Design of a flat‐type magnetic position sensor using a finite‐difference method

Mirzaei, Mehran; Macháč, Jan; Ripka, Pavel; Chirtsov, Andrey; Vyhnánek, Jan; Grim, Václav

doi:10.1049/iet-smt.2019.0197

Cited by 6 publications

(9 citation statements)

References 29 publications

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“…Therefore, linear magnetic simulations are performed. And initial relative magnetic permeability, µr = 1000 for the steel lamination is estimated and considered for the FEM analysis [13] and [26]. The conductivity of steel lamination was measured, wh ich is σ = 3.14 MS/m.…”

Section: Fem Studymentioning

confidence: 99%

A Position Sensor With Novel Configuration of Linear Variable Differential Transformer

2021

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Th is paper presents a position sensor ba s ed o n a novel configuration of linear variable differential transform er. Design and optimization of the position sensor a re pre sent ed using finite element method. The sensor has short air core coi ls and long magnetic armatures. The arrangement direction of the re ctangular excitation coil and two antiserially connected re ctangular pick up coils is perpendicular to the motion direction of the position sensor. The coils are located be t ween two parallel silicon steel laminations a s t he a rm a t ures. Th e position sensor is optimized wi th compromise between minimization of nonlinearity error and maximum s e nsit ivi t y. The main advantage of the proposed position sensor is the small ratio of coils dimensions to the working range. The position sensor is operated for the measurements and calculations at excit at io n fre quencies, 500 Hz and 1000 Hz and 2000 Hz. The maximum nonlinearity error is less than 1.5% for theoretical analysis a nd i t i s le ss than 2% for the measurement results in ±90 mm position range.

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Section: Fem Studymentioning

confidence: 99%

A Position Sensor With Novel Configuration of Linear Variable Differential Transformer

2021

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“…New designs of transformer position sensors are constantly developed and analysed to improve their industrial applicability. Finite element method (FEM) is often used for modeling and analysis of new sensor design [ 1 , 2 , 3 , 4 , 5 , 6 , 7 ]. In [ 1 ], the electromagnetic behavior of an LVDT sensor in the presence of magnetic interference is modeled using FEM, and the quality of the simulation is verified through comparisons with experimental results.…”

Section: Introductionmentioning

confidence: 99%

“…In [ 1 ], the electromagnetic behavior of an LVDT sensor in the presence of magnetic interference is modeled using FEM, and the quality of the simulation is verified through comparisons with experimental results. In order to optimize the sensor design, [ 2 ] uses FEM to study the magnetic field distribution of a flat-type magnetic position sensor. In [ 3 ], the electromagnetic behavior of differential inductive displacement sensors is modelled using FEM, and the parameters impacting the sensor’s time drift stability are analysed.…”

Section: Introductionmentioning

confidence: 99%

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Methodology for Eddy Current Losses Calculation in Linear Variable Differential Transformers (LVDTs)

Drandić

Frljić

Trkulja

2023

Sensors

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Linear variable differential transformer (LVDT) is a commonly used linear displacement sensor because of its good measurement characteristics. When using laminated ferromagnetic cores in LVDTs, it is very important to take eddy currents into the account during design phase of the sensor. Particularity of the open-type core means that the eddy currents induced by the stray magnetic flux that flow in large loops tangential to the lamination surfaces take on significant values. Due to the open-type core a typical LVDT has, depending on the core material, it is, therefore, very important to take eddy currents into the account when designing the sensor. This paper’s goal is to present a methodology for calculating LVDT eddy current losses that can be applied to LVDT design in order to optimize the dimensions and help with selection of materials of the LVDTs, in order to achieve the highest measurement accuracy. Presented approach using an AτA-formulation with elimination of redundant degrees of freedom exhibits rapid convergence. In order to calculate the relationship between eddy current losses and core displacement, frequency, and material characteristics, a number of 3D finite element method (FEM) simulations was performed. Analysis of the obtained results using presented methodology for eddy current losses calculation in LVDTs enables the designer optimize the design of the LVDT.

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“…Even though it offers a flexible and easy-to-set-up modeling environment, such FEM analysis is computationally very demanding, which limits its use in modeling practical systems with a large air-gap-to-skindepth ratio. Similarly, in [10], a finite-difference method is used to model a sensor with rectangular excitation and pickup coils with a magnetic yoke.…”

Section: Introductionmentioning

confidence: 99%

Three-Dimensional Analytical Modeling of an Eddy-Current-Based Non-Contact Speed Sensor

Tüysüz

Stolz

Muetze

et al. 2021

IEEE Open J. Ind. Applicat.

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This paper presents a computationally efficient, three-dimensional electromagnetic model for eddy-current-based speed sensors featuring an injection coil, two or more pick-up coils and a magnetic yoke. The superposition of incident and reflected fields, which was adopted in previous works, is replaced by a direct formulation; and Maxwell's equations are solved for the magnetic flux density vector, rather than involving a higher-order vector potential. The injected current is accounted for in the boundary conditions, and special attention is given to the modeling of the in-plane spreading of the coils by deriving coil-linkage functions. The magnetic field and eddy current distributions in the whole problem space is obtained by algebraically solving a 12-by-12 linear equation system. Results of the model are compared to experimental results from earlier publications for verifying the validity of the models. Even though derived primarily with the eddy-current-based speed sensing application in mind, the analysis presented in this paper can potentially contribute to various other eddy-current-based applications such as non-destructive testing, where probes with a magnetic yoke are utilized.

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Design of a flat‐type magnetic position sensor using a finite‐difference method

Cited by 6 publications

References 29 publications

A Position Sensor With Novel Configuration of Linear Variable Differential Transformer

A Position Sensor With Novel Configuration of Linear Variable Differential Transformer

Methodology for Eddy Current Losses Calculation in Linear Variable Differential Transformers (LVDTs)

Three-Dimensional Analytical Modeling of an Eddy-Current-Based Non-Contact Speed Sensor

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