Harmonic Drive RSF supermini Series User Manual

1-7 One-way positioning accuracy
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Overview of the RSF supermini series
1-7 One-way positioning accuracy
The following table shows the “one-way positioning accuracy."
The
The “one-way positional accuracy” represents the maximum difference in a single revolution
among differences between an angle actually rotated from the datum position and one that is
supposed to turn in each position by repeating sequential positioning in a preset rotational direction.
The RSF supermini series contains a HarmonicDrive® speed reducer for precision control and
positioning errors of the motor shaft are therefore compressed to 30:1, 50:1 or 100:1 by speed
reduction. In reality, angular transmission errors of the speed reducer determine the one-way
positional accuracy. The measured values of angular transmission errors of the speed reducer are
therefore shown as the one-way positional accuracy of the RSF supermini series.
The accuracy for each gear ratio is shown below.
Model RSF-3C RSF-5B
Gear ratio
Item
30 50 100 30 50 100
One-
way positioning
accuracy
arc min 10 4 3 3
rad
2.9×10
-3
1.20×10
-3
0.87×10
-3
0.87×10
-3
Reference
(Accuracy display and measurement method
according to JIS B 6201: 1987)
 One-way positioning of rotation shaft motion
First, perform positioning at any one position in a fixed
direction. This position is the reference position. Next,
perform positioning in succession in the same
direction, and measure the difference between the
angle actually rotated from the reference position and
the desired angle at each position. The maximum
difference in one rotation among these values is taken
as the measurement value. Measurement of
equipment with the continuous positioning function for
rotational motion shall be done once per 30 degrees
or 12 positions throughout the entire rotation range as
a rule.

Harmonic Drive RSF supermini Series Specifications

General

Brand	Harmonic Drive
Model	RSF supermini Series
Category	Controller
Language	English