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Sensors 2015, 15(10), 26694-26708; doi:10.3390/s151026694

A New Approach to Detect Mover Position in Linear Motors Using Magnetic Sensors

Mechatronics Laboratory, Department of Electrical Engineering, Dong-A University, 840, Hadan-2-dong, Saha-gu, Busan 604-714, Korea
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Academic Editor: Andreas Hütten
Received: 31 August 2015 / Revised: 16 October 2015 / Accepted: 16 October 2015 / Published: 21 October 2015
(This article belongs to the Section Physical Sensors)
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Abstract

A new method to detect the mover position of a linear motor is proposed in this paper. This method employs a simple cheap Hall Effect sensor-based magnetic sensor unit to detect the mover position of the linear motor. With the movement of the linear motor, Hall Effect sensor modules electrically separated 120° along with the idea of three phase balanced condition ( va + vb + vc = 0 ) are used to produce three phase signals. The amplitude of the sensor output voltage signals are adjusted to unit amplitude to minimize the amplitude errors. With the unit amplitude signals three to two phase transformation is done to reduce the three multiples of harmonic components. The final output thus obtained is converted to position data by the use of arctangent function. The measurement accuracy of the new method is analyzed by experiments and compared with the conventional two phase method. Using the same number of sensor modules as the conventional two phase method, the proposed method gives more accurate position information compared to the conventional system where sensors are separated by 90° electrical angles. View Full-Text
Keywords: Hall Effect; linear motor; magnetic sensor; position detection Hall Effect; linear motor; magnetic sensor; position detection
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Paul, S.; Chang, J. A New Approach to Detect Mover Position in Linear Motors Using Magnetic Sensors. Sensors 2015, 15, 26694-26708.

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