miun.sePublications
Change search
Link to record
Permanent link

Direct link
BETA
Oelmann, Bengt
Publications (10 of 127) 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
Aranda, J. J., Bader, S. & Oelmann, B. (2019). A space-coiling resonator for improved energy harvesting in fluid power systems. Sensors and Actuators A-Physical, 291, 58-67
Open this publication in new window or tab >>A space-coiling resonator for improved energy harvesting in fluid power systems
2019 (English)In: Sensors and Actuators A-Physical, ISSN 0924-4247, E-ISSN 1873-3069, Vol. 291, p. 58-67Article in journal (Refereed) Published
Abstract [en]

Pressure fluctuation energy harvesting devices are promising alternatives to power up wireless sensors in fluid power systems. In past studies, classical Helmholtz resonators have been used to enhance the energy harvesting capabilities of these harvesters. Nevertheless, for fluctuations with frequency components in the range of less than 1000 Hz, the design of compact resonators is difficult, mostly for their poor acoustic gain. This paper introduces a space-coiling resonator fabricated using 3D printing techniques. The proposed resonator can achieve a better acoustic gain bounded by a small bulk volume compared to a classic Helmholtz resonator, improving the energy harvesting capabilities of pressure fluctuation energy harvesters. The resonator is designed and evaluated using finite-element-method techniques and examined experimentally. Three space-coiling-resonators are designed, manufactured and compared to classic Helmholtz resonators for three frequencies: 280 Hz, 480 Hz and 920 Hz. This work displays the possibility of compact, high-performance pressure fluctuation energy harvesters and the advantages of the space-coiling printed resonators to enhance the harvesting performance.

Place, publisher, year, edition, pages
Elsevier: Elsevier, 2019
Keywords
Energy harvesting, Acoustic pressure, Acoustic resonator, Sensors systems, Space-coiling resonator
National Category
Engineering and Technology
Identifiers
urn:nbn:se:miun:diva-36105 (URN)10.1016/j.sna.2019.01.022 (DOI)000468259200008 ()2-s2.0-85063744403 (Scopus ID)
Projects
SMART (Smarta system och tjänster för ett effektivt och innovativt samhälle)
Available from: 2019-05-08 Created: 2019-05-08 Last updated: 2019-09-09Bibliographically approved
Xu, Y., Bader, S. & Oelmann, B. (2019). Design, modeling and optimization of an m-shaped variable reluctance energy harvester for rotating applications. Energy Conversion and Management, 195, 1280-1294
Open this publication in new window or tab >>Design, modeling and optimization of an m-shaped variable reluctance energy harvester for rotating applications
2019 (English)In: Energy Conversion and Management, ISSN 0196-8904, E-ISSN 1879-2227, Vol. 195, p. 1280-1294Article in journal (Refereed) Published
Abstract [en]

The variable reluctance principle can be used to convert rotational kinetic energy into electrical energy, creating a Variable Reluctance Energy Harvester (VREH) based on electromagnetic induction. This can be used to implement self-sustaining wireless sensors in rotating applications. In this paper, we present and investigate a novel design of a VREH with high volumetric power density that targets low-speed rotating applications. The design uses an m-shaped pole-piece and two opposing magnets. We theoretically analyze key design parameters that influence the VREH’s output power, and relate these parameters to geometrical design factors of the proposed structure. Key design factors include the coil height, the permanent magnet height and the tooth height. A method based on numerical simulations is introduced, enabling to determine the optimal geometrical dimensions of the proposed structure under given size-constraints. The results demonstrate that the method leads to optimal structure configurations, which has been evaluated for different cases and is verified experimentally. Good agreement between numerical simulations and experiments are reported with deviations in output power estimation below 3%. The optimized m-shaped VREH, moreover, provides output power levels sufficient for wireless sensor operation, even in low-speed rotating applications.

