The Transactions of The Korean Institute of Electrical Engineers (전기학회논문지)

The Korean Institute of Electrical Engineers (대한전기학회)
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On-line Compensation Method for Magnetic Position Sensor using Recursive Least Square Method

재귀형 최소 자승법을 이용한 자기 위치 센서의 실시간 보상 방법

  • 김지원 (한국전기연구원 전동력 연구센터) ;
  • 문석환 (한국전기연구원 전동력 연구센터) ;
  • 이지영 (한국전기연구원 전동력 연구센터) ;
  • 장정환 (동아대학교 전기공학과) ;
  • 김장목 (부산대학교 전기공학과)
  • Received : 2011.09.27
  • Accepted : 2011.11.04
  • Published : 2011.12.01
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Abstract

This paper presents the error correction method of magnetic position sensor using recursive least square method (RLSM) with forgetting factor. Magnetic position sensor is proposed for linear position detection of the linear motor which has tooth shape stator, consists of permanent magnet, iron core and linear hall sensor, and generates sine and cosine waveforms according to the movement of the mover of the linear motor. From the output of magnetic position sensor, the position of the linear motor can be detected using arc-tan function. But the variation of the air gap between magnetic position sensor and the stator and the error in manufacturing process can cause the variation in offset, phase and amplitude of the generated waveforms when the linear motor moves. These variations in sine and cosine waveforms are changed according to the current linear motor position, and it is very difficult to compensate the errors using constant value. In this paper, the generated sine and cosine waveforms from the magnetic position sensor are compensated on-line using the RLSM with forgetting factor. And the speed observer is introduced to reduce the effect of uncompensated harmonic component. The approaches are verified by some simulations and experiments.

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References

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