnetics, vol. 49, no. 7, pp. 4064-4067, 2013.
11. S. Nategh, O. Wallmark, M. Leksell, and S. Zhao, “Thermal analysis of a
PMaSRM using partial FEA and lumped parameter modeling,” IEEE
Transactions on Energy Conversion, vol. 27, no. 2, pp. 477-488, 2012.
12. O. Wallmark, J. Galic, and H. Mosskull, “Sensorless control of PMSMs adopting
indirect self control,” in IET Journal of Electric Power Applications, vol. 6, no. 1,
pp. 12-18, 2012.
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13. O. Wallmark, S. Lundberg, and M. Bongiorno, ”Inverter admittance expressions
for field-oriented controlled salient PMSM drives,” IEEE Transactions on Power
Electronics, vol. 27, no. 3, pp. 1514-1520, 2012.
14. O. Wallmark, P. Kjellqvist, and F. Meier, “Analysis of axial leakage in high-speed
slotless PM motors for industrial hand tools,” IEEE Transactions on Industry
Applications, vol. 45, no. 5, pp. 1815-1820, 2009.
15. O. Wallmark and P. Kjellqvist, “Analysis of a low-cost air-gap winding for
permanent-magnet synchronous motors,” IEEE Transactions on Energy
Conversion, vol. 24, no. 4, pp. 841-847, 2009.
16. M. Jonasson and O. Wallmark, “Control of electric vehicles with autonomous
corner modules: implementation aspects and fault handling,” International
Journal of Vehicle Systems Modelling and Testing, vol. 3, pp. 213-228, 2008.
17. M. Jonasson and O. Wallmark, “Stability of an electric vehicle with permanentmagnet in-wheel motors during electrical faults,” World Electric Vehicle
Association (WEVA) Journal, vol. 1, pp. 100-107, 2007.
18. O. Wallmark, L. Harnefors, and O. Carlson, “Control algorithms for a faulttolerant PMSM drive,” IEEE Transactions on Industrial Electronics, vol. 54, no. 4,
pp. 1973-1980, 2007.
19. O. Wallmark and L. Harnefors, “Sensorless control of salient PMSM drives in the
transition region,” IEEE Transactions on Industrial Electronics, vol. 53, no. 4, pp.
1179-1187, 2006.
20. M. Jansson, L. Harnefors, O. Wallmark, and M. Leksell, “Synchronization at
startup and stable rotation reversal of sensorless nonsalient PMSM drives,” IEEE
Transactions on Industrial Electronics, vol. 53, no. 2, pp. 379-387, 2006.
21. O. Wallmark, L. Harnefors, and O. Carlson, “An improved speed and position
estimator for salient permanent-magnet synchronous motors,” IEEE Transactions
on Industrial Electronics, vol. 52, no. 1, pp. 255-262, 2005.
Peer-reviewed conference papers
1.
M. Nikouei Harnefors, L. Jin, L. Harnefors, O. Wallmark, M. Leksell, and S.
Norrga, “Analysis of the dc-link stability for the stacked polyphase bridges
converter,” in Proc. 18th European Conference on Power Electronics and
Applications (EPE’15-ECCE), 2015.
2.
R. Soares, A. Bessman, O. Wallmark, M. Leksell, M. Behm, and P. Svens, “Design
aspects of an experimental setup for investigating current ripple effects in
Lithium-ion battery cells,” in Proc. 18th European Conference on Power
Electronics and Applications (EPE’15-ECCE), 2015.
3.
H. Zhang, O. Wallmark, and M. Leksell, “An iterative FEA-based approach for
the design of fault-tolerant IPM-FSCW machines,” in Proc. 18th European
Conference on Power Electronics and Applications (EPE’15-ECCE), 2015.
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4.
D. Wanner, M. Nybacka, O. Wallmark, and L. Drugge “Experimental
implementation of a fault handling strategy for electric vehicles with individualwheel drives,” in Proc. International Symposium on Dynamics of Vehicles on
Roads and Tracks (IAVSD’15), 2015.
5.
L. Jin, S. Norrga, H. Zhang, and O. Wallmark, “Evaluation of a multiphase drive
system in EV and HEV applications,” in Proc. IEEE International Electric
Machines and Drives Conference (IEMDC’15), 2015.
6.
S. Nategh, S. Øvrebø, S. Mahdavi, and O. Wallmark, “Thermal modelling of a
permanent magnet machine built using litz wire,” in Proc. International
Conference on Electrical Systems for Aircraft, Railway and Ship Propulsion
(ESARS’15), 2015.
7.
H. Zhang, O. Wallmark, and M. Leksell, “On fault tolerance for IPM-FSCW
machines adopting a modular converter,” in Proc. 17th International Conference
on Electrical Machines and Systems (ICEMS’14), 2014.
8.
