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.
(angle)
150
120
120
120
90
90
120
90
90
Angle correction function during horizontal indexing
The FHA-C mini series driver provides an angle compensation function. This function analyzes the
angle transmission error of the HarmonicDrive
®
beforehand and compensates for this erroneous
difference to improve uni-directional positioning accuracy. The function improves the value of the
uni-directional positional accuracy by 30% or more. For large fluctuant loads, check that the function is
effective before applying it. (Refer to the driver manual on how to use this function.)
Datum position
Actual stop position
Theoretical stop position
Positioning error
Содержание FHA-Cmini Series
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