Innovative method to increase the resolution of optical encoders in motion servo systems

Chow Norbert Cheung

Research output: Chapter in book / Conference proceedingConference article published in proceeding or bookAcademic researchpeer-review

19 Citations (Scopus)

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, highlight 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 build with very few components, and its accuracy will not decrease when the travelling speed of the encoder is increased.
Original languageEnglish
Title of host publicationProceedings of the International Conference on Power Electronics and Drive Systems
PublisherIEEE
Pages797-802
Number of pages6
Publication statusPublished - 1 Dec 1999
EventProceedings of the 1999 3rd IEEE International Conference on Power Electronics and Drive Systems (PEDS'99) - Kowloon, Hong Kong
Duration: 27 Jul 199929 Jul 1999

Conference

ConferenceProceedings of the 1999 3rd IEEE International Conference on Power Electronics and Drive Systems (PEDS'99)
CountryHong Kong
CityKowloon
Period27/07/9929/07/99

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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