Change search
ReferencesLink to record
Permanent link

Direct link
Evaluation of Magnetic Leakage Field and the Need for Screening with Respect to Induction Power Transfer (IPT) System
Norwegian University of Science and Technology, Faculty of Information Technology, Mathematics and Electrical Engineering, Department of Electrical Power Engineering.
2014 (English)MasteroppgaveStudent thesis
Abstract [en]

This report considers a system for transferring electric power from shore to ships for charging of electrical driven ferries by use of induction power transfer (IPT). The IPT works by leading an alternating current through a coil stationed on shore which creates a time-varying magnetic field. This magnetic field will, through an air gap induce a voltage in another coil stationed on a ship, making it possible to transfer power wirelessly. This system will, as well as transferring power to the receiving coil also produce a time-varying magnetic field in the nearby surroundings which practically can be considered a leakage field, but can to some extent also be defined as electromagnetic radiation. In Norway, regulations regarding both ionizing and non-ionizing radiation are given by the Norwegian Radiation Protection Authority (NRPA). The IPT system operates in frequencies from 3 – 5 kHz and therefore the magnetic leakage field is considered as non-ionizing radiation. Requirements given by NRPA do not say anything specific about permitted levels of magnetic field strength because it varies with frequency, but says generally that it should be as low as practically possible and refer to reference levels given in guidelines published by the International Commission on Non-Ionizing Radiation Protection (ICNIRP). To obtain an overview of the radiation created by the IPT and how it complies with the reference levels, the system is modelled in COMSOL Multiphysics with one specific configuration of the coils and the current. The simulations have shown that the IPT will create time-varying magnetic fields that cause radiation above reference levels given in the ICNIRP guidelines; however the effect to the surroundings can be significantly reduced by use of screening such as aluminum plates in various configurations. The method used for modelling the IPT system has been verified by modelling an actual coil found in storage at SINTEF Energy research. This coil had been energized with a current of 10A and the magnetic flux density created by the energized coil has been measured and compared with COMSOL simulations.

Place, publisher, year, edition, pages
Institutt for elkraftteknikk , 2014. , 104 p.
URN: urn:nbn:no:ntnu:diva-26616Local ID: ntnudaim:10714OAI: diva2:749358
Available from: 2014-09-23 Created: 2014-09-23 Last updated: 2014-09-23Bibliographically approved

Open Access in DiVA

fulltext(7138 kB)519 downloads
File information
File name FULLTEXT01.pdfFile size 7138 kBChecksum SHA-512
Type fulltextMimetype application/pdf
cover(184 kB)2 downloads
File information
File name COVER01.pdfFile size 184 kBChecksum SHA-512
Type coverMimetype application/pdf

By organisation
Department of Electrical Power Engineering

Search outside of DiVA

GoogleGoogle Scholar
Total: 519 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Total: 44 hits
ReferencesLink to record
Permanent link

Direct link