Chapter 1 Overview of the RSF supermini series
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13
1-8 Detector resolution
An encoder with 500 pulses per rotation is incorporated in the motor unit of the RSF supermini series
actuators, and the motor output is decelerated by 1/30, 1/50, or 1/100 by the precision control
decelerator Harmonic Drive™. Therefore, the resolution per one rotation of the actuator output shaft is
30, 50, or 100 times of the actual encoder resolution. In addition, the encoder signal is electrically
multiplied by 4.
The following table shows the resolution at the output shaft for different gear ratios.
Model
RSF-3C
RSF-5B
Gear ratio
Item
30
50
100
30
50
100
Detector resolution
(when multiplied by 4)
Pulse/Rotation
24,000
40,000
80,000
60,000
100,000
200,000
Angle per one pulse
Angle second
(arc sec)
54
32.4
16.2
21.6
12.96
6.48
1-9 Mechanical accuracy
The machining accuracy of the output flange and the mounting flange of RSF supermini actuators are
indicated in the table below.
RSF
‐
3C
RSF
‐
5B
Machined accuracy of the output flange
* T.I.R.
unit: mm
Symbol
Machined parts
Accuracy value
Model
RSF
‐
3C
RSF
‐
5B
a
Runout of the tip of the output shaft
0.03
0.03
b
Concentricity of installed spigot joint
0.02
0.04
c
Squareness of installation surface
0.02
0.02
d
Output flange surface contact
0.005
0.005
e
Parallelism of installation surface and
output flange
0.015
0.015
*) T.I.R(Total Indicator Reading): Indicates the total amount of dial gage reading when the measurement unit is
rotated once.
