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2D hall sensor array for measuring the position of a magnet matrix

  • Hyeong Joon Ahn
  • Kyoung Rock Kim
Article

Abstract

Hall sensor array is used to measure the position of a magnet array and needs compensation of errors caused by manufacturing tolerances as well as harmonic components of the magnetic flux of the magnet array. This paper presents a 2D hall sensor array to measure the position of a magnet matrix by filtering harmonic components. First, 1D sensor array to filter out arbitrary number of harmonic signals is proposed and extended to 2D sensor array for the position measurement of a magnet matrix. A 2D hall sensor array for filtering both fundamental and 2nd harmonic components of the magnetic flux and its conditioning circuit board are built to measure the position of the magnet matrix for a planar motor. Finally, performances of filtering harmonics and measuring position of the magnet matrix are experimentally verified with a XY linear motion stage. The proposed 2D hall sensor array is compatible to a sine encoder and is directly applicable to commercial motion controllers.

Keywords

Hall sensor Sensor array Filter Harmonic components Displacement sensor for magnet matrix 

Nomenclature

A

Sensor gain

f

Sensor output

Li

ith Sensor location

Wn

Total width of sensor array of n sensors

x

Physical quantity (displacement)

α

Phase angle of harmonic component

λ

Wavelength of harmonic component

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Copyright information

© Korean Society for Precision Engineering and Springer-Verlag Berlin Heidelberg 2014

Authors and Affiliations

  1. 1.Department of Mechanical EngineeringSoogsil UnviersitySeoulSouth Korea
  2. 2.Graduate School. Department of Mechanical EngineeringSoogsil UnviersitySeoulSouth Korea

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