Our nomenclature for servos in machine controls is a little different, for example a traditional 3phase servo with a 3phase hall sensor is still called "servo" even if it doesn't have an optical encoder. With this setup you can commutate the motor and get smooth motion and variable speed control but not precise position control. We then add on a optical shaft encoder or a optical linear encoder for position control.
In the video he has what looks like a magnetic absolute encoder, I have honestly never seen that in industrial applications although I have seen "absolute" optical encoders that have a backup battery to store the home point, kind of weird imo.
I was surprised when I first encountered servos with just magnetic hall effect sensors but there are actually lots of applications where you want speed control but not accurate position control.
In the video he has what looks like a magnetic absolute encoder, I have honestly never seen that in industrial applications although I have seen "absolute" optical encoders that have a backup battery to store the home point, kind of weird imo.
I was surprised when I first encountered servos with just magnetic hall effect sensors but there are actually lots of applications where you want speed control but not accurate position control.