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Haller, Stefan
Publications (10 of 11) Show all publications
Haller, S., Cheng, P. & Oelmann, B. (2019). A 2.5 v 600 a mosfet-based DC traction motor. In: Proceedings of the IEEE International Conference on Industrial Technology: . Paper presented at 2019 IEEE International Conference on Industrial Technology, ICIT 2019; Melbourne Convention and Exhibition Centre, Melbourne, Australia, 13 February 2019 through 15 February 2019 (pp. 213-218). Institute of Electrical and Electronics Engineers (IEEE), Article ID 8755146.
Open this publication in new window or tab >>A 2.5 v 600 a mosfet-based DC traction motor
2019 (English)In: Proceedings of the IEEE International Conference on Industrial Technology, Institute of Electrical and Electronics Engineers (IEEE), 2019, p. 213-218, article id 8755146Conference paper, Published paper (Refereed)
Abstract [en]

A high copper fill factor allows reducing the resistive losses responsible for more than 50 % of the losses in today's most commonly used electrical motors. Single-turn windings achieve a copper fill factor close to one. Furthermore, they do not suffer from turn to turn faults and provide a low thermal resistance between winding and stator. The reduced EMF of single-turn winding configurations promotes the use of extra-low voltage high current MOSFETs. Rapid development of these MOSFETs allows reversing common design principles to explore new applications, such as battery electric traction drives. This paper presents a 2.5 V 1 kW MOSFET driven 13-phase permanent magnet DC motor with a single-turn winding configuration. The motor prototype with a copper fill factor of 0.84 was tested with continuous drive currents up to 600 A. The measured torque-efficiency map shows that such a high-current concept with voltages below 60 V is feasible using today's extremely low-voltage high current semiconductors. Due to the rapid development of such switches, there is great potential in this concept for further improvements. This work presents a small-scale version of the high-current drive, which is part of the development of an extra-low voltage traction drive concept. 

Place, publisher, year, edition, pages
Institute of Electrical and Electronics Engineers (IEEE), 2019
Keywords
Brushless DC motor, High-current, Low-voltage, MOSFET, SELV, Single-turn winding, Traction drive
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:miun:diva-36837 (URN)10.1109/ICIT.2019.8755146 (DOI)2-s2.0-85069037482 (Scopus ID)9781538663769 (ISBN)
Conference
2019 IEEE International Conference on Industrial Technology, ICIT 2019; Melbourne Convention and Exhibition Centre, Melbourne, Australia, 13 February 2019 through 15 February 2019
Projects
SMART (Smarta system och tjänster för ett effektivt och innovativt samhälle)
Available from: 2019-08-13 Created: 2019-08-13 Last updated: 2019-09-19Bibliographically approved
Haller, S. (2019). MOSFET enabled low-voltage high-current DC traction drive: a pioneering concept for battery electric vehicles. (Licentiate dissertation). Sundsvall: Mid Sweden University
Open this publication in new window or tab >>MOSFET enabled low-voltage high-current DC traction drive: a pioneering concept for battery electric vehicles
2019 (English)Licentiate thesis, comprehensive summary (Other academic)
Place, publisher, year, edition, pages
Sundsvall: Mid Sweden University, 2019. p. 48
Series
Mid Sweden University licentiate thesis, ISSN 1652-8948 ; 153
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:miun:diva-36840 (URN)978-91-88527-90-5 (ISBN)
Presentation
2019-06-17, O102, Sundsvall, 14:00 (English)
Supervisors
Projects
SMART (Smarta system och tjänster för ett effektivt och innovativt samhälle)
Available from: 2019-08-13 Created: 2019-08-13 Last updated: 2019-09-09Bibliographically approved
Haller, S., Cheng, P. & Oelmann, B. (2016). Initial characterization of a 2V 1.1kW MOSFET commutated DC motor. In: IECON 2016 - 42nd Annual Conference of the IEEE Industrial Electronics Society: . Paper presented at 42nd Conference of the Industrial Electronics Society, IECON 2016; Palazzo dei CongressiFlorence; Italy; 24 October 2016 through 27 October 2016 (pp. 4287-4292). IEEE, Article ID 7794029.
Open this publication in new window or tab >>Initial characterization of a 2V 1.1kW MOSFET commutated DC motor
2016 (English)In: IECON 2016 - 42nd Annual Conference of the IEEE Industrial Electronics Society, IEEE, 2016, p. 4287-4292, article id 7794029Conference paper, Published paper (Refereed)
Abstract [en]