Keywords
Energy harvesting, Rotational energy, Variable reluctance, Power density, Design method, Sensor systems
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:miun:diva-36250 (URN)10.1016/j.enconman.2019.05.082 (DOI)000482244300099 ()2-s2.0-85066501919 (Scopus ID)
Projects
SMART (Smarta system och tjänster för ett effektivt och innovativt samhälle)
Funder
Knowledge Foundation, ASIS 20140323Vinnova, 2017-03725
Available from: 2019-06-05 Created: 2019-06-05 Last updated: 2019-09-23Bibliographically approved
Xu, Y., Bader, S., Magno, M., Mayer, P. & Oelmann, B. (2019). Energy-autonomous On-rotor RPM Sensor Using Variable Reluctance Energy Harvesting. In: 2019 IEEE 8th International Workshop on Advances in Sensors and Interfaces (IWASI): . Paper presented at 2019 IEEE 8th International Workshop on Advances in Sensors and Interfaces (IWASI) (pp. 175-180). IEEE, Article ID 08791251.
Open this publication in new window or tab >>Energy-autonomous On-rotor RPM Sensor Using Variable Reluctance Energy Harvesting
Show others...
2019 (English)In: 2019 IEEE 8th International Workshop on Advances in Sensors and Interfaces (IWASI), IEEE, 2019, p. 175-180, article id 08791251Conference paper, Published paper (Refereed)
Abstract [en]

Energy-autonomous wireless sensor systems have the potential to enable condition monitoring without the need for a wired electrical infrastructure or capacity-limited batteries. In this paper, a robust and low-cost energy-autonomous wireless rotational speed sensor is presented, which harvests energy from the rotary motion of its host using the variable reluctance principle. A microelectromechanical system (MEMS) gyroscope is utilized for angular velocity measurements, and a Bluetooth Low Energy System-on-Chip (SoC) transmits the acquired samples wirelessly. An analysis on the individual subsystems is performed, investigating the output of the energy transducer, the required energy by the load, and energy losses in the whole system. The results of simulations and experimental measurements on a prototype implementation show that the system achieves energy-autonomous operation with sample rates between 1 to 50 Hz already at 10 to 40 rotations per minute. Detailed investigations of the system modules identify the power management having the largest potential for further improvements.

Place, publisher, year, edition, pages
IEEE, 2019
Keywords
Transducers, Energy harvesting, Wireless sensor networks, Sensor systems, Velocity control, Wireless communication, Wheels
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:miun:diva-36839 (URN)10.1109/IWASI.2019.8791251 (DOI)2-s2.0-85071415267 (Scopus ID)978-1-7281-0557-4 (ISBN)978-1-7281-0558-1 (ISBN)
Conference
2019 IEEE 8th International Workshop on Advances in Sensors and Interfaces (IWASI)
Projects
SMART (Smarta system och tjänster för ett effektivt och innovativt samhälle)
Funder
Knowledge Foundation, ASIS 20140323Vinnova, 2017-03725
Available from: 2019-08-13 Created: 2019-08-13 Last updated: 2019-09-24Bibliographically approved
Bader, S., Ma, X. & Oelmann, B. (2019). One-diode photovoltaic model parameters at indoor illumination levels – A comparison. Solar Energy, 180, 707-716
Open this publication in new window or tab >>One-diode photovoltaic model parameters at indoor illumination levels – A comparison
2019 (English)In: Solar Energy, ISSN 0038-092X, E-ISSN 1471-1257, Vol. 180, p. 707-716Article in journal (Refereed) Published
Abstract [en]

Models of photovoltaic devices are used to compare the properties of photovoltaic cells and panels, and to predict their I-V characteristics. To a large extent, modeling methods are based on the one-diode equivalent circuit. Although much research exists on the implementation and evaluation of these methods for typical outdoor conditions, their performance at indoor illumination levels is largely unknown. Consequently, this work performs a systematic study of methods for the parameter extraction of one-diode models under indoor conditions. We selected, reviewed and implemented commonly used methods, and compared their performance at different illumination levels. We have shown that most methods can achieve good accuracies with extracted parameters regardless of the illumination condition, but their accuracies vary significantly when the parameters are scaled to other conditions. We conclude that the physical interpretation of extracted parameters at low illumination is to a large extent questionable, which explains errors based on standard scaling approaches. 

