Technical data
Version: 1.0 ───
29XPlanar
4
4.1
Definition
The following sections contain definitions of terms, boundary condi-
tions, operating data and technical data.
4.2
Boundary conditions
All data are based on 24 °C ambient temperature and constant tile
and mover temperature. The data can have a tolerance of +/- 10%.
Deviations between individual movers are possible.
4.2.1Technical terms
Absolute accuracy [mm or mrad]
Specification of the difference between an expected set position and
the mean value of the actual position resulting from approaching the
set position from different directions (multi-directional). The absolute
accuracy is valid within a tile and is defined as the difference be-
tween the set position and the actual position of the positioning sys-
tem.
Standstill repeatability [mm or mrad]
Specification of how accurately the system positions when ap-
proaching a position from the two directions (bidirectionally). The
standstill repeatability is to be evaluated as the average difference
between the actual position and the set position and is the most im-
portant measure for the assessment of a positioning system. It de-
fines the variance around the mean value of the actual positions for
a large number of positionings.
The variance of the positions is illustrated by the Gauss distribution
or normal distribution. The standstill repeatability is defined by three
standard deviations (3σ) with a probability of 99.74%.
Synchronization accuracy [mm or mrad]
Specification of the fluctuations that the system exhibits in the posi-
tion during a position-controlled movement at a constant set velocity
of 200 mm/s. The synchronization accuracy depends on the load on
the movers and the associated inertias in all 6 spatial directions, the
controller settings, the target velocity and also any mechanical mis-
alignment between the tiles.
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