Analytical tool for optimization of position sensors based on eddy currents effect

Faria, Andreia Raquel S.; Marques, L.; Vale, Luís Sérgio Rodrigues; Ferreira, Carlos; Alves, Filipe; Cabral, Jorge

doi:10.1016/j.heliyon.2022.e11920

Cited by 3 publications

(1 citation statement)

References 13 publications

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“…In typical AMB levitated high-speed machine applications, the displacement of the rotor in the mechanical air gap is measured with commercially available eddy-current-based displacement sensors [ 16 , 17 , 19 , 20 , 21 , 22 ]. In recent years, these sensors have gained increasing scientific attention [ 23 , 24 , 25 , 26 , 27 , 28 ] due their wide range of applications in health [ 29 ], aerospace [ 30 ] and automotive [ 31 ] fields. Additionally, improving sensor operational parameters for AMB systems has become an actual challenge for development [ 32 , 33 , 34 , 35 ].…”

Section: Introductionmentioning

confidence: 99%

The Influence of Magnetic Field of AMB on Eddy-Current Sensor Operation

Kurnyta-Mazurek

Kurnyta

2023

Sensors

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This paper presents laboratory results on the influence of the magnetic field of an active magnetic bearing (AMB) on the eddy-current sensor operation. The magnetic suspension technology enables continuous diagnostics and monitoring of a rotary machine and eliminates drawbacks of classical bearing properties. The magnetic bearing system usually consists of two radial and one axial magnetic bearing. It is combined with a control unit, amplifiers and sensors for measuring the instantaneous position of the shaft. For this purpose, eddy-current sensors are frequently used. They operate in close proximity to the electromechanical actuators; therefore, the question arises whether the actuators do not interfere with the correct operation of these sensors. In the paper, the test rig and research plan prepared for that investigation are delivered. Measurement signals were registered from four control channels for different configurations of power supplies for system elements, e.g., with sensors and AMBs turned off, with sensors turn on and at normal work. Recorded time courses are presented and discussed in the paper. For the prepared test rig and AMB/eddy-current sensor configuration, no significant influence of the generated magnetic field from the support is found for the eddy-current sensor output.

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Section: Introductionmentioning

confidence: 99%

The Influence of Magnetic Field of AMB on Eddy-Current Sensor Operation

Kurnyta-Mazurek

Kurnyta

2023

Sensors

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Design of automatic and integrated calibration device for dynamic characteristics of eddy-current sensor

Ma,

Qiu,

Deng

et al. 2024

J. Phys.: Conf. Ser.

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To realize the dynamic calibration of eddy current sensor with high precision and high efficiency in a wide frequency range, a set of standard shaking table was designed as the actuator for the dynamic calibration of eddy current sensor, and the modal analysis and harmonic response analysis of the vibration disk were completed. At the same time, the control system was designed based on FPGA. The design of control system includes the design of signal generator with adjustable frequency and amplitude, data collector and communication module. Finally, the dynamic test and analysis of the eddy current sensor dynamic calibration disk was completed and the calibration accuracy of the standard vibration table is verified by comparative method. The deviation is less than 3% at the whole frequency band from 10-500HZ, which meets the design requirements.

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Design and Analysis of Receiver Coils with Multiple In-Series Windings for Inductive Eddy Current Angle Position Sensors Based on Coupling of Coils on Printed Circuit Boards

Kuntz,

Gerber,

Gerlach

et al. 2024

Sensors

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We present a method for improving the amplitude and angular error of inductive position sensors, by advancing the design of receiver coil systems with multiple windings on two layers of a printed circuit board. Multiple phase-shifted windings are connected in series, resulting in an increased amplitude of the induced voltage while decreasing the angular error of the sensor. The amplitude increase for a specific number of windings can be predicted in closed form. Windings are placed electrically in series by means of a differential connection structure, without adversely affecting the signal quality while requiring a minimal amount of space in the layout. Further, we introduce a receiver coil centerline function which specifically enables dense, space-constrained designs. It allows for maximization of the number of possible coil windings while minimizing the impact on angular error. This compromise can be fine-tuned freely with a shape parameter. The application to a typical rotary encoder design for motor control applications with five periods is presented as an example and analyzed in detail by 3D finite-element simulation of 18 different variants, varying both the number of windings and the type of centerline functions. The best peak-to-peak angular error achieved in the examples is smaller than 0.1° electrically (0.02° mechanically, periodicity 5) under nominal tolerance conditions, in addition to an amplitude increase of more than 170% compared to a conventional design which exhibits more than twice the angular error. Amplitude gains of more than 270% are achieved at the expense of increased angular error.

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Analytical tool for optimization of position sensors based on eddy currents effect

Cited by 3 publications

References 13 publications

The Influence of Magnetic Field of AMB on Eddy-Current Sensor Operation

The Influence of Magnetic Field of AMB on Eddy-Current Sensor Operation

Design of automatic and integrated calibration device for dynamic characteristics of eddy-current sensor

Design and Analysis of Receiver Coils with Multiple In-Series Windings for Inductive Eddy Current Angle Position Sensors Based on Coupling of Coils on Printed Circuit Boards

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