Title :
Efficient method for correction and interpolation signal of magnetic encoders
Author :
Tue Le, Hieu ; Van Hoang, Hung ; Jeon, Jae Wook
Author_Institution :
Sch. of Inf. & Commun. Eng., Sungkyunkwan Univ., Suwon
Abstract :
Magnetic encoders are widely used for speed or position measurement. This research presents a suitable method to correct the quadratic signal from a magnetic sensor. A new quadrature all digital phased-locked loop (QADPLL) method is presented. The method minimizes the effect of amplitude imbalance, noise, phase shift, and signal offsets. It also can solve waveform distortion and time-lag problems. Moreover, this paper proposes an interpolation technique to improve the accuracy of position information. By deriving the high-order signal from a sinusoidal signal, a high-resolution position can be obtained from a low-resolution encoder. Simulation and experiment on a linear motor were conducted. The results verify the performance of the proposed methods.
Keywords :
digital phase locked loops; encoding; interpolation; magnetic sensors; position measurement; signal processing; amplitude imbalance; interpolation signal; interpolation technique; linear motor; low-resolution encoder; magnetic encoders; phase shift; position measurements; quadrature all digital phased-locked loop method; signal offsets; speed measurement; time-lag problems; waveform distortion; Costs; Electric shock; Interpolation; Magnetic noise; Noise level; Optical distortion; Optical sensors; Optical variables control; Phase locked loops; Phase noise;
Conference_Titel :
Industrial Informatics, 2008. INDIN 2008. 6th IEEE International Conference on
Conference_Location :
Daejeon
Print_ISBN :
978-1-4244-2170-1
Electronic_ISBN :
1935-4576
DOI :
10.1109/INDIN.2008.4618320