Incremental encoder！

Incremental encoder is the direct use of photoelectric conversion principle output three sets of square wave pulse A, B and Z phase; A, B two groups of pulse phase difference of 90 degrees, Z phase for each pulse, for the reference point positioning. Its advantages are simple structure, mechanical average life can be more than tens of thousands of hours, anti-interference ability, high reliability, suitable for long-distance transmission. The disadvantage is that the absolute position encoder information of the shaft rotation can not be output.

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