A Novel Interpolation method for Quadrature Encoder
Yong Liu, HAO Shang-hui, HAO Ming-hui, Li De · Proceedings of International Conference on Leading Edge Manufacturing in 21st century LEM21 · 2007
A novel signal processing method based on calibration is present in this paper to improve the resolution of quadrature encoder. A radial magnetizing ring alnico is adhered to rotor of motor, while six Hall ICs are placed around the alnico evenly. magnetic filed produced by the alnico can be sensed. Quadrature encoder is calibrated previously to get the table using a higher resolution optical encoder off-line. A quadrature encoder is designed and its resolution can achieve to 13-bits. Structure is very simple and cost is very low compare with an optical encoder. It can be used in unfavorable environment where a high-accuracy position detecting must be realized.