The encoder can convert the mechanical geometric displacement on the output shaft into pulse or digital quantity. This is the most widely used sensor at present. Since the photoelectric encoder is coaxial with the motor, when the motor rotates, the encoder (grating plate) rotates at the same speed as the motor, reflecting the current speed of the motor. It is mainly composed of four parts: light source, code disc, optical system and circuit. Then we will explain according to different kinds of encoders.