L. Jin, S. Norrga, O. Wallmark, and M. Nikouei Harnefors, ”Control and
modulation of the stacked polyphase bridges inverter,” in Proc. 6th Annual IEEE
Energy Conversion Congress and Exposition (ECCE’14), 2014.
9.
H. Zhang, O. Wallmark, M. Leksell, S. Norrga, M. Nikouei Harnefors, and L. Jin,
“Machine design considerations for an MHF/SPB-converter based electric drive,”
in Proc. 40th Annual Conference of the IEEE Industrial Electronics Society
(IECON’14), 2014.
10. G. Tolstoy, B. Larsson, O. Wallmark, S. Norrga, and H.-P. Nee, “Elimination of
vector changes due to sector changes with DTC,” in Proc. 16th European
Conference on Power Electronics and Applications (EPE’14-ECCE), 2014.
11. O. Wallmark, M. Nybacka, D. Malmquist, M. Burman, P. Wennhage, and P.
Georén, “Design and implementation of an experimental research and concept
demonstration vehicle,” in Proc. 10th IEEE Vehicle Power and Propulsion
Conference (VPPC’14), 2014.
12. S. Norrga, L. Jin, O. Wallmark, A. Mayer, and K. Ilves, “A novel inverter
topology for compact EV and HEV drive systems,” in Proc. 39th Annual
Conference of the IEEE Industrial Electronics Society Conference (IECON’13),
2013.
13. S. Zhao, A. Lasson, O. Wallmark, and M. Leksell, “Off-vehicle evaluation of
active oscillation damping schemes,” in Proc. 5th Annual IEEE Energy Conversion
Congress and Exposition (ECCE’13), 2013.
14. A. Krings, S. Nategh, O. Wallmark, and J. Soulard, “Local iron loss identification
by thermal measurements on an outer rotor permanent magnet synchronous
machine,” in Proc. 15th International Conference on Electrical Machines and
Systems (ICEMS’12), 2012, CD-ROM.
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15. O. Wallmark, J. Galic, M. Jansson, and H. Mosskull, “A robust sensorless control
scheme for permanent-magnet motors in railway traction applications,” in Proc.
International Conference on Electrical Systems for Aircraft, Railway and Ship
Propulsion (ESARS’12), 2012, CD-ROM.
16. O. Wallmark and J. Galic, “Prediction of DC-link current harmonics from PMmotor drives in railway applications,” in Proc. International Conference on
Electrical Systems for Aircraft, Railway and Ship Propulsion (ESARS’12), 2012,
CD-ROM.
17. A. Krings, S. Nategh, A. Stening, H. Grop, O. Wallmark, and J. Soulard,
”Measurement and modelling of iron losses in electrical machines,” (invited
paper) in Proc. 5th International Conference on Magnetism and Metallurgy
(WMM’12), 2012, CD-ROM.
18. D. Wanner, J. Edrén, M. Jonasson, O. Wallmark, L. Drugge, and A. Stensson
Trigell, “Fault-tolerant control of electric vehicles with in-wheel motors through
tyre-force allocation,” in Proc 11th International Symposium on Advanced Vehicle
Control (AVEC’12), 2012, CD-ROM.
19. S. Zhao and O. Wallmark, “Torque dynamics in sensorless PMSM drives,” in
Proc. 20th International Conference on Electrical Machines (ICEM’12), 2012, CDROM.
20. A. Krings, S. Nategh, O. Wallmark, and J. Soulard, “Influence of the welding
processon the magnetic properties of a slot-less permanent magnet synchronous
machine stator core,” in Proc. 20th International Conference on Electrical
Machines (ICEM’12), 2012, CD-ROM.
21. S. Nategh, A. Krings, Z. Huang, O. Wallmark, M. Leksell, and M. Lindenmo,
“Evaluation of stator and rotor lamination materials for thermal management of a
PMaSRM,” in Proc. 20th International Conference on Electrical Machines
(ICEM’12), 2012, CD-ROM.
22. S. Nategh, O. Wallmark, and M. Leksell, “Thermal analysis of permanent-magnet
synchronous reluctance machines,” in Proc. 14th European Conference on Power
Electronics and Applications (EPE’11-ECCE), 2011, CD-ROM.
23. S. Zhao, S. Hagbin, O. Wallmark, M. Leksell, S. Lundmark, and O. Carlson,
“Transient modeling of an integrated charger for a plug-in hybrid electric
vehicle,” in Proc. 14th European Conference on Power Electronics and
Applications (EPE’11-ECCE), 2011, CD-ROM.
24. S. Zhao, O. Wallmark, and M. Leksell, “Analysis of a deeply saturated sensorless
PMSynRel drive for an automotive application,” in Proc. 14th European
Conference on Power Electronics and Applications (EPE’11-ECCE), 2011, CDROM.
