Incremental hollow shaft encoder installed more flexible. The motor shaft is directly inserted into the hollow shaft of the encoder and fixed or locked by the elastic piece, which not only saves space, but also does not need to add other accessories when installing. This product also has shock absorption effect, ensures coaxiality, and is used in a large amount of precision and space situations. The hollow shaft encoder is also called blind hole encoder. It is installed in a similar way to the end hollow shaft encoder. It also has the advantages of high concentricity and space saving. The design of the hollow shaft is higher than that of the end hollow shaft encoder.