Rapid development of extremely-low voltage high current MOSFETs allows reversing common design principles to explore new applications, such as battery powered traction drives. This enables the usage of multi-phase single-turn stator windings which can achieve a copper fill factor close to one. This paper briefly describes the proposed 2V, 1.1kW MOSFET commutated 13-phase permanent magnet DC motor and presents the efficiency and resistive loss measurements of the first prototype. The motor was successfully run with drive currents up to 520 A. Most of the obtained losses were resistive contact losses due to the flexible winding connections, less than 6% are dedicated to the MOSFETs. The results show that such a high current drive system is feasible and has great potential for further improvements, which is supported by the rapid development of extremely-low voltage high current semiconductors.

Place, publisher, year, edition, pages
IEEE, 2016
Series
IEEE Industrial Electronics Society, ISSN 1553-572X
Keywords
Commutation, Current measurement, MOSFET, Stator windings, Torque, Torque measurement, brushless DC motor, drive system, electronic commutation, extremely-low voltage, single-turn coil
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:miun:diva-29845 (URN)10.1109/IECON.2016.7794029 (DOI)000399031204094 ()2-s2.0-85010042097 (Scopus ID)STC (Local ID)STC (Archive number)STC (OAI)
Conference
42nd Conference of the Industrial Electronics Society, IECON 2016; Palazzo dei CongressiFlorence; Italy; 24 October 2016 through 27 October 2016
Projects
SMART (Smarta system och tjänster för ett effektivt och innovativt samhälle)
Available from: 2017-01-10 Created: 2017-01-10 Last updated: 2019-09-09Bibliographically approved
Haller, S., Cheng, P. & Oelmann, B. (2016). Investigation of a 2 V 1.1 kW MOSFET commutated DC motor. In: Proceedings - 2016 IEEE International Power Electronics and Motion Control Conference (PEMC): . Paper presented at 17th IEEE International Power Electronics and Motion Control Conference, PEMC 2016; Festival and Congress CentreVarna; Bulgaria; 25 September 2016 through 28 September 2016 (pp. 586-593). IEEE, Article ID 7752061.
Open this publication in new window or tab >>Investigation of a 2 V 1.1 kW MOSFET commutated DC motor
2016 (English)In: Proceedings - 2016 IEEE International Power Electronics and Motion Control Conference (PEMC), IEEE, 2016, p. 586-593, article id 7752061Conference paper, Published paper (Refereed)
Abstract [en]

This paper proposes an extremely-low voltage high current MOSFET-based drive architecture. A single-turn multiphase winding design allows a copper fill factor approaching one. The single-turn coil design leads to a low EMF voltage and high current design which requires a matched drive system. To identify the technical design obstacles and verify the feasibility of the proposed architecture, a small scale prototype is built and successfully tested. The described prototype consists of an extremely-low voltage 13-phase single-turn coil permanent magnet DC motor and MOSFET-based commutator. The prototype's locked rotor-torque and no-load power consumption, as well as the EMF voltage measurements are presented and the DC motor constants are extracted. The experimental results from the prototype measurements indicate a promising potential for cost-effective extremely-low voltage high current MOSFET-based drive systems.

