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Absolute encoder accuracy versus resolutionand the meaning of using an absolute encoder


The number of bits of the single-turn absolute encoder represents the number of code channels of the code wheel. Because it is a binary code disk (the same Gray code), its accuracy becomes 2 squares, such as 12 bits, which is 2 The 12th power is also 4096.

In theory, the accuracy of high resolution is high, but in fact it is only the design accuracy, the real precision depends on the manufacturer's production technology level.


However, the same absolute value encoder, there are many technical methods to achieve absolute position feedback and multi-turn detection, and this difference in product principle, the application experience brought to the user is also very different.

We know that in order for the encoder to feed back the absolute position, the uniqueness of the angular position coding within the measurement range must be achieved.


In this sense, photoelectric encoders using (eg, Gray code, BCD code, hexadecimal code...) are capable of outputting without repeating position signals within a rotation range of one revolution, Can be used to read single-turn absolute position feedback.


We know that rotary encoders have incremental and absolute values. Generally, absolute encoders are much more expensive than incremental ones. Absolute encoders are divided into single and multiple coils.


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