Absolute encoders detect rotational or angular movements and convert them into electrical signals. They are also known, among other things, as rotary absolute pulse encoders, rotary absolute encoders or absolute encoders. Unlike incremental encoders, with absolute encoders the current position value is always available. If the encoder is moved mechanically while in the switched-off state, the current position can be read out immediately and directly after switching the voltage supply back on again.
With absolute encoders, a distinction is made between single- and multiturn encoders.
Single turn encoders
These rotary encoders break down a revolution of the output shaft into measurement steps. The output measurement value is thereby repeated on each revolution.
In addition to the angular positions per revolution, these also detect multiple revolutions. With multiturn encoders, the measurement value thus consist of the angular position and the number of revolutions. Depending on the technology, multiturn encoders require a backup battery to guarantee the temporary storage of the multiturn functionality.
The position data are usually queried via standard interfaces, such as an SSI interface with BiSS-C protocol. Differential signal inputs/outputs in the form of line drivers are also used. This balanced interface suppresses common-mode interference, thereby making longer supply lines possible.
Matched to the respective series of FAULHABER drives, an extensive line of high-quality single- or multiturn absolute encoders with a single-turn resolution of up to 12 bit and a multiturn resolution of up to 16 bit is available.