Keywords
I-V characteristics, Indoor energy harvesting, Parameter extraction, Parameter scaling, Photovoltaic panel, PV model
Identifiers
urn:nbn:se:miun:diva-35823 (URN)10.1016/j.solener.2019.01.048 (DOI)000465060000061 ()2-s2.0-85060629587 (Scopus ID)
Projects
SMART (Smarta system och tjänster för ett effektivt och innovativt samhälle)
Available from: 2019-03-19 Created: 2019-03-19 Last updated: 2019-09-09Bibliographically approved
Krug, S., Bader, S., Oelmann, B. & O'Nils, M. (2019). Suitability of Communication Technologies for Harvester-Powered IoT-Nodes. In: IEEE International Workshop on Factory Communication Systems - Proceedings, WFCS: . Paper presented at 15th IEEE International Workshop on Factory Communication Systems, WFCS 2019, Sundsvall, 27 May-29 May 2019. Institute of Electrical and Electronics Engineers (IEEE), Article ID 8758042.
Open this publication in new window or tab >>Suitability of Communication Technologies for Harvester-Powered IoT-Nodes
2019 (English)In: IEEE International Workshop on Factory Communication Systems - Proceedings, WFCS, Institute of Electrical and Electronics Engineers (IEEE), 2019, article id 8758042Conference paper, Published paper (Refereed)
Abstract [en]

The Internet of Things introduces Internet connectivity to things and objects in the physical world and thus enables them to communicate with other nodes via the Internet directly. This enables new applications that for example allow seamless process monitoring and control in industrial environments. One core requirement is that the nodes involved in the network have a long system lifetime, despite limited access to the power grid and potentially difficult propagation conditions. Energy harvesting can provide the required energy for this long lifetime if the node is able to send the data based on the available energy budget. In this paper, we therefore analyze and evaluate which common IoT communication technologies are suitable for nodes powered by energy harvesters. The comparison includes three different constraints from different energy sources and harvesting technologies besides several communication technologies. Besides identifying possible technologies in general, we evaluate the impact of duty-cycling and different data sizes. The results in this paper give a road map for combining energy harvesting technology with IoT communication technology to design industrial sensor nodes. 

Place, publisher, year, edition, pages
Institute of Electrical and Electronics Engineers (IEEE), 2019
Keywords
Energy Harvesting, Industrial Applications, Internet of Things, Network Access Technologies
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:miun:diva-36903 (URN)10.1109/WFCS.2019.8758042 (DOI)000490866300029 ()2-s2.0-85070056989 (Scopus ID)9781728112688 (ISBN)
Conference
15th IEEE International Workshop on Factory Communication Systems, WFCS 2019, Sundsvall, 27 May-29 May 2019
Projects
SMART (Smarta system och tjänster för ett effektivt och innovativt samhälle)
Available from: 2019-08-20 Created: 2019-08-20 Last updated: 2019-11-14Bibliographically approved
Xu, Y., Bader, S. & Oelmann, B. (2018). A Survey on Variable Reluctance Energy Harvesters in Low-Speed Rotating Applications. IEEE Sensors Journal, 18(8), 3426-3435
Open this publication in new window or tab >>A Survey on Variable Reluctance Energy Harvesters in Low-Speed Rotating Applications
2018 (English)In: IEEE Sensors Journal, ISSN 1530-437X, E-ISSN 1558-1748, Vol. 18, no 8, p. 3426-3435Article in journal (Refereed) Published
Abstract [en]

