YASKAWA SGM7J-A5A, Technical Supplement

Page: 596 / 622

Appendices
Capacity Selection for Servo Motors
578
7.
Verification of the Provisionally Selected Servo Motor
• 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 Servo Motor is applicable.
The torque diagram is shown below.
Moment of Inertia ( J
M
)
0.00785 (kg  m
2
)
Allowable Load Moment of Inertia Ratio
(
J
R
)
25
Item Value
TMa
= =
≈ 44.9 (N
x
m) < Maximum instantaneous torque...Satisfactory
(
JL
+
JM
)
×
NO
9.55
×
tpsa
(0.135 + 0.00785)
×
300
9.55
×
0.1
TMd
= - = -
≈ -44.9 (N
x
m) < Maximum instantaneous torque...Satisfactory
(
JL
+
JM
)
×
NO
9.55
×
tpsd
(0.135 + 0.00785)
×
300
9.55
×
0.1
Trms = =
TMa
2
×
tpsa
+
TL
2
×
tc
+
TMd
2
×
tpsd
2
44.9 2
×
0.1 + 0 2
×
0.05 + (-44.9) 2
×
0.1
≈ 14.2 (N
x
m) < Rated torque...Satisfactory
tf
Torque (N
⋅
m)
Time (s)
-44.9
0.05
44.9
0.1 0.1 0.1
2.0