Contact-Less Speed Probe Based on Eddy Currents

Cardelli, E.; Faba, A.; Tissi, Francesco

doi:10.1109/tmag.2013.2248701

Cited by 21 publications

(10 citation statements)

References 10 publications

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“…An eddy current speed sensor based on a permanent magnet and a Hall sensor was designed for non-ferromagnetic moving objects without teeth or any other markers, e.g., a metal lining [8]. The sensitive axis of the Hall sensor is oriented orthogonally to the magnet field, so the sensor output is zero for zero speed.…”

Section: Eddy Current Speed Sensorsmentioning

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: Eddy Current Speed Sensorsmentioning

confidence: 99%

“…In this case, the eddy current principle can be utilized. A DC-excited system uses a stationary permanent magnet as a field source [8]. The limitation of this solution is again the temperature stability of the source field.…”

Section: Rotational Inductive Position and Speed Sensorsmentioning

confidence: 99%

Inductive Position and Speed Sensors

Ripka

Blažek

Mirzaei

et al. 2019

Sensors

View full text Add to dashboard Cite

show abstract

“…Another disadvantage of the existing solution is strong dependence on the distance. Speed probe based on eddy currents in metallic body moving in the field of permanent magnet was using Hall sensor, which has poor offset stability [5]. Using speed effects on the induced eddy currents of permanent magnet fields in the moving part was also studied in [6] for metal part defect detection.…”

Section: Introductionmentioning

confidence: 99%

Eddy Current Linear Speed Sensor

et al. 2019

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Novel eddy current speed sensor with axisymmetric coils and solid iron rod as moving part is presented. The analysis is performed both for DC and AC coil currents and for variable iron rod translational speed. The coil inductance and induced voltage results using analytical method and finite element method calculation are compared with measured values. Two different coil configurations are used for simulations and measurement.

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“…Existing magnetic speed sensors usually use permanent magnets or current carrying coils as excitation source. Permanent magnets are either mounted on the moving part or stationaryin b o t h cases the sensors suffer from the temperature depen den ce o f the magnet properties and they are also sensitive to the change in the distance between moving and stationary part [4]- [5].…”

Section: Introductionmentioning

confidence: 99%

“…Speed probe based on eddy currents and reluctance variations in metallic body moving in the field of p erman en t magnet using Hall sensor or pick up coil were p res en ted fo r some applications in [5]- [6]. A speed sensor based on high sensitivity of an amorphous core with ring shape mounted o n solid iron E shape core for magnetic field excitation was shown in [7], which has disadvantage of the necessity of using amorphous core with zero-magnetostriction and sharp rectangular B-H curve.…”

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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Contact-Less Speed Probe Based on Eddy Currents

Cited by 21 publications

References 10 publications

Inductive Position and Speed Sensors

Inductive Position and Speed Sensors

Eddy Current Linear Speed Sensor

Rotational Eddy Current Speed Sensor

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