Modeling of Mutual Inductance for Hexagonal Coils with Horizontal Misalignment in Wireless Power Transfer

Tan, Pingan; Fu, Yi; Liu, Chunxia; Guo, Yuhan

doi:10.1109/ecce.2018.8558464

Cited by 19 publications

(7 citation statements)

References 17 publications

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“…Ref. [21], the component of the magnetic flux density along the z-axis generated by each side of the i-th TX coil can be derived equivalently from Eq. ( 6), which can be expressed as…”

Section: Fig 2 Equivalent Diagram Of Coilsmentioning

confidence: 99%

See 1 more Smart Citation

Optimal Design of Transmission Characteristics for Hexagonal Coil Wireless Power Transfer System Based on Genetic Algorithm

Tan

Song

Shangguan

et al. 2023

Chin. J. Electr. Eng.

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Effective optimization methods are used to guide the optimal design of coil parameters, which is significant for improving the transmission performance of the wireless power transfer (WPT) system. Traditional methods mostly rely on the exhaustive attack method and finite element analysis (FEA) to achieve the coil parameter design, which have the disadvantages of complex modeling and time-consumption. To overcome these limitations, this study proposes an optimization strategy based on the genetic algorithm (GA), which considers the actual requirements of the efficiency and power of the WPT system. First, a direct integration method is proposed to simplify the analytical solution process of the mutual inductance between the hexagonal coils.Based on the mutual inductance model, the transmission characteristics of the hexagonal coil WPT system are deeply analyzed by the control variable method. Most importantly, with the proposed optimization objective function and its constraints, the GA is used to automatically achieve multi-parameter optimization of the hexagonal coil. Finally, a 500 W WPT system experimental platform is established, and the experimental results verify the feasibility of the proposed optimization method.

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“…Ref. [21], the component of the magnetic flux density along the z-axis generated by each side of the i-th TX coil can be derived equivalently from Eq. ( 6), which can be expressed as…”

Section: Fig 2 Equivalent Diagram Of Coilsmentioning

confidence: 99%

“…x and k y are the coordinates of point W under the rotation coordinate axis [21] . The total magnetic flux density of the i-th TX coil at point W along the z-axis is defined as…”

Section: Fig 2 Equivalent Diagram Of Coilsmentioning

confidence: 99%

Optimal Design of Transmission Characteristics for Hexagonal Coil Wireless Power Transfer System Based on Genetic Algorithm

Tan

Song

Shangguan

et al. 2023

Chin. J. Electr. Eng.

View full text Add to dashboard Cite

show abstract

“…A 1 kW design with a flat spiral square coil design was proposed for mid-power EV charging [28]. Hexagonal coil was proposed to have a high coupling coefficient, more tolerance to misalignment and effective structure for multi-array coils such as honeycomb designs [29][30][31][32]. A circular coil structure is the most common, but it is particularly sensitive to misalignment.…”

Section: Coil Designmentioning

confidence: 99%

Inductive Power Transfer for Electric Vehicle Charging Applications: A Comprehensive Review

et al. 2022

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Nowadays, Wireless Power Transfer (WPT) technology is receiving more attention in the automotive sector, introducing a safe, flexible and promising alternative to the standard battery chargers. Considering these advantages, charging electric vehicle (EV) batteries using the WPT method can be an important alternative to plug-in charging systems. This paper focuses on the Inductive Power Transfer (IPT) method, which is based on the magnetic coupling of coils exchanging power from a stationary primary unit to a secondary system onboard the EV. A comprehensive review has been performed on the history of the evolution, working principles and phenomena, design considerations, control methods and health issues of IPT systems, especially those based on EV charging. In particular, the coil design, operating frequency selection, efficiency values and the preferred compensation topologies in the literature have been discussed. The published guidelines and reports that have studied the effects of WPT systems on human health are also given. In addition, suggested methods in the literature for protection from exposure are discussed. The control section gives the common charging control techniques and focuses on the constant current-constant voltage (CC-CV) approach, which is usually used for EV battery chargers.

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“…Inductance calculations of hexagonal coils require solution of complex integrals obtained by using the Biot Savart law. However, this process can be simplified by using some approximations such as dividing the inner area of the coil into rectangular and triangular pieces [25,34]. The total flux in the inner area of the coil can be obtained by summing these flux values.…”

Section: Proposed Coil Design and Inductance Calculation For Hexagonamentioning

confidence: 99%

“…A ferrite-less DD coil is proposed by using a reflection coil to decrease the total mess and cost [23]. Besides these novel coil designs, another coil structure is hexagonal coil which comes with some of advantages such as less sensitive to misalignment, more coupling coefficient than the same sized rectangular coil and easy and cost effective to implement multi array coils [24,25]. When the circular coil, which is the most /Turk J Elec Eng & Comp Sci used coil structure, is used in array coil systems, the number of coils that can be placed in a certain area is low.…”

Section: Introductionmentioning

confidence: 99%

A 1-kW wireless power transfer system for electric vehicle charging with hexagonal flat spiral coil

Aydin¹,

Aydemir²

2021

Turk J Elec Eng & Comp Sci

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Wireless Power Transfer (WPT) technology is getting more attention in these days as a clean, safe and easy alternative to charging batteries in several power levels. Different coil types and system structures have been proposed in the literature. Hexagonal coils which have a common usage for low power applications, have not been well studied for high and mid power applications such as in Electric Vehicle (EV) battery charging. In order to fill this knowledge gap, the self and mutual inductance equations of a hexagonal coil are obtained and these equations have been used to design a 1 kW WPT system with hexagonal coils for a mid-power stage EV charging. The theoretical and simulation results have been validated with an implementation in the laboratory and a DC-to-DC power efficiency of 85% is achieved across a 10 cm air gap between the perfect aligned coils. The misalignment performance of the system was observed for different positioning of the secondary coil and the output power variation is given. In addition, the effect of shielding on magnetic field exposition of a driver sitting in an EV was obtained and these simulation results were compared in order to check the compliance with international health standards.

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Modeling of Mutual Inductance for Hexagonal Coils with Horizontal Misalignment in Wireless Power Transfer

Cited by 19 publications

References 17 publications

Optimal Design of Transmission Characteristics for Hexagonal Coil Wireless Power Transfer System Based on Genetic Algorithm

Optimal Design of Transmission Characteristics for Hexagonal Coil Wireless Power Transfer System Based on Genetic Algorithm

Inductive Power Transfer for Electric Vehicle Charging Applications: A Comprehensive Review

A 1-kW wireless power transfer system for electric vehicle charging with hexagonal flat spiral coil

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