YASKAWA SGLFW, User Manual

Page: 400 / 447

12 Appendix
12-2
12.1 Linear Servomotor Capacity Selection Examples
(1) Speed Diagram
(2) Force Under Constant Load
(3) Force at Load Acceleration
(4) Linear Servomotor Provisional Selection
(a) Selecting Conditions
(b) Specifications of the Provisionally Selected Linear Servomotor and SERVOPACK
• Rated output: 400 (W)
• Rated speed: 1500 (mm/s)
• Rated force: 147 (N)
• Instantaneous peak force: 440 (N)
• Linear servomotor coil assembly mass:
W
M
= 0.82 (kg)
•
Load speed:
L
=120 m/min
• Workpiece mass: W
W
= 1 kg
•
Table mass: W
T
= 2 kg
• Feeding times: n = 120 times/min
•
Feeding distance: = 0.76 m
• Feeding time:
t
m
= 0.4 s max.
•
Acceleration time:
t
a
= 0.02 s
• Friction coefficiency: = 0.2
µ
υ
t
c
t
a
t
d
(m/min)
Speed
Time (s)
60
0.4
t
L
n
15
t = = =0.5 (s)
tc = 0.4
−
(0.02
×
2) = 0.36 (s)
where t
a
=
t
d
60
120
υ
F
L
= 9.8
µ
( W
W
+ W
T
) = 9.8
×
0.2
×
(1+2) = 5.88 (N)
F
P
= ( W
M
+ W
T
) + F
L
= (1+2)
×
+ 5.88 = 305.88 (N)
60 t
a
L
υ
60
×
0.02
120
F
P
≤
Linear servomotor maximum force
The following models satisfy the conditions.
SGLGW-60A253BP linear servomotor coil assembly
SGDH-04AE SERVOPACK