1. According to the working principle of different ways
(1) incremental type: that is, every turn of the unit angle to send a pulse signal (there are positive and cosine signal, and then its subdivision, chopping out the frequency of the higher pulse), usually A phase, B phase , Phase Z output, A phase, B phase is delayed by 1/4 cycle pulse output, according to the delay relationship can distinguish between positive and negative, and by taking A phase, B phase rise and fall can be 2 or 4 times ; Z phase is a single circle pulse, that is, a pulse per lap.
(2) absolute value type: that is, a circle, each reference angle issued a unique binary value corresponding to the angle, through the external circle device can be a number of locations of the record and measurement.
2. According to the different ways to read: contact and non-contact.
3. According to the signal output type is divided into: voltage output, open collector output, push and pull complementary output and long-term drive output.
4. Classification in the form of encoder mechanical installation
(1) Shaft type: a shaft type can be divided into clamping flange type, synchronous flange type and servo installation type.
(2) Shaft type: Shaft sleeve type can be divided into half-empty, full-space and large diameter and so on.
5. The working principle of the encoder can be divided into: photoelectric, magnetic and contact brush type encoder.
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