Why does the encoder need battery power？

The encoder you are referring to that requires a battery is an absolute encoder, because it needs to record the absolute position, that is, the number of revolutions, so the battery needs to save the data. The pulse processor main board is processed by the encoder feedback signal and sent to the upper computer in one way. Its work requires external power supply. After the equipment is powered off, if the motor shaft is moved for other reasons, at this time, the pulse processor main board The power supply needed to memorize the position comes from the battery, the position signal is still confirmed, and there is no need to reset the next power-on. After removing the battery, the location information cannot be guaranteed.

At the same time, it should be noted that to record the absolute position of the motor requires two elements: 1. The angle of rotation. 2. The number of turns. Absolute encoder with mechanical memory of the number of turns (no battery required) and non-mechanical type (the one you currently use depends on battery memory of the number of turns)