A New Magnetic Structure of Unipolar Rectangular Coils in WPT Systems to Minimize the Ferrite Volume while Maintaining Maximum Coupling

Gautam Rituraj; Praveen Kumar

doi:10.1109/TCSII.2020.3044585

A New Magnetic Structure of Unipolar Rectangular Coils in WPT Systems to Minimize the Ferrite Volume while Maintaining Maximum Coupling

Gautam Rituraj
, Praveen Kumar

Research output: Contribution to journal › Article › peer-review

46 Scopus citations

Abstract

In the wireless power transfer system, the transmission efficiency and power transfer capability depend on the coupling coefficient ( k ). Usually, the coupling of the air-core unipolar coil system is weak. For improving k , the ferrite core is used. In traditional ferrite arrangement, the ferrite core size is kept approximately equal to the coil dimensions, which increases the overall weight and volume of the system. This brief proposes a novel and simple ferrite arrangement of unipolar rectangular coils, which maintains the maximum achievable k and minimizes the volume of ferrite used. Pythagoras' theorem is used to calculate the position and length of the ferrite bars. Furthermore, various possible ferrite arrangements are studied and compared with the proposed ferrite arrangement (PFA). The proposed arrangement saves 81.24% volume of the ferrite used with a decrement of only 6.93% in k (at the 150-mm air gap) over the traditional arrangement. Finally, a prototype of the PFA is developed, and the results are verified.

Original language	English
Article number	9295372
Pages (from-to)	2072-2076
Number of pages	5
Journal	IEEE Transactions on Circuits and Systems II: Express Briefs
Volume	68
Issue number	6
DOIs	https://doi.org/10.1109/TCSII.2020.3044585
State	Published - Jun 2021
Externally published	Yes

Funding

Manuscript received November 10, 2020; accepted December 9, 2020. Date of publication December 15, 2020; date of current version May 27, 2021. This work was supported by the Electric Mobility Laboratory, Department of EEE, IIT Guwahati, Guwahati, India. This brief was recommended by Associate Editor S. C. Wong. (Corresponding author: Gautam Rituraj.) The authors are with the Department of Electronics and Electrical Engineering, Electric Mobility Lab, Indian Institute of Technology Guwahati, Guwahati 781039, India (e-mail: [email protected]; praveen_kumar @iitg.ac.in).

Keywords

Coupling coefficient
ferrite core
misalignments
rectangular coil
square coil
wireless power transfer (WPT)

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10.1109/TCSII.2020.3044585

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abstract = "In the wireless power transfer system, the transmission efficiency and power transfer capability depend on the coupling coefficient ( k ). Usually, the coupling of the air-core unipolar coil system is weak. For improving k , the ferrite core is used. In traditional ferrite arrangement, the ferrite core size is kept approximately equal to the coil dimensions, which increases the overall weight and volume of the system. This brief proposes a novel and simple ferrite arrangement of unipolar rectangular coils, which maintains the maximum achievable k and minimizes the volume of ferrite used. Pythagoras' theorem is used to calculate the position and length of the ferrite bars. Furthermore, various possible ferrite arrangements are studied and compared with the proposed ferrite arrangement (PFA). The proposed arrangement saves 81.24\% volume of the ferrite used with a decrement of only 6.93\% in k (at the 150-mm air gap) over the traditional arrangement. Finally, a prototype of the PFA is developed, and the results are verified.",

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AB - In the wireless power transfer system, the transmission efficiency and power transfer capability depend on the coupling coefficient ( k ). Usually, the coupling of the air-core unipolar coil system is weak. For improving k , the ferrite core is used. In traditional ferrite arrangement, the ferrite core size is kept approximately equal to the coil dimensions, which increases the overall weight and volume of the system. This brief proposes a novel and simple ferrite arrangement of unipolar rectangular coils, which maintains the maximum achievable k and minimizes the volume of ferrite used. Pythagoras' theorem is used to calculate the position and length of the ferrite bars. Furthermore, various possible ferrite arrangements are studied and compared with the proposed ferrite arrangement (PFA). The proposed arrangement saves 81.24% volume of the ferrite used with a decrement of only 6.93% in k (at the 150-mm air gap) over the traditional arrangement. Finally, a prototype of the PFA is developed, and the results are verified.

KW - Coupling coefficient

KW - ferrite core

KW - misalignments

KW - rectangular coil

KW - square coil

KW - wireless power transfer (WPT)

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A New Magnetic Structure of Unipolar Rectangular Coils in WPT Systems to Minimize the Ferrite Volume while Maintaining Maximum Coupling

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