Comparison of Spiral and Square Coil Configurations in Wireless Power Transfer System for Contactless Battery Charging

Mohammed Al-Saadi, Stanimir Valtchev, Luis Romba, José Gonçalves, Aurelian Crǎciunescu

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Citations (Scopus)

Abstract

In the inductive contactless battery charging, the power transfer capability and efficiency are mainly depending on the coupling coefficient (k) between the inductively coupled coils. In this work, the spiral and square coil configurations were experimentally made from litz wire as well as another spiral copper coil. This study investigates the frequency characteristics of these coil configurations in order to analyze the frequency characteristics of the self-inductance and equivalent series resistance of each coil; as well as we measured coefficient k under different conditions based on the air-gap variation between the inductively coupled coils and the misalignment between them. Furthermore, we examined the interoperability between the spiral and square coils configurations. It has been found that the litz spiral coil achieved slightly higher self-inductance with compare to litz square coil and spiral copper coil. Likewise, the square litz coil has slightly high equivalent series resistance with compare to other coils. On the other hand, the copper spiral coil has achieved better k than the other coupling interfaces of the litz wire coils.

Original languageEnglish
Title of host publication2019 Electric Vehicles International Conference, EV 2019
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)9781728107912
DOIs
Publication statusPublished - 1 Oct 2019
Event2019 Electric Vehicles International Conference, EV 2019 - Bucharest, Romania
Duration: 3 Oct 20194 Oct 2019

Conference

Conference2019 Electric Vehicles International Conference, EV 2019
CountryRomania
CityBucharest
Period3/10/194/10/19

Keywords

  • coil configurations
  • contactless battery charging
  • coupling coefficient
  • frequency characteristics
  • inductive power transfer
  • misalignment
  • wireless power transfer

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  • Cite this

    Al-Saadi, M., Valtchev, S., Romba, L., Gonçalves, J., & Crǎciunescu, A. (2019). Comparison of Spiral and Square Coil Configurations in Wireless Power Transfer System for Contactless Battery Charging. In 2019 Electric Vehicles International Conference, EV 2019 [8892897] Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/EV.2019.8892897