Measurement Accuracy of Photoelectric Encoder！

The accuracy of the encoder depends on the minimum angle it can distinguish, which is related to the number of fringes in the circumference of the encoder, ie the resolution angle α = 360 ° / slit number. If the number of fringes is 1024, the resolution angle α = 360 ° / 1024 = 0.352 °. The output signals A and B of the photoelectric encoder are differential signals. The differential signal greatly improves the anti-interference ability of the transmission. In the numerical control system, often the signal frequency processing, in order to further improve the resolution. For example, the configuration of the 2000 pulse / r photoelectric encoder servo motor directly drive 8mm pitch ball screw, the CNC system 4 times the frequency processing, equivalent to 8000 pulse / r angular resolution, the corresponding table linear resolution from 0.004mm before frequency doubling to 0.001mrn. The advantage of the photoelectric encoder is no contact wear, long code disk life, allowing high speed, and the width of the outer ring can be done per piece is small, and thus high accuracy. Drawback is the complexity of the structure, the price is relatively high, light source life is short.

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