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Applied Sciences
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Magnetically Coupled Wireless Power Transfer System
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Magnetically Coupled Wireless Power Transfer System

A special issue of Applied Sciences (ISSN 2076-3417). This special issue belongs to the section "Electrical, Electronics and Communications Engineering".

Deadline for manuscript submissions: closed (10 July 2022) | Viewed by 7684

Special Issue Editor

Prof. Dr. Panbo Liu

E-Mail Website
Guest Editor
School of Chemistry and Chemical Engineering, Northwestern Polytechnical University, Xi’an, China
Interests: carbon composites; porous structure; dielectric properties; magnetic particles; microwave absorption
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Currently, wireless power transfer (WPT), due to the advantages of contactless connection between power source and load, has been extensively studied in various utilizations, such as charging for electric vehicles, medical implants system and underwater wireless power transfer. However, the efficiency and reliability of WPT can be greatly affected by the external environment, which restricts the wide use of the technology. Especially when the system is close to lossy medium, the efficiency of power transmission will be a complex function of dielectric conductivity, dielectric constant and system parameters. With the aim to solve the above problem, many researches focus on analysis of propagation characteristics of electromagnetic wave in lossy medium, designing a novel system topology, studying electromagnetic metamaterials and intelligent control methods.

This Special Issue will attempt to cover the recent advances in analysis and rational design of magnetically coupled wireless power transfer systems, concerning the design and use of new materials, the analysis of electromagnetic wave propagation characteristics in lossy medium, the design of power transmission topology and methods to improve the efficiency and reliability of the system.

You may choose our Joint Special Issue in Magnetochemistry.

Prof. Dr. Panbo Liu
Guest Editor

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Keywords

  • wireless power transfer
  • magnetic coupling
  • electromagnetic field
  • lossy medium
  • electromagnetic metamaterials

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Published Papers (3 papers)

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Research

20 pages, 7479 KiB  
Article
A Method to Reduce Eddy Current Loss of Underwater Wireless Power Transmission by Current Control
by Jiale Wang, Baowei Song and Yushan Wang
Appl. Sci. 2022, 12(5), 2435; https://doi.org/10.3390/app12052435 - 25 Feb 2022
Cited by 4 | Viewed by 2207
Abstract
In recent years, wireless power transmission (WPT) technology based on magnetic resonance has been extensively studied. However, in contrast to that in the air, wireless power transmission in seawater medium will be accompanied by inevitable energy loss, that is, eddy current loss (ECL), [...] Read more.
In recent years, wireless power transmission (WPT) technology based on magnetic resonance has been extensively studied. However, in contrast to that in the air, wireless power transmission in seawater medium will be accompanied by inevitable energy loss, that is, eddy current loss (ECL), which will increase with the frequency and coil current. In this article, an equivalent circuit model of the eddy current loss of underwater wireless power transmission is established, two methods to reduce the eddy current loss are proposed, and the optimal modulus ratio for the coil current of the dual-coil wireless power transmission system to reduce eddy current loss is calculated. Electromagnetic field (EMF) simulation software verifies the correctness of the two methods, and it is concluded that increasing the phase difference of the coil current or controlling the coil current ratio to ensure that the optimal modulus ratio is in a certain range can reduce the eddy current loss effectively and improve the energy transmission efficiency of the system by about 4~5%. Full article
(This article belongs to the Special Issue Magnetically Coupled Wireless Power Transfer System)
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15 pages, 3848 KiB  
Article
Optimization Design of Planar Circle Coil for Limited-Size Wireless Power Transfer System
by Yayu Ma, Zhaoyong Mao and Kehan Zhang
Appl. Sci. 2022, 12(5), 2286; https://doi.org/10.3390/app12052286 - 22 Feb 2022
Cited by 5 | Viewed by 2431
Abstract
Power Transfer Efficiency (PTE) and Transferred Power (TP) are two crucial indicators of the wireless power transfer (WPT) system. However, in most compensatory topologies, the ideal coils design parameters of PTE and TP are inconsistent, implying that optimizing for one indicator would make [...] Read more.
Power Transfer Efficiency (PTE) and Transferred Power (TP) are two crucial indicators of the wireless power transfer (WPT) system. However, in most compensatory topologies, the ideal coils design parameters of PTE and TP are inconsistent, implying that optimizing for one indicator would make another indicator less effective. As a result, in this article, the Thompson sampling efficient multi-objective optimization (TSEMO) algorithm is used to simultaneously optimize PTE and TP in the S-S compensation topology. Through the co-calculation of MATLAB and COMSOL, the coils can be optimized in the environment of magnetic material (ferrite) and conductive material (aluminum). Coils larger than the underwater vehicle’s size are deleted during the data interaction between MATLAB and COMSOL to guarantee that the optimal PTE and TP can be attained within the constrained area. Due to the open standard external software packages between MATLAB and COMSOL, the entire optimization process may be automated. The results show that for WPT systems with restricted input voltage, such as the battery, this design strategy can achieve better TP at the expense of lower PTE, which is highly beneficial in improving the system’s overall performance. Full article
(This article belongs to the Special Issue Magnetically Coupled Wireless Power Transfer System)
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17 pages, 5550 KiB  
Article
Analysis and Optimal Design of a WPT Coupler for Underwater Vehicles Using Non-Dominated Sorting Genetic Algorithm
by Bo Liang, Zhaoyong Mao, Kehan Zhang and Peizhou Liu
Appl. Sci. 2022, 12(4), 2015; https://doi.org/10.3390/app12042015 - 15 Feb 2022
Cited by 12 | Viewed by 2113
Abstract
When the wireless power transfer (WPT) system is installed on the autonomous underwater vehicle (AUV), there is a non-negligible eddy current loss around the coupler. The existence of the ferrite core causes the nonlinear distortion of the magnetic field, which makes the design [...] Read more.
When the wireless power transfer (WPT) system is installed on the autonomous underwater vehicle (AUV), there is a non-negligible eddy current loss around the coupler. The existence of the ferrite core causes the nonlinear distortion of the magnetic field, which makes the design of the WPT coupler more complicated and difficult. In this paper, the key parameters that affect the performance of the coupler were obtained through calculation and finite element analysis (FEA). Then, the coupler was parametrically modeled in Maxwell, and the Non-dominated Sorting Genetic Algorithm (NSGA-II) was used to optimize its design, considering two objective functions: mutual inductance and equivalent coupler loss impedance (ECLI). Finally, twenty groups of Pareto optimal points were evaluated using the Technique for Ordering Preferences by Similarity to Ideal Solution (TOPSIS) method. Five groups of design points with different weights were screened out. The effectiveness of the optimization process was verified by comparing the optimization results with the initial results. Full article
(This article belongs to the Special Issue Magnetically Coupled Wireless Power Transfer System)
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