Eddy Current Linear Speed Sensor

Mirzaei, Mehran; Ripka, Pavel; Chirtsov, Andrey; Vyhnánek, Jan

doi:10.1109/tmag.2018.2872123

Cited by 18 publications

(22 citation statements)

References 11 publications

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“…Sensors 2020, 20, x FOR PEER REVIEW 3 of 15 external magnetic fields, and its sensitivity to small angular mismatches caused by temperature dilatations. A novel eddy current linear speed sensor has been developed for contactless measurements of the translational speed of an iron rod in linear machines and pneumatic and hydraulic cylinders [9]. Instead of a permanent magnet, the system uses an AC excitation coil and two antiserially connected pick-up coils ( Figure 1).…”

Section: Of 15mentioning

confidence: 99%

“…For the developed demonstrator, w = 1.8 mm, h = 5 mm, d = 10 mm, and r = 10 mm. Reproduced from [9] with the permission of IEEE. A coaxial eddy current linear speed sensor: sensor configuration with excitation coil in the middle and two sensing coils which are connected antiserially.…”

Section: Figurementioning

confidence: 99%

“…For the developed demonstrator, w = 1.8 mm, h = 5 mm, d = 10 mm, and r = 10 mm. Reproduced from [9] with the permission of IEEE.…”

Section: Figurementioning

confidence: 99%

“…For the developed demonstrator, w = 1.8 mm, h = 5 mm, d = 10 mm, and r = 10 mm. Reproduced from [9] with the permission of IEEE. A flat sensor of similar type uses rectangular excitation and sensing coils with axis perpendicular to the speed direction.…”

Section: Figurementioning

confidence: 99%

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Inductive Position and Speed Sensors

Ripka

Blažek

Mirzaei

et al. 2019

Sensors

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Magnetic position and speed sensors are rugged and durable. While DC magnetic sensors use permanent magnets as a field source and usually have only mm or cm range, inductive sensors use electromagnetic induction and they may work up to a distance of 20 m. Eddy current inductive sensors equipped with magnetoresistive sensors instead of inductive coils can operate at low frequencies, allowing detection through a conductive wall. In this paper, we make an overview of existing systems and we present new results in eddy current velocity and position measurements. We also present several types of inductive position sensors developed in our laboratories for industrial applications in pneumatic and hydraulic cylinders, underground drilling, large mining machines, and for detecting ferromagnetic objects on conveyors. While the most precise inductive position sensors have a resolution of 10 nm and linearity of 0.2%, precision requirements on the industrial sensors which we develop are less demanding, but they should have large working distance and large resistance to environmental conditions and interference.Sensors 2020, 20, 65 2 of 15 Eddy Current Inductive SensorsAn advantage of eddy current position and speed sensors is that they do not require a ferromagnetic target: Any conducting material can be used.Author Contributions: Conceptualization, P.R. and J.B.; design, calculations, and measurements: M.M., P.L., M.Š., and K.D.; writing-original draft preparation, P.R. and J.B.; writing-review and editing, all authors.

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Section: Of 15mentioning

confidence: 99%

Section: Figurementioning

confidence: 99%

“…For the developed demonstrator, w = 1.8 mm, h = 5 mm, d = 10 mm, and r = 10 mm. Reproduced from [9] with the permission of IEEE.…”

Section: Figurementioning

confidence: 99%

Section: Figurementioning

confidence: 99%

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Inductive Position and Speed Sensors

Ripka

Blažek

Mirzaei

et al. 2019

Sensors

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“…Non-ferromagnetic moving conductors such as aluminum are only used in [5]- [11], which are not complicated for measurement and simulations. An eddy current linear speed sensor with axisymmetric structure was developed and measured at variable linear speeds with ferromagnetic iron rod [12], which magnetic relative permeability was measured and estimated for precise simulations and analysis. Rotational eddy cu rrent speed sensor could be very appropriate option for some applications such as turbochargers [13]- [15], which is problematic for conventional speed sensor.…”

Section: Introductionmentioning

confidence: 99%

Rotational Eddy Current Speed Sensor

et al. 2019

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A novel eddy current speed sensor is develope d to measure rotational speed of conductive o bj e ct s. Th e s e nso r co ns ist s o f o n e e xcitation coil and two pick up coils around rotating cylinder or rod. The sensor does not use magnetic y o ke. Fo r t h e a n aly si s a n d e xperimental verification we used 30 mm diameter non-magnetic aluminum and also magnetic solid iron cylinders. The calculated and me asured speed range is until 1200 rpm. 2D analytical method is developed to calculate sensor performance. 2D finite element i s a l so use d for simulations to compare results with 2D analytical method. 3D finite elemen t a n a lys is i s requ ired t o t a k e i nt o a cco u nt significant 3D effects due to the air coils configuration. The experimental results are presented at different steady s t a te s pe eds. Th e calculations results are compared with measurements to validate theoretical models and sensor performance. The eddy current s pe ed se nsor shows high linearity even at low speeds. For ferromagnetic rods we suggest novel double-layer configura t io n: n on-m ag net ic conductive ring or shell on top of the iron rod minimizes the influence of the permeability changes. The main advantage o f t h e n o vel se nsor is that it has neither mechanical nor electrical contact to the rotating 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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Eddy Current Linear Speed Sensor

Cited by 18 publications

References 11 publications

Inductive Position and Speed Sensors

Inductive Position and Speed Sensors

Rotational Eddy Current Speed Sensor

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

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