scholarly journals Phenomenon Analysis and Improvement of Magnetic Shield Fringe Effect on Wireless Power Transmission of EV

2021 ◽  
Vol 12 (4) ◽  
pp. 252
Author(s):  
Yening Sun ◽  
Yao Wei ◽  
Yi Tian
Keyword(s):  
Magnetic Field ◽  
Field Strength ◽  
Magnetic Field Strength ◽  
Power Transmission ◽  
Wireless Power ◽  
Wireless Power Transmission ◽  
Soft Magnetic ◽  
Magnetic Shield ◽  
Electrical Vehicle ◽  
Fringe Effect

An increment of magnetic field strength inevitably appears at the shield edge if a magnetic shield is made of a soft magnetic material, and that increment becomes more serious if this shield is combined with the chassis of an electrical vehicle (EV). This phenomenon is caused by the fringe effect, which limits the transfer efficiency of the coupler for the wireless power transmission (WPT) systems of EV. This phenomenon, and its relationships with some parameters, are analyzed in this paper, and these relationships are fitted to estimate the increment for different shield structures. A magnetic shield structure to reduce the increment of the magnetic field strength and improve coupler efficiency is herein proposed. The effectiveness and correctness of the fitting curves and the advantages of the proposed shield structure are demonstrated by finite element analyses results.

scholarly journals Optimization of a Two-Layer 3D Coil Structure with Uniform Magnetic Field

2021 ◽  
Vol 2021 ◽  
pp. 1-11
Author(s):  
Davor Vinko ◽  
Domagoj Bilandžija ◽  
Vanja Mandrić Radivojević
Keyword(s):  
Magnetic Field ◽  
Field Strength ◽  
Magnetic Field Strength ◽  
Field Distribution ◽  
Uniform Magnetic Field ◽  
Optimization Method ◽  
Magnetic Field Distribution ◽  
Wireless Power ◽  
Average Magnetic Field ◽  
Coil Structure

Conventional magnetically coupled resonant wireless power transfer systems are faced with resonant frequency splitting phenomena and impedance mismatch when a receiving coil is placed at misaligned position. These problems can be avoided by using uniform magnetic field distribution at receiving plane. In this paper, a novel 3D transmitting coil structure with improved uniform magnetic field distribution is proposed based on a developed optimization method. The goal is to maximize the average magnetic field strength and uniform magnetic field section of the receiving plane. Hence, figures of merit (FoM1 and FoM2) are introduced and defined as product of average magnetic field strength and length or surface along which uniform magnetic field is generated, respectively. The validity of the optimization method is verified through laboratory measurements performed on the fabricated coils driven by signal generator at operating frequency of 150 kHz. Depending on the allowed ripple value and predefined coil proportions, the proposed transmitting coil structure gives the uniform magnetic field distribution across 50% to 90% of the receiving plane.

scholarly journals Distribution of Magnetic Field in 400 kV Double-Circuit Transmission Lines

2020 ◽  
Vol 10 (9) ◽  
pp. 3266 ◽  
Author(s):  
Ramūnas Deltuva ◽  
Robertas Lukočius
Keyword(s):  
Magnetic Field ◽  
Field Strength ◽  
Transmission Line ◽  
Magnetic Field Strength ◽  
Transmission Lines ◽  
Power Transmission ◽  
Power Transmission Line ◽  
Overhead Transmission Line ◽  
The City ◽  
The Magnetic Field

A high-voltage AC double-circuit 400 kV overhead power transmission line runs from the city of Elk (Poland) to the city of Alytus (Lithuania). This international 400 kV power transmission line is potentially one of the strongest magnetic field-generating sources in the area. This 400 kV voltage double-circuit overhead transmission line and its surroundings were analyzed using the mathematical analytical methods of superposition and reflections. This research paper includes the calculation of the numerical values of the magnetic field and its distribution. The research showed that the values of the magnetic field strength near the international 400 kV power transmission line exceed the threshold values permitted by relevant standards. This overhead power line is connected to the general (50 Hz) power system and generates a highly intense magnetic field. It is suggested that experimental trials should be undertaken in order to determine the maximum values of the magnetic field strength. For the purpose of mitigating these values, it is suggested that the height of the support bars should be increased or that any individual and commercial activities near the object under investigation should be restricted.

A method for improving the wireless power transmission efficiency of an endoscopic capsule based on electromagnetic localization and synthesis of magnetic field vector

2010 ◽  
Vol 224 (7) ◽  
pp. 1463-1471 ◽  
Author(s):  
H Li ◽  
G Yan ◽  
P Gao
Keyword(s):  
Magnetic Field ◽  
Power Transmission ◽  
Field Vector ◽  
Magnetic Field Vector ◽  
Wireless Power ◽  
Wireless Power Transmission ◽  
Electromagnetic Localization ◽  
Endoscopic Capsule

The method of wireless power transmission is an important method in powering wireless medical devices in vivo, but the efficiency is still low, especially when the devices move freely in random positions and orientations. Aiming at powering an endoscopic capsule, a method for improving efficiency of wireless power transmission is proposed, which is based on electromagnetic localization and synthesis of magnetic field vector. By analysing the model and experimenting in vitro, the proposed method is verified, which can improve the efficiency of the wireless power transmission because of accurate localization of the capsule and synthesis of magnetic field vector.

Research on Wireless Power Transmission Based on Magnetic Resonance Coupling

2013 ◽  
Vol 811 ◽  
pp. 651-656
Author(s):  
Hao Wang ◽  
An Na Wang ◽  
Qiang Zhao ◽  
Yu Zhang
Keyword(s):  
Magnetic Field ◽  
Magnetic Resonance ◽  
Power Transmission ◽  
Coupled Mode Theory ◽  
Wireless Power ◽  
Wireless Power Transmission ◽  
Coupled Mode ◽  
Magnetic Resonance Coupling ◽  
Resonance Coupling ◽  
Resonance Process

e. The formalism of wireless power transmission is discussed coupled mode theory can be used to describe the resonance process. According to the changing process of input impedance and input current to describe the demarcate of resonant frequency. also demonstrate that loop circuits have an important effect of the resonant magnetic field distribution.

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