Optical incremental encoder and absolute encoder！

(1) Incremental: is the angle per unit turned on the issue of a pulse signal (also made positive cosine signal, 

Then be broken down, chopping higher frequency pulse), usually A-phase, B-phase, Z phase output, A-phase, B-phase pulse output 1/4 mutual delay period, the delay can be distinguished relations rotating, and by taking the a-phase, B-phase rising and falling edges can be 2 or 4-fold; Z phase lap pulses per revolution emit a pulse. 

(2) Absolute: is the corresponding circle, each emit a unique reference angle and the angle corresponding to the binary value via external devices can be recorded lap record and measure multiple locations. 

2, according to the type of output signal is divided into: the voltage output, open collector output, a complementary push-pull outputs and long-term drive output. 

3, the encoder mechanical mounting form classification 

(1) a shaft type: shaft clamping flange type can be divided into synchronous and servo flange installation type. 

(2) sleeve type: sleeve type can be divided into the air, fully air-type large-caliber and type.

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