11.1 Servomotor Capacity Selection Examples
11-3
(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.
• SGMAH-08A Servomotor
• SGDS-08A SERVOPACK
(b) Specifications of the Provisionally Selected Servomotor and SERVOPACK
• Rated output: 750 (W)
• Rated motor speed: 3000 (RPM)
• Rated torque: 2.39 (N⋅m)
• Instantaneous peak torque: 7.16 (N⋅m)
• Servomotor moment of inertia: 2.10 × 10
-4
(kg⋅m
2
)
• SERVOPACK allowable load moment of inertia: 31.5 × 10
-4
(kg⋅m
2
)
(8) Verification on the Provisionally Selected Servomotor
• Required starting torque
• Required braking torque
• Torque efficiency
P
O
= = = 163 (W)
2πN
M
T
L
60
2π × 1500 × 1.04
60
P
a
=
(
N
M
)
2
=
(
× 1500
)
2
= 454 (W)
2π
60
2π
60
J
L
ta
18.4 × 10
-4
0.1
T = + T = + 1.04
60ta 60 × 0.1
2
πN (J + J )
2
π × 1500 × (2.10 + 18.4) × 10
P
−4
MM L
L
4.3 (Nm) < Instantaneous peak torqueSatisfactory
T = − T = − 1.04
60td 60 × 0.1
2
πN (J + J )
2
π × 1500 × (2.10 + 18.4) × 10
S
−4
MM L
L
2.2 (Nm) < Instantaneous peak torqueSatisfactory
T = =
t
Τ ta + T tc + T td
r m s
PLS
1.51(Nm) < Rated torqueSatisfactory
222
1.5
(4.3) × 0.1 + (1.04) × 1.0 + (2.2) × 0.1
222
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