Flexible Control of Magnetic Fields by Shaped-Optimized Three-Dimensional Coil Arrays

Abdolali, Ali; Jafari, Amir

doi:10.1109/lmag.2018.2880726

Cited by 4 publications

(3 citation statements)

References 24 publications

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“…According to market needs, more and more attention has been paid to the research of wireless power transmission in three-dimensional space based on non-directional and some research results have been obtained. The article [20] designed a deformable launch mechanism based on the directionality of the system, which can achieve a higher degree of freedom of the magnetic field, but this method has a certain degree of uncontrollability. In the article [21], a bowl-mounted launch mechanism is proposed, which can basically achieve "non-directional" within the charging range, but it does not indicate the specific anti-offset standard.…”

Section: Introductionmentioning

confidence: 99%

Directional Characteristics of Wireless Power Transfer via Coupled Magnetic Resonance

Liu

Yang

et al. 2020

Electronics

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The wireless power transfer (WPT) system via coupled magnetic resonance (CMR) is an efficient and practical power transmission technology that can realize medium- and long-distance power transmission. People’s requirements for the flexibility of charging equipment are becoming increasingly prominent. How to get rid of the “flitch plate type” wireless charging method and enhance the anti-offset performance is the main research direction. Directional characteristics of the system can affect the load receive power and system efficiency in practical applications. In this paper, the power and efficiency of the WPT system via CMR were analyzed according to the principle of near-field strong coupling at first. The expression of the mutual inductance between the transmitting and the receiving coils under angular offset was derived from the perspective of the mathematical model, and the influences of angular deviation were analyzed. Second, simulation models were established under different distance between coils, different coil types, and different coil radius ratios in symmetrical and asymmetrical systems. Afterwards, the directional law was obtained, providing reference for the optimal design of coupling coils. Finally, an experimental system was built, and directional characteristic experiments were carried out under different conditions. Experimental results were consistent with simulation results, which verified the theoretical analysis.

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Section: Introductionmentioning

confidence: 99%

Directional Characteristics of Wireless Power Transfer via Coupled Magnetic Resonance

Liu

Yang

et al. 2020

Electronics

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“…To this aim, the spatial forming of subwavelength magnetic fields is a potential solution and may enable the control of the produced magnetic field and the formation of a single-sided radiation pattern aimed only at the Rx coils and away from the lossy media [12,27,28,29]. A traditional method to focus the magnetic field and suppress its leakage has been introduced by Halbach [30], which has since been the basis of a multitude of biomedical treatments such as magnetic drug delivery [31,32,33].…”

Section: Introductionmentioning

confidence: 99%

Single-Sided Near-Field Wireless Power Transfer by A Three-Dimensional Coil Array

Hajiaghajani

Ahn

2019

Micromachines

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Wirelessly powered medical microrobots are often driven or localized by magnetic resonance imaging coils, whose signal-to-noise ratio is easily affected by the power transmitter coils that supply the microrobot. A controlled single-sided wireless power transmitter can enhance the imaging quality and suppress the radiation leakage. This paper presents a new form of electromagnet which automatically cancels the magnetic field to the back lobes by replacing the traditional circular coils with a three-dimensional (3D) coil scheme inspired by a generalized form of Halbach arrays. It is shown that, along with the miniaturization of the transmitter system, it allows for improved magnetic field intensity in the target side. Measurement of the produced magnetic patterns verifies that the power transfer to the back lobe is 15-fold smaller compared to the corresponding distance on the main lobe side, whilst maintaining a powering efficiency similar to that of conventional planar coils. To show the application of the proposed array, a wireless charging pad with an effective powering area of 144 cm2 is fabricated on 3D-assembled printed circuit boards. This 3D structure obviates the need for traditional magnetic shield materials that place limitations on the working frequency and suffer from non-linearity and hysteresis effects.

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“…In this Letter, an array of arbitrary shaped small loop antennas is introduced for controlling the near electric field. Recent advances in the technology of three-dimensional (3D) printers have made it possible to add the arbitrary complex shape of structures to electromagnetic problems as a new design parameter without the concern of fabrication [11]. As a result, with the help of this array contains 3D optimised elements, the desired distribution of the near electric field can be realised with high accuracy.…”

mentioning

confidence: 99%

Control of near electric field by topology optimised sub‐wavelength 3D loop antenna

Jafari

Abdolali

2019

Electronics Letters

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In this Letter, a new method is proposed for the synthesis of the near electric field. This method is based on three-dimensional (3D) small loop antennas with an engineered shape. An arbitrary shape is used as a new degree of freedom. Also, concerns over the implementation of complex shapes are vanished by 3D printing technology. With the help of an array of 3D small loop antennas, complex distribution of electric fields can be realised. To illustrate the functionality of the proposed method, an array of four elements, all of which is connected to a source, is designed to synthesise the desired electric field distribution. The results of design and experimental measurement showed high accuracy and capacity of this method in controlling the electric field.

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Flexible Control of Magnetic Fields by Shaped-Optimized Three-Dimensional Coil Arrays

Cited by 4 publications

References 24 publications

Directional Characteristics of Wireless Power Transfer via Coupled Magnetic Resonance

Directional Characteristics of Wireless Power Transfer via Coupled Magnetic Resonance

Single-Sided Near-Field Wireless Power Transfer by A Three-Dimensional Coil Array

Control of near electric field by topology optimised sub‐wavelength 3D loop antenna

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