NDLI: A new approach based-on advanced adaptive digital PLL for improving the resolution and accuracy of magnetic encoders

Content Provider	IEEE Xplore Digital Library
Author	Hung Van Hoang Hieu Tue Le Jae Wook Jeon
Copyright Year	2008
Description	Author affiliation: Sch. of Inf. & Commun. Eng., Sungkyunkwan Univ., Suwon (Hung Van Hoang; Hieu Tue Le; Jae Wook Jeon)
Abstract	Position sensors using magnetic effects, such as magnetic encoders (MEs), are increasingly used in many industrial applications. These include motor control, electro-mechanical braking systems, and precision measurement systems. The magnetic encoders generally provide a pair of sinusoidal signals dephasing 90deg to each other. Unfortunately, the signals obtained are not ideal, in that they always exist with the DC offsets, different amplitudes, phase-shifts and waveform distortions. These are further compromised by noise and changes in operating conditions. This paper proposes an approach for real-time correcting and tracking ME signals based on the Advanced Adaptive Digital Phase-Locked Loop (AADPLL) technique. AADPLL provides a robust filtering characteristic as well as a wideband of input frequency. It can effectively filter noise and improve the accuracy of ME signals. AADPLL also takes advantage of tracking high-speed input signals without time-lag, unlike traditional filters. A quadrature pulse interpolator is introduced to obtain high resolution. This interpolator uses look-up tables (LUTs) to store pulse-out values in one period of MEs signals. These LUTs are reduced in size for easy implementation in Digital Signal Processor (DSP) hardware platforms. Experimental results demonstrate the effectiveness of the proposed method.
Starting Page	3318
Ending Page	3323
File Size	1398342
Page Count	6
File Format	PDF
ISBN	9781424420575
DOI	10.1109/IROS.2008.4651111
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2008-09-22
Publisher Place	France
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Phase locked loops Noise Signal resolution Digital signal processing Table lookup Voltage-controlled oscillators Filtering
Content Type	Text
Resource Type	Article

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