Calibration of the Hall Measurement System for a 6-DOF Precision Stage Using Self-Adaptive Hybrid TLBO.
To determine the planar motion of a 6-DOF precision stage, a measurement system based on three Hall sensors is adopted to obtain the X, Y, Rz motions of the stage. The machining and assembly errors in the actual mechanical system, which are difficult to measure directly, cause the parameters in the model of the Hall measurement system to deviate from their designed values. Additionally, the vertical movement of the stage will render the measurement model nonlinear. To guarantee the accuracy of the measurement, the parameters in the measurement model should be estimated and the nonlinearity compensated. In this paper, a novel approach based on self-adaptive hybrid TLBO (teaching-learning-based-optimization) is proposed to estimate the parameters in the Hall measurement model. The influences of zero deviations and vertical movements on the measurement accuracy are analyzed and compensated. The effectiveness of the proposed method is validated by experimental results obtained on a 6-DOF precision stage. Thanks to parameter estimation and calibration, the measurement error of the Hall sensor array is reduced to 6 micrometers.
Department of Control Science and Engineering, Harbin Institute of Technology, Harbin 150001, China. hitczy@163.com.
Zhenyu
Z
Chen
Department of Control Science and Engineering, Harbin Institute of Technology, Harbin 150001, China. hitlg@hit.edu.cn.|Ultra-Precision Optoelectronic Instrumentation Engineering Centre, Harbin Institute of Technology, Harbin 150001, China. hitlg@hit.edu.cn.
Yang
Y
Liu
Department of Control Science and Engineering, Harbin Institute of Technology, Harbin 150001, China. gaea@hit.edu.cn.
Zhenxian
Z
Fu
Department of Control Science and Engineering, Harbin Institute of Technology, Harbin 150001, China. songshenmin@hit.edu.cn.
Shenmin
S
Song
Ultra-Precision Optoelectronic Instrumentation Engineering Centre, Harbin Institute of Technology, Harbin 150001, China. jbtan@hit.edu.cn.
Jiubin
J
Tan
TLBO algorithm; hall sensor; measurement system modeling; multi-DOF precision stage