Simplified Calculation Method of Planar Coil Impedance Considering the Eddy Current Distribution by Using Finite Element Method

2014 ◽  
Vol 792 ◽  
pp. 215-220 ◽  
Author(s):  
Hiroyuki Wakiwaka ◽  
Daisuke Ito ◽  
Kunihisa Tashiro ◽  
Hisashi Yajima ◽  
Yuji Manta ◽  
...  
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Eddy Current ◽  
Calculation Method ◽  
Metal Plate ◽  
Current Sensor ◽  
Planar Coil ◽  
Simplified Calculation ◽  
Element Method ◽  
Simplified Calculation Method

Eddy current sensors have various uses. However, there are few studies which show theinfluence of a conductor on the impedance of a detector coil using theoretical formulae. This papershows a simplified calculation method for impedance of a planar coil while considering the influenceof eddy current. An eddy current distribution in a metal plate facing to planar coil was calculatedusing finite element method. It assumed the metal plate to be a one-turn coil that can change shape.Therefore, the impedance of a planar coil considering the influence of the eddy current can beestimated from an equivalent circuit. In addition, calculations were simplified by estimating mutualinductance between the planar coil and the metal plate from an area ratio. This simplified calculationmethod can estimate impedance with the same accuracy as finite element method. The calculatedvalue agrees to within ±2.44 % of the measured value. The computation time was shortened by 1/20.Therefore, it can be immediately estimated how each parameter of a planar coil or a target influencesthe characteristic of the eddy current sensor. This simplified calculation method is useful for anoptimum design of an eddy current sensor.

scholarly journals Simplified Calculation Method of Impedance of a Planar Coil in Consideration of the Influence Depending on Eddy Current

2013 ◽  
Vol 21 (2) ◽  
pp. 234-239 ◽  
Author(s):  
Daisuke ITO ◽  
Toshimitu FUJIOKA ◽  
Hiroyuki WAKIWAKA ◽  
Kunihisa TASHIRO ◽  
Hisashi YAJIMA ◽  
...  
Keyword(s):  
Eddy Current ◽  
Calculation Method ◽  
Planar Coil ◽  
Simplified Calculation ◽  
Simplified Calculation Method

A MSFEM to simulate the eddy current problem in laminated iron cores in 3D

2019 ◽  
Vol 38 (5) ◽  
pp. 1667-1682 ◽  
Author(s):  
Karl Hollaus
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Eddy Current ◽  
Eddy Currents ◽  
Three Dimensional ◽  
Harmonic Balance Method ◽  
Three Dimensions ◽  
Magnetic Vector Potential ◽  
Content Type ◽  
Element Method

Purpose The simulation of eddy currents in laminated iron cores by the finite element method (FEM) is of great interest in the design of electrical devices. Modeling each laminate by finite elements leads to extremely large nonlinear systems of equations impossible to solve with present computer resources reasonably. The purpose of this study is to show that the multiscale finite element method (MSFEM) overcomes this difficulty. Design/methodology/approach A new MSFEM approach for eddy currents of laminated nonlinear iron cores in three dimensions based on the magnetic vector potential is presented. How to construct the MSFEM approach in principal is shown. The MSFEM with the Biot–Savart field in the frequency domain, a higher-order approach, the time stepping method and with the harmonic balance method are introduced and studied. Findings Various simulations demonstrate the feasibility, efficiency and versatility of the new MSFEM. Originality/value The novel MSFEM solves true three-dimensional eddy current problems in laminated iron cores taking into account of the edge effect.

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