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How to differentiate between incremental encoder and absolute value encoder?

by:HENGXIANG     2020-12-04
Release date: sensing technology co. , LTD. , zhejiang province _ encoder - 2018 1 - Browse 31 419 encoder to introduce how to distinguish between incremental encoder and absolute value encoder? The primary difference between incremental encoder and absolute value encoder should be after a power outage, such as the incremental encoder, position change after the call, it will not be able to identify a new position after a power outage, such as the absolute value encoder, position change after the call, it identifies a new location from the appearance or nameplate? Incremental encoder and absolute encoder, can through the program modification to transform the encoder system, should be logo on the nameplate, or its measurement control object numerical results, to distinguish. Incremental encoder: by A center has A shaft of light code disc, on which there are circular and dark scribed line, have read photoelectric emission and receiving devices, obtain four groups of sine wave signal is combined into A, B, C, D, 90 degree phase difference (each sine wave Relative to a cycle of 360 degrees) , C, D will signal the reverse, superimposed on A and B two phase, can strengthen stability of signal; Every turn output another Z pulse to represent a zero reference. Because of A, B two phase difference of 90 degrees, but only through A phase in the former or B phase in the former, with forward and inversion of discriminant encoder, through the zero pulse, encoder zero reference can be obtained. Arrangement, so, in every position of encoder, by reading each groove and the dark, get a set of zero power from 2 to the n - 2 The only 2 hexadecimal codes (1 to the power Gray code) , this is called a n a absolute encoder. The encoder is determined by the mechanical position of the light code disc, it is not affected by power outages, interference. Absolute encoder is determined by mechanical position of each position is unique, it does not need memory, don't need to find a reference point, and don't always count, when you need to know, when to go to read it. In this way, the anti-interference characteristics of the encoder, the reliability of data greatly improved. It can be seen from the above description that both have advantages and disadvantages of each, incremental encoder is general, mostly in this occasion. From the price, absolute encoder is much more expensive in general, and the range of absolute encoder has a range, commonly so widely applied on the special needs of machine tools. Sensing technology co. , LTD. , zhejiang province, has more than 20 series over 100 varieties of high quality products: incremental photoelectric encoder, magnetoelectric incremental encoder, photoelectric encoder, absolute type magnetoelectric absolute encoder, etc.
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