Super-low-frequency wireless power transfer with lightweight coils for passing through a stainless steel plate

Ishida, Hideaki; Kyoden, Tomoaki; Furukawa, Hideyuki

doi:10.1063/1.5010855

Cited by 11 publications

(5 citation statements)

References 27 publications

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“…However, such systems often utilise metallic components that make induction difficult to achieve. Studies have shown that super-low-frequency induction can be utilised to reduce the dissipation effects of metal surfaces [130], increasing the use cases for this type of technology by expanding operating environments.…”

Section: Sources Of Energymentioning

confidence: 99%

Powering the Environmental Internet of Things

Curry

Harris

2019

Sensors

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The Internet of Things (IoT) is a constantly-evolving area of research and touches almost every aspect of life in the modern world. As technology moves forward, it is becoming increasingly important for these IoT devices for environmental sensing to become self-powered to enable long-term operation. This paper provides an outlook on the current state-of-the-art in terms of energy harvesting for these low-power devices. An analytical approach is taken, first defining types of environments in which energy-harvesters operate, before exploring both well-known and novel energy harvesting techniques and their uses in modern-day sensing.

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Section: Sources Of Energymentioning

confidence: 99%

Powering the Environmental Internet of Things

Curry

Harris

2019

Sensors

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“…However, existing works are mainly based on experiments and there is a lack of analytical model to provide more insightful understanding of the magnetic field propagation through metal walls. In these experiments, the carrier frequency varies from 50 Hz to several MHz and the coil profile are also very different [6], [14]. It is not clear what is the optimal configuration, i.e., carrier frequency, coil number of turns, coil size, and coil position.…”

Section: Introductionmentioning

confidence: 95%

Reliable Through-Metal Wireless Communication Using Magnetic Induction

Guo

Song

2019

IEEE Access

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Wireless sensors or robots in metal-constrained environments leverage through-metal wireless communications to send data and receive instructions. It is well-known that wireless radio frequency (RF) signals cannot penetrate through metal efficiently, which prevents us from applying existing wireless solutions. Moreover, most applications, e.g., metal inspection robots in an oil pipeline, require noncontact wireless communications, where the ultrasonic signals do not work. To this end, we propose to use magnetic induction communication to provide a reliable and flexible solution for wireless sensor and robotic networks in metal-constrained environments. We consider the transceivers are located on two different sides of a metal wall. Then, we develop an analytical model to obtain the optimal configurations of the magnetic coil and the carrier frequency to maximize the communication channel capacity. The received power and wireless channel bandwidth are studied. The results show that the optimal carrier frequency is around 1 kHz. In addition, we study the negative effects caused by coil misalignment and interference, which are circumvented by leveraging a coil array with optimal receiving strategy. The results are evaluated using numerical simulation and verified by finite element method-based simulation.INDEX TERMS Coil array, extreme environments, magnetic induction, optimal frequency, through-metal wireless communications.

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“…In a practical environment, there are probably some metal materials around the coils. The eddy current loss that will occur in these materials is proportional to the square of the frequency (7) . We think a low frequency range should be used to reduce heat generation in nearby metal materials.…”

Section: Introductionmentioning

confidence: 99%

Improving the Critical Transmission Distance of Inductively Coupled Wireless Power Transfer Having Parity-Time Symmetry

Ishida,

Akatsu,

Kyoden

et al. 2024

IEEJ Journal IA

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A wireless power transfer (WPT) system with parity-time symmetry has a critical magnetic coupling coefficient (kmc). A small kmc results in a highly robust, long-distance WPT. We found that the series-series/parallel topology is a good choice to obtain a small kmc. Additionally, a kmc value of 0.04 was achieved by a combination of a solenoid coil of 46 μH, low frequency range of 47-56 kHz, and buck converter. We investigated the optimal shape of the solenoid coil using an electromagnetic field simulator, and a critical transmission distance (dc) of 77 mm was achieved by small transmitter and receiver coils (dimensions: 100 mm × 20 mm × 10 mm). We succeeded in extending dc by 1.8 times over the results from our previous work. dc of 77 mm is 2.8 times as large as the cube root of the coil volume.

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Super-low-frequency wireless power transfer with lightweight coils for passing through a stainless steel plate

Cited by 11 publications

References 27 publications

Powering the Environmental Internet of Things

Powering the Environmental Internet of Things

Reliable Through-Metal Wireless Communication Using Magnetic Induction

Improving the Critical Transmission Distance of Inductively Coupled Wireless Power Transfer Having Parity-Time Symmetry

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