Place, publisher, year, edition, pages
IEEE, 2016
Keywords
DC motor drives, MOSFET, coils, commutator motors, copper, electric potential, machine windings, permanent magnet motors, power consumption, rotors, voltage measurement, EMF voltage measurements, MOSFET commutated DC motor, copper fill factor, extremely-low voltage 13-phase single-turn coil permanent magnet DC motor, extremely-low voltage high current MOSFET-based drive architecture, locked rotor-torque power consumption, matched drive system, no-load power consumption, power 1.1 kW, single-turn coil design, single-turn multiphase winding design, voltage 2 V, Commutation, DC motors, Induction motors, Windings, brushless DC motor, drive system, electronic commutation, extremely-low voltage, single-turn coil
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:miun:diva-29846 (URN)10.1109/EPEPEMC.2016.7752061 (DOI)000390590000087 ()2-s2.0-85008259872 (Scopus ID)STC (Local ID)978-1-5090-1798-0 (ISBN)STC (Archive number)STC (OAI)
Conference
17th IEEE International Power Electronics and Motion Control Conference, PEMC 2016; Festival and Congress CentreVarna; Bulgaria; 25 September 2016 through 28 September 2016
Projects
SMART (Smarta system och tjänster för ett effektivt och innovativt samhälle)
Available from: 2017-01-10 Created: 2017-01-10 Last updated: 2019-09-09Bibliographically approved
Haller, S., Cheng, P. & Oelmann, B. (2015). Air-gap flux density measurement system for verification of permanent magnet motor FEM model. In: IECON 2015 - 41st Annual Conference of the IEEE Industrial Electronics Society: . Paper presented at 41st Annual Conference of the IEEE Industrial Electronics Society, IECON 2015; Pacifico YokohamaYokohama; Japan; 9 November 2015 through 12 November 2015; Category numberCFP15IEC-ART; Code 119153 (pp. 445-450). Institute of Electrical and Electronics Engineers (IEEE), Article ID 7392140.
Open this publication in new window or tab >>Air-gap flux density measurement system for verification of permanent magnet motor FEM model
2015 (English)In: IECON 2015 - 41st Annual Conference of the IEEE Industrial Electronics Society, Institute of Electrical and Electronics Engineers (IEEE), 2015, p. 445-450, article id 7392140Conference paper, Published paper (Refereed)
Abstract [en]

To verify the FEM simulation of the air-gap flux density, it is necessary to measure the flux density distribution as function of the angular machine position. This paper presents a scalable 3-D direct air-gap flux density magnitude measurement system for rotating electrical machines. A combination of eight linear Hall effect flux sensors and a rotary encoder is used to measure the flux density magnitude as function of the angular machine position. The system is designed for permanent magnet motors with an air gap of at least 1 mm, but can also be used for other types of machines. The miniaturized sensor array with the flux sensors is 0.7 mm thick, and measures the distribution of the air-gap flux density magnitude in a range of ±2 T along the rotor axis. The design of the measurement system is described and tested on a prototype of an electronically commutated permanent magnet DC motor. The obtained measurement results are compared with the FEM simulation results of the prototype motor. A good match between the simulated and measured flux density magnitude is shown. The conclusions presented in this study, are used to further optimize the simulation model and the prototype motor.

Place, publisher, year, edition, pages
Institute of Electrical and Electronics Engineers (IEEE), 2015
Keywords
air-gap flux density measurement, FEM, LHEFS, linear Hall effect sensor, Permanent magnet machines, PM machines
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:miun:diva-28495 (URN)10.1109/IECON.2015.7392140 (DOI)000382950700089 ()2-s2.0-84973160983 (Scopus ID)9781479917624 (ISBN)
Conference
41st Annual Conference of the IEEE Industrial Electronics Society, IECON 2015; Pacifico YokohamaYokohama; Japan; 9 November 2015 through 12 November 2015; Category numberCFP15IEC-ART; Code 119153
Note