Energy harvesting converts ambient energy to electrical energy that can be used to power, for example, sensors and sensor systems. Variable reluctance energy harvesting is a suitable candidate for the conversion of rotary kinetic motion, an energy form commonly found in industrial applications. The implementation of a variable reluctance energy harvester, however, has a significant effect on its performance and is not well studied. In this paper, we therefore conduct a survey on different structures of variable reluctance energy harvesters. Six existing structures, previously used in variable reluctance sensors, are presented and analyzed according to their approaches for magnetic flux change improvement. Together with a newly proposed structure, these structures are evaluated based on a finite element analysis, and their results are compared. It is demonstrated that the choice of structure considerably affects the power output of the harvester and is dependent on the improvement approaches the structure utilizes. The newly proposed structure outperforms all existing structures with respect to power output and power density, which comes at a cost of higher parasitic torque generation. A 53-fold power improvement over the reference and an 1.2-fold power improvement over the next best structure is observed. As a result, applications of variable reluctance energy harvesting become viable even at low angular velocities.

Keywords
Energy harvesting, sensor systems, finite element analysis, electromagnetic induction, magnetic flux
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:miun:diva-33263 (URN)10.1109/JSEN.2018.2808377 (DOI)000428585900039 ()2-s2.0-85042350692 (Scopus ID)
Projects
SMART (Smarta system och tjänster för ett effektivt och innovativt samhälle)
Available from: 2018-03-14 Created: 2018-03-14 Last updated: 2019-09-09Bibliographically approved
Aranda, J. J., Bader, S. & Oelmann, B. (2018). An Apparatus For The Performance Estimation Of Pressure Fluctuation Energy Harvesters. IEEE Transactions on Instrumentation and Measurement, 67(11), 2705-2713
Open this publication in new window or tab >>An Apparatus For The Performance Estimation Of Pressure Fluctuation Energy Harvesters
2018 (English)In: IEEE Transactions on Instrumentation and Measurement, ISSN 0018-9456, E-ISSN 1557-9662, Vol. 67, no 11, p. 2705-2713Article in journal (Refereed) Published
Abstract [en]

Hydraulic pressure fluctuation energy harvesters are promising alternatives to power up wireless sensor nodes in hydraulic systems. The characterization of these harvesters under dynamic and band-limited pressure signals is imperative for the research and development of novel concepts. To generate and control these signals in a hydraulic medium, a versatile apparatus capable of reproducing pressure signals is proposed. In this paper, a comprehensive discussion of the design considerations for this apparatus and its performance is given. The suggested setup enables the investigation of devices tailored for the harvesting of energy in conventional hydraulic systems. To mimic these systems, static pressures can be tuned up to 300 bar, and the pressure amplitudes with a maximum of 28 Bar at 40 Hz and 0.5 bar at 1000 Hz can be generated. In addition, pressure signals found in commercial hydraulic systems can be reproduced with good accuracy. This apparatus proves to be an accessible, robust, and versatile experimental setup to create environments for the complete performance estimation of pressure fluctuation energy harvesters. 

