Comparative Analysis and Design of the Shielding Techniques in WPT Systems for Charging EVs

Tan, Lijing; Elnail, Kamal Eldin Idris; Ju, Minghao; Huang, Xueliang

doi:10.3390/en12112115

Cited by 18 publications

(11 citation statements)

References 32 publications

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“…Furthermore, the results of the simulations are not only useful for underlining the effect of the magnetic emissions of the motor on the innovative braking system but also for correlating the Helmholtz coil similitude to real electromagnetic emissions. The simulation strategy in the present paper is also verified by comparing the obtained direction and strength of the magnetic flux to those found in various FEA studies [41]. In this study, a time-and cost-effective solution is represented, enabling the simulation of how the motor interacts with a brake without the need for designing the entire motor.…”

Section: Discussionmentioning

confidence: 71%

Electromagnetic Interaction Model between an Electric Motor and a Magnetorheological Brake

Caushaj,

Imberti,

de Carvalho Pinheiro

et al. 2024

Designs

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This article focuses on modelling and validating a groundbreaking magnetorheological braking system. Addressing shortcomings in traditional automotive friction brake systems, including response delays, wear, and added mass from auxiliary components, the study employs a novel brake design combining mechanical and electrical elements for enhanced efficiency. Utilizing magnetorheological (MR) technology within a motor–brake system, the investigation explores the influence of external magnetic flux from the nearby motor on MR fluid movement, particularly under high-flux conditions. The evaluation of a high-magnetic-field mitigator is guided by simulated findings with the objective of resolving potential issues. An alternative method of resolving an interaction between an electric motor and a magnetorheological brake is presented. In addition, to test four configurations, multiple absorber materials are reviewed.

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Section: Discussionmentioning

confidence: 71%

Electromagnetic Interaction Model between an Electric Motor and a Magnetorheological Brake

Caushaj,

Imberti,

de Carvalho Pinheiro

et al. 2024

Designs

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“…The core structure presented herein can minimize the overall system volume and streamline the installation process compared with other shielding devices using WPT systems for charging EVs [83]. The primary reason for the differences among the core-based systems I-III is the distinct design of the core center.…”

Section: Discussionmentioning

confidence: 99%

Wireless Power Transfer Systems With Composite Cores for Magnetic Field Shielding With Electric Vehicles

Duan,

Lan,

Kodera

et al. 2023

IEEE Access

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The transmitting and receiving coils used in wireless power transfer (WPT) systems in electric vehicles (EVs) have a larger air gap (∼300 mm) and higher transmission power (kW) than those in typical WPT systems used in electrical appliances. However, this could weaken the magnetic field, reduce transfer efficiency, and lead to a public concern regarding potential adverse health effects related to electromagnetic field (EMF) exposure. Therefore, the assessment of compliance with product safety standards, based on international exposure guidelines such as the International Commission on Non-Ionizing Radiation Protection (ICNIRP), is crucial. This study uses the finite element method to analyze a commonly used core-less and core-based WPT system using a composite core material in EVs and scalar potential finite difference method for assessment of human protection. Based on the computational results, two core structures using different types of intermediate insert blocks were analyzed to reduce external magnetic fields and mitigate the human EMF exposure. The WPT system with a core structure improved the transfer efficiency by 34% for a 300 mm air gap over the core-less system. Moreover, this effectively reduced magnetic field leakage by 91.6% and induced electric field by 98.3%, resulting in the reduction of induced electric field in anatomical human body model. The results demonstrated that a WPT system with a composite core can simultaneously improve the transfer efficiency and protect humans from EMF exposure.

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“…It can be divided into three types: long-range (~m) [4], mid-range (~cm) [5], and short-range (~mm) [6]. MRC-WPT technology has been used in various locations and applications, such as household applications [7], electric vehicles [8,9], and implanted medical devices [10,11].…”

Section: Introductionmentioning

confidence: 99%

“…In [36,37], the coupling factor, which relates the peak in situ electric field to an applied non-uniform magnetic field, was calculated. Methods, such as compensation topology and passive shielding, to reduce the leakage magnetic field of WPT systems have also been proposed [9,38,39]. The studies mentioned above have mainly focused on the compliance assessment aspects of WPT systems but have not sufficiently investigated the effects of the presence of a human body on WPT performance.…”

Section: Introductionmentioning

confidence: 99%

Reduction in Human Interaction with Magnetic Resonant Coupling WPT Systems with Grounded Loop

et al. 2021

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Wireless power transfer (WPT) systems have attracted considerable attention in relation to providing a reliable and convenient power supply. Among the challenges in this area are maintaining the performance of the WPT system with the presence of a human body and minimizing the induced physical quantities in the human body. This study proposes a magnetic resonant coupling WPT (MRC-WPT) system that utilizes a resonator with a grounded loop to mitigate its interaction with a human body and achieve a high-efficiency power transfer at a short range. Our proposed system is based on a grounded loop to reduce the leakage of the electric field, resulting in less interaction with the human body. As a result, a transmission efficiency higher than 70% is achieved at a transmission distance of approximately 25 cm. Under the maximum-efficiency conditions of the WPT system, the use of a resonator with a grounded loop reduces the induced electric field, the peak spatial-average specific absorption rate (psSAR), and the whole-body averaged SAR by 43.6%, 69.7%, and 65.6%, respectively. The maximum permissible input power values for the proposed WPT systems are 40 and 33.5 kW, as prescribed in the International Commission of Non-Ionizing Radiation Protection (ICNIRP) guidelines to comply with the limits for local and whole-body average SAR.

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Comparative Analysis and Design of the Shielding Techniques in WPT Systems for Charging EVs

Cited by 18 publications

References 32 publications

Electromagnetic Interaction Model between an Electric Motor and a Magnetorheological Brake

Electromagnetic Interaction Model between an Electric Motor and a Magnetorheological Brake

Wireless Power Transfer Systems With Composite Cores for Magnetic Field Shielding With Electric Vehicles

Reduction in Human Interaction with Magnetic Resonant Coupling WPT Systems with Grounded Loop

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