A contribution to the design of fast code converters for position encoders

Denić, Dragan; Dincic, Milan R.; Miljković, Goran; Perić, Zoran

doi:10.1080/00207217.2016.1138521

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2020

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“…One or two code reading heads can be used for pseudorandom code scanning [6], [15], [16], as well as for parallel reading with photodetector array [17]. In the pseudorandom encoder, the read code word needs conversion to a natural code, which is done using different types of converters [7], [18], [19]. Parallel conversion methods are the fastest [7].…”

Section: Introductionmentioning

confidence: 99%

Redundant and Flexible Pseudorandom Optical Rotary Encoder

Miljković

Denić

2020

ELEKTRON ELEKTROTECH

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Optical encoders are mainly used in modern motion servo systems for high-resolution and reliable position and velocity feedback. Pseudorandom optical rotary encoders are single-track and use a serial pseudorandom binary code to measure absolute position. The realization and analysis of such a rotary encoder with advanced code scanning and error detection techniques, as well as an improved redundancy in operation, are presented. A presented serial code reading solution uses two phase-shifted code tracks and two optical encoder modules. So, the realized encoder, hybrid in nature, provides “output on demand” and more or less reliable position information using very efficient error checking. Compared to a standard absolute encoder, this encoder requires a smaller code disc, facilitates installation, has greater flexibility in operation, and is less sensitive to external influences.

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