Place, publisher, year, edition, pages
IEEE, 2018
Keywords
Characterization, energy harvesting (EH), experimental setup, pressure fluctuations, wireless sensors.
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:miun:diva-34109 (URN)10.1109/TIM.2018.2828701 (DOI)000448720700017 ()2-s2.0-85046721477 (Scopus ID)
Projects
SMART (Smarta system och tjänster för ett effektivt och innovativt samhälle)
Available from: 2018-07-04 Created: 2018-07-04 Last updated: 2019-09-09Bibliographically approved
Rusu, C., Bader, S., Oelmann, B., Alvandpour, A., Enoksson, P., Braun, T., . . . Liljeholm, J. (2018). Challenges for Miniaturised Energy Harvesting Sensor Systems. In: 2018 10th International Conference on Advanced Infocomm Technology (ICAIT): . Paper presented at 2018 10th International Conference on Advanced Infocomm Technology (ICAIT), Stockholm, 12-15 August, 2018 (pp. 214-217).
Open this publication in new window or tab >>Challenges for Miniaturised Energy Harvesting Sensor Systems
Show others...
2018 (English)In: 2018 10th International Conference on Advanced Infocomm Technology (ICAIT), 2018, p. 214-217Conference paper, Published paper (Refereed)
Keywords
energy harvesting, telecommunication power management, wireless sensor networks, miniaturised energy harvesting sensor systems, alternative power source, miniaturisation, functional energy harvesting system, harvester device, energy storage, powering management circuits, low-power applications, energy harvester, ambient energy harvesting, future energy-efficient autonomous sensor systems, distributed sensing, wireless sensors network, Internet-of-Things, miniaturized kinetic-based harvesting systems, autonomous sensor systems, miniaturised energy harvesting, kinetic harvester, piezoelectric harvester, variable reluctance, supercapacitor, RPM sensor
Identifiers
urn:nbn:se:miun:diva-36658 (URN)10.1109/ICAIT.2018.8686695 (DOI)2-s2.0-85064729034 (Scopus ID)
Conference
2018 10th International Conference on Advanced Infocomm Technology (ICAIT), Stockholm, 12-15 August, 2018
Projects
SMART (Smarta system och tjänster för ett effektivt och innovativt samhälle)
Available from: 2019-07-08 Created: 2019-07-08 Last updated: 2019-09-09Bibliographically approved
Aranda, J. J., Bader, S. & Oelmann, B. (2018). Force Transmission Interfaces for Pressure Fluctuation Energy Harvesters. In: IECON 2018 - 44th Annual Conference of the IEEE Industrial Electronics Society: . Paper presented at IECON 2018 - 44th Annual Conference of the IEEE Industrial Electronics Society (pp. 4230-4235). IEEE, Article ID 8591058.
Open this publication in new window or tab >>Force Transmission Interfaces for Pressure Fluctuation Energy Harvesters
2018 (English)In: IECON 2018 - 44th Annual Conference of the IEEE Industrial Electronics Society, IEEE, 2018, p. 4230-4235, article id 8591058Conference paper, Published paper (Refereed)
Abstract [en]

Wireless sensor nodes in state of the art fluid power systems used in monitoring and maintenance prediction demand long lasting power sources that do not rely on batteries. Energy harvesting is a promising technology that can provide the required energy to power wireless sensors. Pressure fluctuation energy harvesters can be employed in conventional hydraulic systems to convert the acoustic pressure fluctuation to electrical power. Present studies have explored the overall efficiency of these devices while experimentally describing losses in piezoelectric and circuit interfaces, nevertheless there is no study on the fluid to mechanical force transmission efficiency. In this paper we investigate the pressure to force transmission rate of two types of fluid to mechanical interfaces: a flat metal plate and a conventional hydraulic piston. The interfaces are investigated in conditions similar to those found in conventional hydraulic systems. The study shows that flat plate exhibit good force transmission for low pressure applications with a constant rate across frequencies, while exhibiting a decrease in force transmission at higher pressures. On the other hand the piston exhibit a more robust pressure design, with a constant force transmission rate at all pressures but with a dampening of force at higher frequencies. It is shown that small differences in force transmission ratios can have a considerable impact on the power generation.

Place, publisher, year, edition, pages
IEEE, 2018
Series
IEEE Industrial Electronics Conference
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:miun:diva-35532 (URN)10.1109/IECON.2018.8591492 (DOI)2-s2.0-85061540327 (Scopus ID)978-1-5090-6684-1 (ISBN)
Conference
IECON 2018 - 44th Annual Conference of the IEEE Industrial Electronics Society
Projects
SMART (Smarta system och tjänster för ett effektivt och innovativt samhälle)
Available from: 2019-01-28 Created: 2019-01-28 Last updated: 2019-09-09Bibliographically approved
Organisations

Search in DiVA

Show all publications