YASKAWA VS-626M5, Instruction Manual, Page: 288 / 305

Appendix
15.3.2 Acceleration/deceleration Capacity
1 5 -16
J
Calculation Conditions
Table 1 5 . 5 Calculation Conditions
Item Value
Acceleration Time
2.5 s (0 to 6,000 min
− 1
)
0.5 s (0 to 1,500 min
− 1
)
Inertial Moment J
M
0.13 kg
S
m
2
Load: 0.10 kg
S
m
2
Motor: 0.03 kg
S
m
2
(assuming load to be x 0.3)
Output Characteristics (30 min. Rating)
Basic low speed N
B
: 1,500 min
− 1
(kW)
0
0
1500 6000
(min
− 1
)
Max. output (120%)
30 min. rating
Output
Maximum Output During Acceleration/de-
celeration
120% of 30 min. rated output
J
Calculations
In the example shown in Table 15.5, as a result of performing the calculations, the motive force required
from the acceleration/deceleration time is as follows: Upper formula: 30 min. rated 7.5 kW (47.7 N
S
m);
Lower formula: 15 kW (95.0 N ⋅ m).
D
At 0 to 1,500 min
− 1
P
M
=

2
π
60

2
0.13
×
1500
2
1000
×
0.5
=
6.41
(kW)
D
At 0 to 6,000 min
− 1
P
M
=

2
π
60

2
0.13
×
(6000
2 +
1500
2
)
2000
×
2.5
=
10.89
(kW)
15