Encoders have different classification methods, let's summarize and understand them below.

1. According to the different ways of engraving holes on the code wheel, it can be divided into:
(1) Incremental type: It emits a pulse signal (also known as sine and cosine signals, which are then subdivided and chopped into higher frequency pulses) every unit angle turned. It is usually output in phases A, B, and Z, with phases A and B being delayed by 1/4 cycle each other. According to the delay relationship, forward and reverse can be distinguished, and the rising and falling edges of phases A and B can be multiplied by 2 or 4 times; The Z-phase is a single cycle pulse, which means one pulse is emitted per cycle.
(2) Value type: It corresponds to a circle, and each reference angle emits a binary value of * corresponding to that angle. Multiple positions can be recorded and measured through external loop devices.

2. According to the output type of the signal, it can be divided into voltage output, open collector output, push-pull complementary output, and long line drive output.

3. Classified by mechanical installation form of encoder
(1) Axial type: Axial type can be divided into clamping flange type, synchronous flange type, servo installation type, etc.
(2) Shaft sleeve type: Shaft sleeve types can be divided into semi empty, fully empty, and large-diameter types.

4. According to the working principle of encoders, they can be divided into photoelectric, magneto electric, and contact brush types.