Linear feedback sample

An absolute feedback system with a resolution of 5 nm is used together with a linear motor with a 24-mm pole pitch (see technical data for the linear motors). This results in 4.8 million increments per electrical revolution** (24 mm / 5 nm). In order to measure this, Position Resolution must be set to at least 23 bits (8.3 million increments). The maximum explicit travel range is thus reduced to 9 multi-turn bits (S_max = 2⁹ x 24 mm = 12288 mm).

**An electrical revolution is defined in the case of a linear motor by the pole pair distance of the individual magnets. This electrical revolution is schematically illustrated in the picture above. For further information we recommend that you read the section “Commutation method”.