1-7 Uni-directional positional accuracy
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Uni-directional positional accuracy
The uni-directional positional accuracy means the maximum positional difference between the actual
rotated angle from the datum position and its theoretical rotational angle in 1 revolution when series of
positionings are performed in the same rotation direction.
(refer to JIS B-6201-1987.)
FHA-C mini series actuators house speed reducer HarmonicDrive
®
for precision control, so the
positioning error of the motor shaft is compressed to 1/30, 1/50 or 1/100 by the gearing. The actual
angle transmission error of the speed reducer determines the uni-directional positional accuracy.
Therefore, the measurement value of the angle transmission error of the speed reducer is expressed
as the uni-directional positioning accuracy of the FHA-C mini series.
The uni-directional positional accuracy is shown in the table below:
Model
Item
FHA-8C
FHA-11C
FHA-14C
30
50
100
30
50
100
30
50
100
Uni-directional
positional accuracy
Sec.
150
120
120
120
90
90
120
90
90
Datum position
Actual stop position
Theoretical stop position
Positioning error
