Accurate determination of null-point between overlapped planar spiral coils

Kyle John Williams; Graham Town; Sara Deilami; Steve Mitchell; Foad Taghizadeh

doi:10.1109/AUPEC62273.2024.10807629

Accurate determination of null-point between overlapped planar spiral coils

Kyle John Williams^*, Graham Town, Sara Deilami, Steve Mitchell, Foad Taghizadeh

^*Corresponding author for this work

School of Engineering

Research output: Chapter in Book/Report/Conference proceeding › Conference proceeding contribution › peer-review

Abstract

Within the context of multi-coil inductive power transfer (IPT) systems, the presence of mutual induction between same side coils has been a considerable challenge since it directly impacts system stability and performance. In this paper, a mathematical model is presented to accurately estimate the location of a null point in mutual inductance between two planar spiral circular coils. The impact of coil design parameters such as vertical separation, fill factor and outer radius are investigated for impact on null point location. This model is then verified against finite element analysis simulation results. The identified location of the null point is within a maximum of 0.39% error. The findings of this work are directly applicable to the design of multi-coil inductive power transfer systems where decoupling between same-side coils is advantageous to achieving high efficiency and power capability.

Original language	English
Title of host publication	2024 IEEE 34th Australasian Universities Power Engineering Conference (AUPEC)
Place of Publication	Piscataway, NJ
Publisher	Institute of Electrical and Electronics Engineers (IEEE)
Number of pages	5
ISBN (Electronic)	9798350377941
ISBN (Print)	9798350377958
DOIs	https://doi.org/10.1109/AUPEC62273.2024.10807629
Publication status	Published - 2024
Event	34th IEEE Australasian Universities Power Engineering Conference, AUPEC 2024 - Sydney, Australia Duration: 20 Nov 2024 → 22 Nov 2024

Publication series

Name
ISSN (Print)	2474-1493
ISSN (Electronic)	2474-1507

Conference

Conference	34th IEEE Australasian Universities Power Engineering Conference, AUPEC 2024
Country/Territory	Australia
City	Sydney
Period	20/11/24 → 22/11/24

Keywords

Wireless power transfer
inductive power transfer
mutual inductance estimation
null point estimation

Access to Document

10.1109/AUPEC62273.2024.10807629

Cite this

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title = "Accurate determination of null-point between overlapped planar spiral coils",

abstract = "Within the context of multi-coil inductive power transfer (IPT) systems, the presence of mutual induction between same side coils has been a considerable challenge since it directly impacts system stability and performance. In this paper, a mathematical model is presented to accurately estimate the location of a null point in mutual inductance between two planar spiral circular coils. The impact of coil design parameters such as vertical separation, fill factor and outer radius are investigated for impact on null point location. This model is then verified against finite element analysis simulation results. The identified location of the null point is within a maximum of 0.39% error. The findings of this work are directly applicable to the design of multi-coil inductive power transfer systems where decoupling between same-side coils is advantageous to achieving high efficiency and power capability.",

keywords = "Wireless power transfer, inductive power transfer, mutual inductance estimation, null point estimation",

author = "Williams, {Kyle John} and Graham Town and Sara Deilami and Steve Mitchell and Foad Taghizadeh",

year = "2024",

doi = "10.1109/AUPEC62273.2024.10807629",

language = "English",

isbn = "9798350377958",

publisher = "Institute of Electrical and Electronics Engineers (IEEE)",

booktitle = "2024 IEEE 34th Australasian Universities Power Engineering Conference (AUPEC)",

address = "United States",

note = "34th IEEE Australasian Universities Power Engineering Conference, AUPEC 2024 ; Conference date: 20-11-2024 Through 22-11-2024",

}

Williams, KJ, Town, G , Deilami, S, Mitchell, S & Taghizadeh, F 2024, Accurate determination of null-point between overlapped planar spiral coils. in 2024 IEEE 34th Australasian Universities Power Engineering Conference (AUPEC). Institute of Electrical and Electronics Engineers (IEEE), Piscataway, NJ, 34th IEEE Australasian Universities Power Engineering Conference, AUPEC 2024, Sydney, Australia, 20/11/24. https://doi.org/10.1109/AUPEC62273.2024.10807629

Accurate determination of null-point between overlapped planar spiral coils. / Williams, Kyle John; Town, Graham ; Deilami, Sara et al.
2024 IEEE 34th Australasian Universities Power Engineering Conference (AUPEC). Piscataway, NJ: Institute of Electrical and Electronics Engineers (IEEE), 2024.

Research output: Chapter in Book/Report/Conference proceeding › Conference proceeding contribution › peer-review

TY - GEN

T1 - Accurate determination of null-point between overlapped planar spiral coils

AU - Williams, Kyle John

AU - Town, Graham

AU - Deilami, Sara

AU - Mitchell, Steve

AU - Taghizadeh, Foad

PY - 2024

Y1 - 2024

N2 - Within the context of multi-coil inductive power transfer (IPT) systems, the presence of mutual induction between same side coils has been a considerable challenge since it directly impacts system stability and performance. In this paper, a mathematical model is presented to accurately estimate the location of a null point in mutual inductance between two planar spiral circular coils. The impact of coil design parameters such as vertical separation, fill factor and outer radius are investigated for impact on null point location. This model is then verified against finite element analysis simulation results. The identified location of the null point is within a maximum of 0.39% error. The findings of this work are directly applicable to the design of multi-coil inductive power transfer systems where decoupling between same-side coils is advantageous to achieving high efficiency and power capability.

AB - Within the context of multi-coil inductive power transfer (IPT) systems, the presence of mutual induction between same side coils has been a considerable challenge since it directly impacts system stability and performance. In this paper, a mathematical model is presented to accurately estimate the location of a null point in mutual inductance between two planar spiral circular coils. The impact of coil design parameters such as vertical separation, fill factor and outer radius are investigated for impact on null point location. This model is then verified against finite element analysis simulation results. The identified location of the null point is within a maximum of 0.39% error. The findings of this work are directly applicable to the design of multi-coil inductive power transfer systems where decoupling between same-side coils is advantageous to achieving high efficiency and power capability.

KW - Wireless power transfer

KW - inductive power transfer

KW - mutual inductance estimation

KW - null point estimation

UR - http://www.scopus.com/inward/record.url?scp=85215578419&partnerID=8YFLogxK

U2 - 10.1109/AUPEC62273.2024.10807629

DO - 10.1109/AUPEC62273.2024.10807629

M3 - Conference proceeding contribution

AN - SCOPUS:85215578419

SN - 9798350377958

BT - 2024 IEEE 34th Australasian Universities Power Engineering Conference (AUPEC)

PB - Institute of Electrical and Electronics Engineers (IEEE)

CY - Piscataway, NJ

T2 - 34th IEEE Australasian Universities Power Engineering Conference, AUPEC 2024

Y2 - 20 November 2024 through 22 November 2024

ER -

Accurate determination of null-point between overlapped planar spiral coils

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Keywords

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