YASKAWA SGM7D - Page 39

2.1 Selecting the Servomotor Capacity
2-3
2
Capacity Selection
The following Servomotor meets the selection conditions.
• SGMCV-17CEA11
 Specifications of the Provisionally Selected Servomotor
7. Verification of the Provisionally Selected Servomotor
• Verification of required acceleration torque:
• Verification of required deceleration torque:
• Verification of effective torque value:
t
c
=Time of constant motor speed = t
0
– t
s
– t
psa
– t
psd
8. Result
It has been verified that the provisionally selected Servomotor is applicable.
The torque diagram is shown below.
Item Value
Rated Torque 17 (Nm)
Instantaneous Maximum Torque 51 (Nm)
Moment of Inertia (J
M
)
0.00785 (kgm
2
)
Allowable Load Moment of Inertia Ratio (J
R
)
25
T
Ma
= =
≈ 44.9 (Nxm) < Maximum instantaneous torque...Satisfactory
(
J
L
+
J
M
) ×
N
O
9.55 ×
t
psa
(0.135 + 0.00785) × 300
9.55 × 0.1
T
Md
= - = -
≈ -44.9 (Nxm) < Maximum instantaneous torque...Satisfactory
(
J
L
+
J
M
) ×
N
O
9.55 ×
t
psd
(0.135 + 0.00785) × 300
9.55 × 0.1
Trms = =
T
Ma
2
×
t
psa
+
T
L
2
×
t
c
+
T
Md
2
×
t
psd
2
44.9
2
× 0.1 + 0
2
× 0.05 + (-44.9)
2
× 0.1
≈ 14.2 (Nxm) < Rated torque...Satisfactory
tf
Torque (N⋅m)
Time (s)
-44.9
0.05
44.9
0.1
0.1 0.1
2.0