NDLI: Investigation of a digital eddy current sensor

Content Provider	IEEE Xplore Digital Library
Author	Passenbrunner, Josef Silber, Siegfried Amrhein, Wolfgang
Copyright Year	2015
Description	Author affiliation: Institute for Electrical Drives, and Power Electronics, Johannes Kepler University, Linz, Austria (Passenbrunner, Josef; Amrhein, Wolfgang) \|\| Linz Center of Mechatronics GmbH, Linz, Austria (Silber, Siegfried)
Abstract	Measuring the position of a moving or rotating target is one of the basic tasks for position control applications. Especially in the area of magnetic bearings, this plays a crucial role for stable levitation. Hence, the demand on reliable and affordable position sensor systems is high. Thereby, the sensor should feature high dynamics, a high resolution and low noise. State of the art systems are typically very expensive and, therefore, influence the feasibility of industrial applications. In this paper the working principle of a digital eddy current position sensor is presented which uses the effect of injection locking in oscillators. Due to the digital nature of the pulse width modulated position output signal it is obvious to skip the conversion to an analog signal, by means of low pass filtering. Instead, the controller digital signal processor is used for a time-to-digital conversion of the signal. This has the advantage that the costs of an expensive time to digital converter can be saved. To investigate the behavior, the position sensor system was simulated using a coupled finite element and electronic circuit simulation. Furthermore, measurements on the sensor were conducted to verify the simulation results and to analyze the performance of the sensor. Finally, the sensor system was tested in a one-axis magnetic bearing system and the results are presented.
Starting Page	728
Ending Page	734
File Size	525550
Page Count	7
File Format	PDF
e-ISBN	9781479979417
DOI	10.1109/IEMDC.2015.7409140
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2015-05-10
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Oscillators Resonant frequency Resistors Sensor systems Logic gates Couplings Inductance bearingless motor position sensor eddy current injection locking simulation magnetic bearing
Content Type	Text
Resource Type	Article

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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