Prohlížení Publikační činnost ČVUT dle autora "Grim V."
-
A 3-Phase Current Transducer based on microfluxgate sensors
Autor: Ripka P.; Grim V.; Chirtsov A.
(Elsevier, 2019)Novel 3-phase DC/AC current transducer for 3-phase current lines is based on 8 integrated fluxgate sensors. Using full information from each sensor rather than gradiometric pairs, we suppress crosstalk between individual ... -
The apparent permeability and the amplification factor of magnetic wires and wire arrays
Autor: Ripka P.; Grim V.; Mirzaei M.
(Elsevier, 2021)We have calculated and plotted the apparent permeability and the demagnetization factor of single magnetic wires. We have also confirmed the accuracy of the analytical formula for the conversion between the apparent ... -
An Axial Airgap Eddy Current Speed Sensor
Autor: Mirzaei M.; Grim V.; Ripka P.
(IEEE Industrial Electronics Society, 2022)This paper presents a novel configuration of the eddy current speed sensor to measure the rotating speed of iron rods and shafts up to 3000 rpm. The proposed eddy current speed sensor has an axial airgap structure with ... -
An axial flux eddy current sensor with perpendicular coils for speed measurement
Autor: Mirzaei M.; Ripka P.; Grim V.; Hazdra Z.
(Elsevier, 2024)This paper presents an axial flux eddy current sensor with a compact and simple structure for measuring the rotating speed of iron shafts. The sensor structure is optimized for high sensitivity with a novel configuration ... -
C-Shape Busbar With Frequency Invariant Points for Wideband Current Measurement
Autor: George N.; Ripka P.; Grim V.
(IEEE Industrial Electronics Society, 2024)A yokeless busbar current transducer with frequency-invariant points is presented for the first time in this article. Existing rectangular busbar current transducers suffer from the frequency dependency issue due to the ... -
DC current sensor using switching-mode excited in-situ current transformer
Autor: Grim V.; Ripka P.; Bauer J.
(Elsevier, 2020)DC current component in the power grid may cause gross measurement errors and lead to overheating of power transformers. We have previously developed method how to measure DC current using fluxgate effect in existing current ... -
Design and modeling of a linear speed sensor with a flat type structure and air coils
Autor: Mirzaei M.; Ripka P.; Chirtsov A.; Vyhnánek J.; Grim V.
(Elsevier, 2020)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 ... -
Design and Modeling of An Axisymmetric Eddy Current Sensor for Speed Measurement of Nonmagnetic Rods
Autor: Mirzaei M.; Ripka P.; Macháč J.; Grim V.; Svatoš J.
(Elsevier, 2022)This paper presents the design and modeling of an eddy current speed sensor for nonmagnetic moving rods with an axisymmetric configuration. The sensor consists of two antiserially connected excitation coils and one pick ... -
Design and Optimization of an Eddy Current Speed Sensor for Rotating Rods
Autor: Mirzaei M.; Ripka P.; Grim V.; Chirtsov A.
(IEEE Sensors Council, 2020)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 ... -
Design of a flat-type magnetic position sensor using a finite-difference method
Autor: Mirzaei M.; Macháč J.; Ripka P.; Chirtsov A.; Vyhnánek J.; Grim V.
(The Institution of Engineering and Technology (IET), 2020)This study presents an analysis and the design of a new flat-type position sensor with an external armature. One excitation coil and two antiserially connected pickup coils are used in the stationary part. Solid iron ... -
An eddy current speed sensor with a novel configuration of longitudinal and transversal coils
Autor: Mirzaei M.; Ripka P.; Grim V.
(Elsevier, 2023)This paper presents a novel eddy current speed sensor for linear speed measurement of moving flat iron parts. The main goal of the paper is to present an efficient eddy current speed sensor with high sensitivity and ... -
Eddy current speed sensor with magnetic shielding
Autor: Mirzaei M.; Ripka P.; Chirtsov A.; Grim V.
(Elsevier, 2020)This paper presents the design and analysis of a new eddy current speed sensor with ferromagnetic shielding. Aluminum and solid iron are considered for the moving part. One excitation coil and two antiserially connected ... -
A Fluxgate Current Sensor With an Amphitheater Busbar
Autor: Ripka P.; Přibil M.; Petrucha V.; Grim V.; Draxler K.
(IEEE, 2016)Large dc and ac electric currents are often measured by open-loop sensors without a magnetic yoke. A widely used configuration uses a differential magnetic sensor inserted into a hole in a flat busbar. The use of a ... -
A Linear Eddy Current Speed Sensor for Speed Measurement of Conductive Objects
Autor: Mirzaei M.; Ripka P.; Grim V.
(IEEE, 2022)This paper presents the novel structure of an eddy current sensor for linear speed measurements. The sensor has one excitation coil and two pairs of antiserially connected pick-up coils, which are located inside and outside ... -
Modeling of hysteresis loops using rational and power functions
Autor: Mirzaei M.; Ripka P.; Vyhnánek J.; Chirtsov A.; Grim V.
(Elsevier, 2021)Simple and precise hysteresis models with a small number of parameters allowing fast calculation are required for the magnetic analysis, as the field is calculated in a very large number of points. This paper presents a ... -
Multiwire Parallel Fluxgate Sensors
Autor: Ripka P.; Hrakova D.; Grim V.; Mirzaei M.
(IEEE, 2022)Fluxgate sensors with straight wire or rod cores are used in NDT, portable gradiometers and sensor arrays and for the detection of small objects. We show that their sensitivity at the voltage output mode depends on the ... -
A Novel Eddy Current Speed Sensor with Ferrite E-Core
Autor: Mirzaei M.; Ripka P.; Grim V.
(IEEE, 2020)This letter presents a novel speed sensor based on motion-induced eddy currents in conductive moving parts. The magnetic yoke is an E-shaped ferrite core. The excitation coil is on the center leg of the E-core, and two ... -
A Novel Position Sensor With a Conical Iron Core
Autor: Mirzaei M.; Ripka P.; Grim V.
(IEEE, 2020)A novel position sensor for pneumatic and hydraulic cylinder applications is presented in this paper. The solid iron core conical in shape surrounded by axisymmetric coils is an essential part of the proposed position ... -
A Novel Structure of an Eddy Current Sensor for Speed Measurement of Rotating Shafts
Autor: Mirzaei M.; Ripka P.; Grim V.
(IEEE Power & Energy Society, 2023)This paper presents a novel structure of an eddy current sensor for the measurement of rotational speed. The sensor has a perpendicular configuration of the excitation coil and the pick-up coil. Its maximum nonlinearity ... -
A Position Sensor with Novel Configuration of Linear Variable Differential Transformer
Autor: Mirzaei M.; Ripka P.; Grim V.
(IEEE Sensors Council, 2021)This paper presents a position sensor based on a novel configuration of linear variable differential transformer. Design and optimization of the position sensor using finite element method are presented. The measurements ...