Conference Paper

Available from: 2016-07-22 Created: 2016-07-21 Last updated: 2019-08-13Bibliographically approved
Andersson, H., Manuilskiy, A., Haller, S., Hummelgård, M., Sidén, J., Hummelgård, C., . . . Nilsson, H.-E. (2014). Assembling surface mounted components on ink-jet printed double sided paper circuit board. Nanotechnology, 25, Art. no. 094002
Open this publication in new window or tab >>Assembling surface mounted components on ink-jet printed double sided paper circuit board
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2014 (English)In: Nanotechnology, ISSN 0957-4484, E-ISSN 1361-6528, Vol. 25, p. Art. no. 094002-Article in journal (Refereed) Published
Abstract [en]

Printed electronics is a rapidly developing field where many components can already be manufactured on flexible substrates by printing or by other high speed manufacturing methods. However, the functionality of even the most inexpensive microcontroller or other integrated circuit is, at the present time and for the foreseeable future, out of reach by means of fully printed components. Therefore, it is of interest to investigate hybrid printed electronics, where regular electrical components are mounted on flexible substrates to achieve high functionality at a low cost. Moreover, the use of paper as a substrate for printed electronics is of growing interest because it is an environmentally friendly and renewable material and is, additionally, the main material used for many packages in which electronics functionalities could be integrated. One of the challenges for such hybrid printed electronics is the mounting of the components and the interconnection between layers on flexible substrates with printed conductive tracks that should provide as low a resistance as possible while still being able to be used in a high speed manufacturing process. In this article, several conductive adhesives are evaluated as well as soldering for mounting surface mounted components on a paper circuit board with inkjet printed tracks and, in addition, a double sided Arduino compatible circuit board is manufactured and programmed.

Place, publisher, year, edition, pages
Institute of Physics (IOP), 2014
Keywords
printed electronics, component mounting, conductive adhesives, ink jet, printed circuit board, silver nano particle ink
National Category
Nano Technology
Identifiers
urn:nbn:se:miun:diva-21474 (URN)10.1088/0957-4484/25/9/094002 (DOI)000331573500004 ()2-s2.0-84894165167 (Scopus ID)STC (Local ID)STC (Archive number)STC (OAI)
Available from: 2014-02-28 Created: 2014-02-28 Last updated: 2017-12-05Bibliographically approved
Saleem, J., Majid, A., Haller, S. & Bertilsson, K. (2013). A study of IGBT rupture phenomenon in medium frequency resistance welding machine. In: Electrical Machines and Power Electronics and 2011 Electromotion Joint Conference (ACEMP), 2011 International Aegean Conference on: . Paper presented at Acemp - electromotion 2011, 8-10 September 2011 Istanbul - Turkey (pp. 236-239). IEEE conference proceedings
Open this publication in new window or tab >>A study of IGBT rupture phenomenon in medium frequency resistance welding machine
2013 (English)In: Electrical Machines and Power Electronics and 2011 Electromotion Joint Conference (ACEMP), 2011 International Aegean Conference on, IEEE conference proceedings, 2013, p. 236-239Conference paper, Published paper (Refereed)
Abstract [en]

Inverter drive resistance spot welding machines are becoming a good choice of welding because of the increased machine efficiency and output power. The DC link capacitors in spot welding equipment store a large amount of energy. In case of any failure, the IGBT in the inverter has a risk of exhibiting a violent rupture. This rupture can damage the converter, drive down time and personal injury which may lead to the machinery certification problems. IGBT failure detection and solution for protection of these failures in resistance welding machines have not been reported in literature. Literature study of the IGBT failure, rupture, fault detection and protection has been carried out for inverter drives in power applications. On the basis of the findings some protection schemes and important measures in the design of the machine have been adopted which have resulted in the reduced risk of IGBT failure.