25. S. Nategh, V. Lassila, Z. Huang, O. Wallmark, and M. Leksell, “Evaluation of
alternative stator and rotor lamination materials for thermal management of
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permanent magnet machines,” presented at the IEEE International Magnetics
Conference, 2011, CD-ROM.
26. K. Khan, S. Hagbin, M. Leksell, and O. Wallmark, “Design and performance
analysis of a permanent-magnet assisted synchronous reluctance machine for an
integrated charger application,” in Proc. 19th International Conference on
Electrical Machines, 2010, CD-ROM.
27. S. Hagbin, M. Alaküla, K. Khan, S. Lundmark, M. Leksell, O. Wallmark, and O.
Carlson, “Integrated chargers for EVs and PHEVs: Examples and new solutions,”
in Proc. 19th International Conference on Electrical Machines, 2010, CD-ROM.
28. S. Hagbin, K. Khan, S. Lundmark, M. Alaküla, O. Carlson, M. Leksell, and O.
Wallmark, “An integrated charger for plug-in hybrid electric vehicles based on a
special interior permanent magnet motor,” in Proc. IEEE Vehicle Power and
Propulsion Conference, 2010, CD-ROM.
29. K. Khan, M. Leksell, and O. Wallmark, “Design aspects on magnet placement in
permanent-magnet assisted synchronous reluctance machines,” in Proc. 5th IET
International Conference on Power Electronics, Machines and Drives, 2010, CDROM.
30. O. Wallmark, P. Kjellqvist, and F. Meier, “Analysis of axial leakage in high-speed
slotless PM motors for industrial hand tools,” in Proc. 43rd IEEE Industry
Applications Society Annual Meeting, 2008, CD-ROM.
31. M. Jonasson and O. Wallmark, “Stability of an electric vehicle with permanentmagnet in-wheel motors during electrical faults,” in Proc. 22nd International
Battery, Hybrid and Fuel Cell Electric Vehicle Symposium and Exposition
(EVS’22), 2006, pp. 1248-1259, CD-ROM.
32. O. Wallmark, L. Harnefors, and O. Carlson, “Control algorithms for a faulttolerant PMSM drive,” in Proc. 31st Annual Conference of the IEEE Industrial
Electronics Society (IEEE IECON’05), 2005, pp. 1467-1473, CD-ROM.
33. O. Wallmark, L. Harnefors, and O. Carlson, “Post-fault operation of fault-tolerant
inverters for PMSM drives,” in Proc. 11th European Conference on Power
Electronics and Applications (EPE’05), 2005, CD-ROM.
34. O. Wallmark, O. Carlson, and L. Harnefors, “Loss minimization of a PMSM drive
for a hybrid electric vehicle,” in Proc. 11th International Conference on Power
Electronics and Motion Control (EPE PEMC’04), vol. 6, 2004, pp. 160-164.
35. O. Wallmark, L. Harnefors, and O. Carlson, “Sensorless control of PMSM drives
for hybrid electric vehicles,” in Proc. 35th Annual IEEE Power Electronics
Specialists Conference (IEEE PESC’04), vol. 5, 2004, pp. 4017-4023.
36. O. Wallmark, “Modelling of permanent-magnet synchronous machines with nonsinusoidal flux linkage,” in Proc. IEEE Nordic Workshop on Power and
Industrial Electronics (IEEE NorPIE’02), 2002, CD-ROM.
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Non peer-reviewed publications
1.
O. Wallmark, “KTH Royal Institute of Technology – A JMAG partner university”
JMAG Newsletter, June, pp. 21-22, 2014.
Selected invited presentations
1.
O. Wallmark and M. Jonasson, “Vehicles with autonomous corner modules –
control and fault handling aspects,” Program Review Meeting – MIT Industry
Consortium on Advanced Automotive Electrical/Electronic Components and
Systems, 12-13 April, Seattle, U.S.A., 2007.
2. O. Wallmark, “Forskning och utveckling av elektriska maskiner och
kraftelektronik för el- och hybridfordon,” Elektronik i fordon, 23-24 April,
Göteborg, Sweden, 2013.
3. O. Wallmark, ”PMSynRel machines in EV and HEV applications,” Advanced
Technical Forum about Synchronous Reluctance Motor (SynRM) and its
Applications, 15th May, Chalmers University of Technology, Göteborg, Sweden,
2013.
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Theses
O. Wallmark, Control of Permanent-Magnet Synchronous Machines in Automotive
Applications, Ph. D. thesis, Chalmers University of Technology, Göteborg,
Sweden, 2006.
O. Wallmark, On Control of Permanent-Magnet Synchronous Motors in HybridElectric Vehicle Applications, Lic. thesis, Chalmers University of Technology,
Göteborg, Sweden, 2004.
O. Wallmark, Control of a Permanent Magnet Synchronous Motor with NonSinusoidal Flux Density Distribution, M. Sc. thesis, Chalmers University of
Technology, Göteborg, Sweden, 2001.
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