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Development of compatible induction coil with pure AC for hall effect sensor: A study on metal materials thickness
(2018-12-10)
Sriratana, Witsarut
;
Khwankityotha, Yannadech
;
Satthamsakul, Sutham
This study presents an analysis of the parameters to generate the electromagnetic fields of the induction coils for the application of Hall Effect sensor to classify the aluminum thickness and the classification of the metal materials. In this research three types of induction coil are considered: Type A with one layer, Type B with two layers, and Type C with three layers. Four experiments were conducted. The electromagnetic field of Type C is found to be 11.90% greater than Type B, and 29.26% greater than Type A. The core temperature of Type C with 1 A current applied was found to be 3.50% hotter than Type B and 5.14% hotter than Type A. The classification of the aluminum thickness with the frequency range of 100 Hz to 1.4 kHz are suitable for identifying the thickness of 1, 2 and 3 mm. In terms of the classification of metal materials with all the three types of the induction coil, it can be separated clearly from the samples which consist of steel, stainless steel and aluminum. The total error by using Hall Effect sensor is ±0.5702%.
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Numerical electromagnetic analysis with the PEEC method
(2015-01-01)
Yutthagowith, Peerawut
The conventional full-wave formulation of the partial element equivalent circuit (PEEC) method was derived from the mixed-potential integral equation (MPIE) for the free space by A. E. Ruehli in 1974. The final results are interpreted Maxwell’s equations to a circuit domain by inductance, capacitance, and resistance extraction including retardation in theory. In that time, the retardation is neglected because the minimum wavelength corresponding to the considered maximum frequency is longer than dimensions of an interested domain. His development is based on the concept of inductance and capacitance extraction, which was firstly introduced by Rosa in 1908, and further developed by Grover in 1946 and Hoer and Love in 1965. Despite the fact that the PEEC method has an exact field theoretical basis, it was not primarily developed for the computation of electromagnetic fields. Instead, the circuit designer has a tool at hand to analyze the parasitic effects on connecting structures of circuits without leaving the familiar area of a network theory. This method was considerably developed further in the 1990s where retardation, external field excitation, and the treatment of a dielectric material were investigated.
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Radiation characteristics of inclined slot antenna on conducting spherical cavity
(2003-01-01)
Phongcharoenpanich, C.
;
Boonrod, D.
;
Krairiksh, M.
This paper presents theoretical investigations of the characteristics such as radiation pattern, half-power beamwidth, directivity, front-to-back ratio and polarization of an inclined slot on spherical surface. The total fields inside the cavity are formulated by means of the combination of TE and TM modes. The unknown coefficients of the fields are determined by imposing the boundary conditions. The voltage distribution along the slot is reasonably assumed to be the sinusoidal functions. The numerical results of radiation characteristics for various radii of the spherical surface are illustrated. The comparisons between horizontal slot and inclined slot are reported. The result of the analysis shows that this technique is very useful for the design of spherical slot array antenna of any orientation.

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