3.1 Servomotors
3-5
3
Specifications and Dimensional Drawings
(5) Load Moment of Inertia
The larger the load moment of inertia, the worse the movement response.
The allowable load moment of inertia (
J
L
) depends on the motor capacity, as shown above. This value is pro-
vided strictly as a guideline and results may vary depending on servomotor drive conditions.
Use the AC servo drive capacity selection program SigmaJu to check the operation conditions.
The program can be downloaded for free from our web site (http://www.e-mechatronics.com/).
An overvoltage alarm (A.400) is likely to occur during deceleration if the load moment of inertia exceeds the
allowable load moment of inertia. Take one of the following steps if this occurs.
• Reduce the torque limit.
• Reduce the deceleration rate.
• Reduce the maximum speed.
(6) Allowable Radial and Thrust Loads
Design the mechanical system so thrust and radial loads applied to the servomotor shaft end during operation
fall within the ranges shown in the table.
Servomotor Model
Allowable
Radial Load
(Fr) [N]
Allowable
Thrust Load
(Fs) [N]
LF
[mm]
Reference Diagram
SGMMV–
B3
8
4
10
B5
8
4
10
B9
10
4
10
A1
34
14.5
16
A2
44
14.5
16
A3
44
14.5
16
Fr
Fs
LF
