YASKAWA SGDH, User Manual

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11.1 Servomotor Capacity Selection Examples
11-3
11
• Load moment of inertia at motor shaft
(5) Load Moving Power
(6) Load Acceleration Power
(7) Servomotor Provisional Selection
(a) Selecting Conditions
• T
L
≤
Motor rated torque
• Pa + Po = (1 to 2)
×
Motor rated output
• N
M
≤
Motor rated speed
• J
L
≤
SERVOPACK allowable load moment of inertia
The followings satisfy the conditions.
• SGMGH-09A2A servomotor
• SGDH-10ADG SERVOPACK
(b) Specifications of the Provisionally Selected Servomotor and SERVOPACK
• Rated output: 850 (W)
• Rated motor speed: 1500 (min
-1
)
• Rated torque: 5.39 (N
⋅
m)
• Instantaneous peak torque: 13.8 (N
⋅
m)
• Servomotor moment of inertia: 13.9
×
10
-4
(kg
⋅
m
2
)
• SERVOPACK allowable load moment of inertia: 69.58
×
10
-4
(kg
⋅
m
2
)
(8) Verification on the Provisionally Selected Servomotor
• Required starting torque
• Required braking torque
• Torque efficiency
J = J + J + J = 44.9
×
10 (kg m )
L L1 C B
-4 2
P
O
= = = 272 (W)
2
π
N
M
T
L
60
2
π ×
1500
×
1.73
60
P
a
=
(
N
M
)
2
=
(
×
1500
)
2
= 1108 (W)
2
π
60
2
π
60
J
L
ta
44.9
×
10
-4
0.1
T = + T = + 1.73
60ta 60
×
0.1
2
π
N (J + J )
2
π
×
1500
×
(13.9 + 44.9)
×
10
P
−4
M M L
L
11 (N m) < Instantaneous peak torque Satisfactory
T =
−
T =
−
1.73
60td 60
×
0.1
2
π
N (J + J )
2
π
×
1500
×
(13.9 + 44.9)
×
10
S
−
4
M M L
L
7.5 (N m) < Instantaneous peak torque Satisfactory
T = =
t
Τ
ta + T tc + T td
r m s
P L S
3.72 (N m) < Rated torque Satisfactory
2 2 2
1.5
(11)
×
0.1 + (1.73)
×
1.0 + (7.5)
×
0.1
2 2 2