NDLI: An innovative method to increase the resolution of optical encoders in motion servo systems

Content Provider	IEEE Xplore Digital Library
Author	Cheung, N.C.
Copyright Year	1999
Description	Author affiliation: Dept. of Electr. Eng., Hong Kong Polytech., Kowloon, Hong Kong (Cheung, N.C.)
Abstract	Presently, most high performance motion servo systems rely on optical encoders for position and velocity feedback. Optical encoders with higher resolutions will increase the performance and accuracy of these motion systems. One method to increase the resolution of optical encoders without the need to increase their optical resolution is to use sine-cosine interpolation. There are a few existing methods to accomplish this task. However, all of them have limitations or disadvantages. This paper provides a general overview of these existing methods, highlights their features and limitations. Then, a novel and simple method to realise sine-cosine interpolation of optical encoders is proposed. The proposed method can be implemented by using very few logic gates and comparators. Construction of a 16 times interpolation circuit show that the proposed interpolation circuit can be built with very few components, and its accuracy will not decrease when the travelling speed of the encoder is increased.
Starting Page	797
Ending Page	802
File Size	541440
Page Count	6
File Format	PDF
ISBN	0780357698
DOI	10.1109/PEDS.1999.792808
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1999-07-27
Publisher Place	Hong Kong
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Servomechanisms Optical feedback Interpolation Signal resolution Optical filters Decoding Optical pulses Pulse circuits Motion control Space vector pulse width modulation
Content Type	Text
Resource Type	Article

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