Encoder Response Frequency & Core Differences

What is the response frequency of an encoder?

The response frequency is the number of pulses output by the encoder per unit time, with the unit being HZ. The maximum electrical response revolutions (r/min)= maximum response frequency/single-turn resolution *60

Therefore, when the encoder's rotational speed exceeds the electrical maximum response speed, it will be unable to keep up with the electrical signal. At the same time, due to the limitations of the bearings, the mechanical speed of the encoder is usually less than the maximum electrical response speed.

What is the most fundamental difference between incremental encoders and absolute encoders?

The fundamental difference lies in whether location information is lost after a power outage. Incremental power-off is forgotten immediately, and it needs to return to zero upon power-on. Absolute power-off memory, knowing the current position immediately upon power-on. For instance, when a robot arm is powered off and then repowered, the joint of an absolute encoder immediately knows its posture, while with an incremental encoder, it needs to perform the "return to zero" action again to accurately locate the reference point.