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Sensors 2013, 13(6), 7618-7632; doi:10.3390/s130607618

Novel Magnetic Sensing Approach with Improved Linearity

* ,
PERCRO Laboratory, TeCIP Institute, Scuola Superiore Sant'Anna, Piazza Martiri della Libertà 33, Pisa 56127, Italy
* Author to whom correspondence should be addressed.
Received: 28 April 2013 / Revised: 1 June 2013 / Accepted: 1 June 2013 / Published: 13 June 2013
(This article belongs to the Section Physical Sensors)
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This paper introduces a novel contactless sensing principle conceived for measuring the rotation angle of a shaft. The sensor is based on a smart combination of low-cost components that can be effectively integrated in a mechanical assembly of a rotary joint. The working principle is based on the relative rotation of a small diametrically magnetized cylindrical or annular magnet and at least one Hall effect sensor. One of the main strengths of the new sensing principle is to be adaptable to any assigned dimensions and encumbrances without typical design limitations given by the use of standard components. A numerical model is developed for predicting the sensor output characteristic on the base of the concept of magnetic charge. Such a model is validated against results from laboratory experiments. The parameters that define the geometry and layout of the sensor are optimized in order to maximize linearity over an assigned angular range of measurement. Two examples of mechatronic systems that employ the new sensing principle are presented in order to show the possibility of obtaining with the new principle a compact/integrated sensor-design.
Keywords: angle sensor; Hall effect; magnetic charge; low cost; rotation sensor; diametrical magnetization; permanent magnet angle sensor; Hall effect; magnetic charge; low cost; rotation sensor; diametrical magnetization; permanent magnet
This is an open access article distributed under the Creative Commons Attribution License (CC BY) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Fontana, M.; Salsedo, F.; Bergamasco, M. Novel Magnetic Sensing Approach with Improved Linearity. Sensors 2013, 13, 7618-7632.

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