11.1 Terminology and Data for Servomotors with Gears
11.1.1 Terminology for Servomotors with Low-backlash Gears
11-2
11.1
Terminology and Data for Servomotors with Gears
11.1.1
Terminology for Servomotors with Low-backlash Gears
Refer to the following graph for lost motion and torsion rigidity.
11.1.2
Noise Data
The following noise data for Servomotors with Gears is only for reference. The data may vary
slightly depending on the capacity and gear ratio of the Servomotor.
Measurement Conditions
•
Scale A: 50 cm
•
Ground noise: 28 dB
Item
Measurement Method and Definition
Typical Value for
Low-Backlash Gear
Rated Torque
(N
m)
The rated output torque of the Servomotor is the
input torque to the gear. The rated torque is this value
multiplied by the inverse of the gear ratio and effi-
ciency.
–
Lost Motion
(arc-min)
The difference in the torsion angle with a
±
5% rated
torque load (maximum value at any four positions
during output).
3 max.
Torsion Rigidity
(arc-min)
Higher torsion angle value on one side with a
±
rated
torque load.
10 max.
Angle Transmission
Deviation Accuracy
(arc-min)
The difference between the absolute accuracy and
the accuracy for one rotation under no-load condi-
tions during output.
6 max.
Rated torque
Torsion rigidity
Torsion rigidity
±
5% rated torque
Rated torque
Lost motion
Positive
torque
Negative
torque
Torsion angle
1000
2000
3000
4000
50
100
Input speed (min
-1
)
Initial noise level (dB)