Place, publisher, year, edition, pages
IEEE conference proceedings, 2013
Keywords
Resistance welding; IGBT rupture; Inverter drive; Medium frequency spot welding machines
National Category
Engineering and Technology
Identifiers
urn:nbn:se:miun:diva-14565 (URN)10.1109/ACEMP.2011.6490602 (DOI)2-s2.0-84876460443 (Scopus ID)STC (Local ID)978-1-4673-5002-0 (ISBN)STC (Archive number)STC (OAI)
Conference
Acemp - electromotion 2011, 8-10 September 2011 Istanbul - Turkey
Available from: 2011-10-04 Created: 2011-10-04 Last updated: 2017-11-02Bibliographically approved
Majid, A., Saleem, J., Kotte, H. B., Ambatipudi, R., Haller, S. & Bertilsson, K. (2013). Analysis of feedback in converter using coreless printed circuit board transformer. In: Electrical Machines and Power Electronics and 2011 Electromotion Joint Conference (ACEMP), 2011 International Aegean Conference on: . Paper presented at International Aegean Conference on Electric Machines and Power Electronics & Electromotion Joint Conference 08-10 September 2011 İstanbul, Turkey (pp. 601-604). IEEE conference proceedings
Open this publication in new window or tab >>Analysis of feedback in converter using coreless printed circuit board transformer
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2013 (English)In: Electrical Machines and Power Electronics and 2011 Electromotion Joint Conference (ACEMP), 2011 International Aegean Conference on, IEEE conference proceedings, 2013, p. 601-604Conference paper, Published paper (Refereed)
Abstract [en]

Power supply is an inevitable component for all electronic instruments as a constant DC source. Almost all power supplies use feedback loop to achieve constant DC output voltage. In a feedback loop, the galvanic isolation is required between input and output. It can be achieved either by implementation of opto-coupler feedback on the secondary side or magnetic feedback. In this paper both opto-coupler and auxiliary feed-back techniques are implemented and analyzed in a high frequency half bridge converter using coreless Printed Circuit Board (PCB) power transformer. The implementation of opto-coupler feedback is temperature sensitive and has relatively high cost. The auxiliary winding of transformer can also be used to provide feedback signals as alternate to opto-coupler. Auxiliary feedback implementation is cheaper, temperature stable and insensitive to temperature variations. In this paper, the feasibility of feedback using auxiliary winding of coreless PCB power transformer is investigated. It is observed that this technique can be used as an alternative to opto-coupler feedback.

Place, publisher, year, edition, pages
IEEE conference proceedings, 2013
Keywords
Analog to digital conversion; Electro-magnetic interference; Switch mode power supplies; Printed circuit board; Pulse width modulation
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:miun:diva-14523 (URN)10.1109/ACEMP.2011.6490667 (DOI)2-s2.0-84876496931 (Scopus ID)STC (Local ID)978-1-4673-5002-0 (ISBN)STC (Archive number)STC (OAI)
Conference
International Aegean Conference on Electric Machines and Power Electronics & Electromotion Joint Conference 08-10 September 2011 İstanbul, Turkey
Available from: 2011-09-21 Created: 2011-09-22 Last updated: 2017-11-02Bibliographically approved
Kotte, H. B., Ambatipudi, R., Haller, S. & Bertilsson, K. (2012). A ZVS Half Bridge DC-DC Converter in MHz Frequency Region using Novel Hybrid Power Transformer. In: Proceedings of International Exhibition and Conference for Power Electronics, Intelligent Motion, Power Quality (PCIM) 2012, 8-10 May 2012, Nuremberg, Germany.: . Paper presented at International Conference on Power Conversion and Intelligent Motion (PCIM) 2012, Nuremberg, Germany (pp. 399-406). Berlin: Curran Associates, Inc.
Open this publication in new window or tab >>A ZVS Half Bridge DC-DC Converter in MHz Frequency Region using Novel Hybrid Power Transformer
2012 (English)In: Proceedings of International Exhibition and Conference for Power Electronics, Intelligent Motion, Power Quality (PCIM) 2012, 8-10 May 2012, Nuremberg, Germany., Berlin: Curran Associates, Inc., 2012, p. 399-406Conference paper, Published paper (Refereed)
Abstract [en]

