Analysis of a fork-shaped rectangular coil oriented perpendicular to moving conductor slabs

Itaya, Toshiya; Ishida, Koichi; Tanaka, Akio; Takehira, Nobuo; Miki, Toshikatsu

doi:10.1016/j.ndteint.2011.04.002

Cited by 9 publications

(3 citation statements)

References 12 publications

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“…Theodulidis and Kriezis [18] derived a double integral expression for the impedance of a rectangular coil perpendicular to the conductor by the second order vector position (SOVP) method. Itaya et al [19] obtained the impedance and electric potential models of a rectangular coil perpendicular to a moving conductor with finite thickness, incorporating the thickness and velocity in this model. Burke and Ibrahim [20] proposed a closed form expression of the impedance for a pair of circular T-R (driver-pickup) coils with rectangular cross-section perpendicular to the conductor, as shown in figure 1(d).…”

Section: Introductionmentioning

confidence: 99%

A novel model for calculating the impedance of arbitrarily-shaped coils with perpendicular to the planar medium

Wu¹,

Feng²

2022

J. Phys. D: Appl. Phys.

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Some studies have shown that coils placed perpendicular to conductors have excellent detection results for specific defects in eddy-current testing (ECT), where the impedance is an important parameter. The impedance calculation for perpendicular coil is more complex than that for parallel coil, and currently the main focus is on the impedance analysis of circular and rectangular coils. In this paper a closed formula for the impedance of a coil with arbitrary-shape perpendicular to the conductor is given based on the second order vector position (SOVP) method. In the proposed model, a novel shape and position function is defined to extend the coil application to arbitrary shapes. Meanwhile, experimental comparisons are conducted to evaluate the impedance of various coils on an aluminum plate. The result illustrated that the experimental values are in perfect agreement with the calculated ones. Therefore, the proposed model can provide guidance for the impedance calculation of arbitrarily-shaped coils in eddy current testing.

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Section: Introductionmentioning

confidence: 99%

A novel model for calculating the impedance of arbitrarily-shaped coils with perpendicular to the planar medium

Wu¹,

Feng²

2022

J. Phys. D: Appl. Phys.

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“…The eddy current brake is another use of the speed component of the eddy current [21]- [22]. A non-destructive testing method for metals utilizes the same principle, as has been reported in [23]- [24].…”

Section: Introductionmentioning

confidence: 99%

“…Parallel and perpendicular types of eddy current-based speed sensors with air coils for excitation and pick-up voltage were analyzed and measured in detail in [24] and in [29]- [33]. The same parallel configuration as in [33], with one excitation coil and two pick-up coils using a ferrite magnetic yoke, was measured in [34].…”

Section: Introductionmentioning

confidence: 99%

Design and Optimization of an Eddy Current Speed Sensor for Rotating Rods

et al. 2020

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This paper presents the design and optimization of a novel eddy current speed sensor for rotating rods and cylindrical shafts. The sensor consists of one excitation coil and two pick-up coils. All coils are stationary; we consider air coils, and we also use a magnetic yoke. We utilize a copper coating on an iron rod to increase the sensitivity, and we compare the performance with the pe rformance achieved for an uncoated iron rod. 3D FEM is utilized for analyzing and for optimizing the design of the proposed sensor. The main advantages of the novel sensors are the ir simplicity, their low cost and their robust configuration. A linearity error of 0.5% has been achieved. The level of accuracy is limited by mechanical factors. A 1D analytical model has also been de veloped for rapid analysis and optimization of the sensor. An aluminum rod was also used in the measurements for a comparison with the results achieved with the iron rod.

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Design and modeling of a linear speed sensor with a flat type structure and air coils

Mirzaei

Ripka

Chirtsov

et al. 2020

Journal of Magnetism and Magnetic Materials

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This paper presents the design and modeling of a linear eddy current speed sensor with a flat type structure and an air coil configuration. The theory of the eddy current speed sensor is based on utilizing the speed component of the induced currents in a solid moving conductor under stationary or alternating source fields. The stationary part comprises one rectangular excitation coil and two antiserially connected rectangular pickup coils on the left and right sides of the excitation coil in the direction of the trajectory of the moving part. The moving part is considered firstly as a rectangular conductive ferromagnetic solid iron plate, and secondly as a rectangular aluminum plate. A 3D analytical model using Fourier series is developed to analyze the linear speed sensor in Cartesian coordinates. In addition, the 3D numerical finite element method is used for simulations of the linear speed sensor, and the results are compared with the results for analytical methods. The effects of iron permeability on the speed sensor are calculated for a rectangular ferromagnetic solid iron bar or conductor. The experimental results are presented for a linear speed sensor for a rectangular ferromagnetic solid iron plate and also for a rectangular aluminum plate, at variable speeds. The calculation and the experimental results show that the speed sensor outputs differ completely for solid iron conductive plates and for aluminum conductive plates, due to the different electrical conductivities and magnetic permeabilities.

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Analysis of a fork-shaped rectangular coil oriented perpendicular to moving conductor slabs

Cited by 9 publications

References 12 publications

A novel model for calculating the impedance of arbitrarily-shaped coils with perpendicular to the planar medium

A novel model for calculating the impedance of arbitrarily-shaped coils with perpendicular to the planar medium

Design and Optimization of an Eddy Current Speed Sensor for Rotating Rods

Design and modeling of a linear speed sensor with a flat type structure and air coils

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