Importance

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Abstract

In a method for determining the absolute position (φ) of a carrier (4) for scale marks (6) of an incremental encoder (2) with respect to a sensor array (12), having segment lengths (L0, L1, L2, . . . ) differing by pairs between the scale marks (6), measuring signals (x,y) are generated with the sensor array (12), a theoretical phase shift (Δαt) of ideal measuring signals (xi, yi) is determined for each scale segment (10), model signals (xm,ym) are generated on the basis of parameters (P1, P2, . . . ), which model the measuring signals (x,y), the model signals (xm,ym) are adapted to the measuring signals (x,y), the instantaneous model phase shift (Δαm) between the model signals (xm,ym) is determined, the suitable theoretical phase shift (Δαt) with the associated instantaneous scale segment (10) is selected, the absolute position (φ) is determined from the position of the instantaneous scale segment and a relative position (φ_rel) is determined from the instantaneous phase position (αm) of the model signals (xm, ym) within the instantaneous scale segment.

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