The significant problems in increasing the switching frequency of isolated converters to achieve low cost and high power density are increased magnetic and switching losses. This paper presents solution with the investigation of newly designed high frequency, low profile, hybrid power transformer together with commercially available GaN MOSFETs. For achieving stringent power converters, a center tapped 4:1:1 half bridge transformer was designed in a multilayered PCB laminate with a total height of transformer as 4.2mm. The maximum obtained energy efficiency of transformer is 98% in the frequency region of 1 – 5MHz. The designed transformer possesses better high frequency characteristics in the frequency range of 3 - 5MHz with tested power density of 47W/cm3 at an operating frequency of 3MHz. This transformer has been utilized in the multi resonant zero voltage switching (ZVS) half bridge converter with synchronous rectification using GaN MOSFETs and then evaluated. The maximum achieved efficiency of multi resonant ZVS half bridge converter with this transformer is 92% in 3 – 4.5 MHz switching frequency range with characterized output power of 40W. This is to the author’s knowledge, the best energy efficiency ever reported for an isolated DC-DC converter in this frequency range and power levels. At a specified input voltage, the converter has been regulated to 15V within 1% for both line and wide load variations. This work provides considerable step for the development of next generation ultra flat low profile isolated DC-DC/AC-DC converters operating in MHz frequency region.

Place, publisher, year, edition, pages
Berlin: Curran Associates, Inc., 2012
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:miun:diva-15268 (URN)2-s2.0-84867880610 (Scopus ID)STC (Local ID)978-3-8007-3431-3 (ISBN)STC (Archive number)STC (OAI)
Conference
International Conference on Power Conversion and Intelligent Motion (PCIM) 2012, Nuremberg, Germany
Available from: 2011-12-14 Created: 2011-12-14 Last updated: 2016-10-20Bibliographically approved
Majid, A., Kotte, H. B., Saleem, J., Ambatipudi, R., Haller, S. & Bertilsson, K. (2011). High Frequency Half-Bridge Converter using Multilayered Coreless PrintedCircuit Board Step-Down Power Transformer. In: 8th International Conference on Power Electronics - ECCE Asia: "Green World with Power Electronics", ICPE 2011-ECCE Asia: . Paper presented at 8th International Conference on Power Electronics - ECCE Asia May 30-June 3, 2011, The Shilla Jeju, Korea (pp. 1177-1181). IEEE conference proceedings
Open this publication in new window or tab >>High Frequency Half-Bridge Converter using Multilayered Coreless PrintedCircuit Board Step-Down Power Transformer
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2011 (English)In: 8th International Conference on Power Electronics - ECCE Asia: "Green World with Power Electronics", ICPE 2011-ECCE Asia, IEEE conference proceedings, 2011, p. 1177-1181Conference paper, Published paper (Refereed)
Abstract [en]

This paper introduces high frequencyhalf bridgeDC-DC converter, using multilayered coreless Printed Circuit Board (PCB) step down power transformer. The converter is simulated and then implemented on a PCB. Complementary Pulse Width Modulated (PWM) signals are generated to turn on high and low side Metal Oxide Semiconductor Field Effect Transistors (MOSFETs) alternately by a micro-controller. The isolated gate drive signals are provided to the high side MOSFET by using high frequency coreless PCB isolation transformer. We tested the converter for switching frequency range of 2 to 3 MHz, and for maximum input voltage up-to 170 V. The maximum output power achieved is 40 W and the maximum energy efficiency is approximately 82 %. © 2011 IEEE.

Place, publisher, year, edition, pages
IEEE conference proceedings, 2011
Keywords
Printed Circuit Board; Pulse Width Modulation; Switch Mode Power Supplies
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:miun:diva-14197 (URN)10.1109/ICPE.2011.5944712 (DOI)2-s2.0-80052080114 (Scopus ID)STC (Local ID)978-1-61284-956-0 (ISBN)978-1-61284-958-4 (ISBN)STC (Archive number)STC (OAI)
Conference
8th International Conference on Power Electronics - ECCE Asia May 30-June 3, 2011, The Shilla Jeju, Korea
Available from: 2011-07-19 Created: 2011-07-19 Last updated: 2016-10-19Bibliographically approved
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