Highly effective leakage magnetic field suppression by using a reactive coil in perfectly aligned EV wireless charging systems

Interference electron microscopy enables us to record the phase distribution of an electron wave on a hologram. The distribution is visualized as a fringe pattern in a micrograph by optical reconstruction. The phase is affected by electromagnetic potentials; scalar and vector potentials. Therefore, the electric and magnetic field can be reduced from the recorded phase. This study analyzes a leakage magnetic field from CoCr perpendicular magnetic recording media. Since one contour fringe interval corresponds to a magnetic flux of Φo(=h/e=4x10-15Wb), we can quantitatively measure the field by counting the number of finges. Moreover, by using phase-difference amplification techniques, the sensitivity for magnetic field detection can be improved by a factor of 30, which allows the drawing of a Φo/30 fringe. This sensitivity, however, is insufficient for quantitative analysis of very weak magnetic fields such as high-density magnetic recordings. For this reason we have adopted “fringe scanning interferometry” using digital image processing techniques at the optical reconstruction stage. This method enables us to obtain subfringe information recorded in the interference pattern.

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Magnetic field suppression of flow in semiconductor melt

10.2514/6.2000-698 ◽

2000 ◽

Cited By ~ 1

Author(s):

Alexander Fedoseyev ◽

Edward Kansa ◽

Carlos Marin ◽

Martin Volz ◽

Aleksandr Ostrogorsky

Keyword(s):

Magnetic Field ◽

Field Suppression

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Investigating flexible textile-based coils for wireless charging wearable electronics

Journal of Industrial Textiles ◽

10.1177/1528083719831086 ◽

2019 ◽

Vol 50 (3) ◽

pp. 333-345 ◽

Cited By ~ 2

Author(s):

Danmei Sun ◽

Meixuan Chen ◽

Symon Podilchak ◽

Apostolos Georgiadis ◽

Qassim S Abdullahi ◽

...

Keyword(s):

Magnetic Field ◽

Electrical Conductivity ◽

Electromagnetic Field ◽

Electric Field ◽

Dimensional Stability ◽

Screen Printing ◽

Wearable Electronics ◽

Wireless Charging ◽

The Magnetic Field ◽

Screen Printed

Smart and interactive textiles have been attracted great attention in recent years. This research explored three different techniques and processes in developing textile-based conductive coils that are able to embed in a garment layer. Coils made through embroidery and screen printing have good dimensional stability, although the resistance of screen printed coil is too high due to the low conductivity of the print ink. Laser cut coil provided the best electrical conductivity; however, the disadvantage of this method is that it is very difficult to keep the completed coil to the predetermined shape and dimension. The tested results show that an electromagnetic field has been generated between the textile-based conductive coil and an external coil that is directly powered by electricity. The magnetic field and electric field worked simultaneously to complete the wireless charging process.

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