Performance comparison of two-, three- and four-coil e-textile wireless power transfer systems
Performance comparison of two-, three- and four-coil e-textile wireless power transfer systems
Magnetically coupled resonant wireless power transfer (MR-WPT) can efficiently power e-textile systems. Different coil configurations (2, 3 and 4-coil structures) were investigated using planar textile coils of size 14.5 x 15 cm fabricated on cotton substrates using an embroidery process whereby silk-coated copper Litz wire forms the conductive track. For each configuration, the efficiency of the MR-WPT has been explored at different separation distances, misalignments and when subject to bending. The results show that the 2-coil structure was the most efficient at short distances (below 10 cm). However, the 4-coil system has the best performance at distances over 11 cm and when subject to axial misalignment, variations in coil orientation and when the coils are deformed by bending. The planar 4-coil configuration is therefore recommended for use in most practical applications. The coils were wash tested, and whilst they continue to function up to 15 wash cycles, performance does deteriorate due to a change in the coil properties. The coils can withstand 1000 bending cycles but there is a drop in performance of 43% in power transfer efficiency due to increasing coil resistance. Performance over longer separation distances is limited due to the properties of textile coils.
Embroidered coil, Magnetic resonant coupling, Textile coil, Wearable coil, Wireless charging, Wireless power transfer (WPT)
Beeby, Stephen
ba565001-2812-4300-89f1-fe5a437ecb0d
Sun, Yixuan
f80611d9-8fef-457d-a42b-1454698a6cfc
Yong, Sheng
dfeeadf1-7268-4b52-b32d-74ca38a4dd20
Harris, Nick
237cfdbd-86e4-4025-869c-c85136f14dfd
Beeby, Stephen
ba565001-2812-4300-89f1-fe5a437ecb0d
Sun, Yixuan
f80611d9-8fef-457d-a42b-1454698a6cfc
Yong, Sheng
dfeeadf1-7268-4b52-b32d-74ca38a4dd20
Harris, Nick
237cfdbd-86e4-4025-869c-c85136f14dfd
Beeby, Stephen, Sun, Yixuan, Yong, Sheng and Harris, Nick
(2025)
Performance comparison of two-, three- and four-coil e-textile wireless power transfer systems.
IEEE Sensors Journal.
(In Press)
Abstract
Magnetically coupled resonant wireless power transfer (MR-WPT) can efficiently power e-textile systems. Different coil configurations (2, 3 and 4-coil structures) were investigated using planar textile coils of size 14.5 x 15 cm fabricated on cotton substrates using an embroidery process whereby silk-coated copper Litz wire forms the conductive track. For each configuration, the efficiency of the MR-WPT has been explored at different separation distances, misalignments and when subject to bending. The results show that the 2-coil structure was the most efficient at short distances (below 10 cm). However, the 4-coil system has the best performance at distances over 11 cm and when subject to axial misalignment, variations in coil orientation and when the coils are deformed by bending. The planar 4-coil configuration is therefore recommended for use in most practical applications. The coils were wash tested, and whilst they continue to function up to 15 wash cycles, performance does deteriorate due to a change in the coil properties. The coils can withstand 1000 bending cycles but there is a drop in performance of 43% in power transfer efficiency due to increasing coil resistance. Performance over longer separation distances is limited due to the properties of textile coils.
Text
Yixuan WPT paper_final
- Accepted Manuscript
More information
Accepted/In Press date: 12 December 2025
Keywords:
Embroidered coil, Magnetic resonant coupling, Textile coil, Wearable coil, Wireless charging, Wireless power transfer (WPT)
Identifiers
Local EPrints ID: 508417
URI: http://eprints.soton.ac.uk/id/eprint/508417
ISSN: 1530-437X
PURE UUID: 03b04bbc-8ba1-431c-83ef-880d49df023e
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Date deposited: 21 Jan 2026 17:31
Last modified: 22 Jan 2026 02:33
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Contributors
Author:
Stephen Beeby
Author:
Yixuan Sun
Author:
Sheng Yong
Author:
Nick Harris
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