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APPENDIX
App. 5.9 Selection example
Machine
specification
Servo motor
Servo amplifier
(1) Selection of control parameters
Setting of electronic gear (command pulse multiplication numerator/denominator)
There is the following relation between the electronic gear and command resolution ∆l
P
CMX
B
∆l
=
•
0
P
• n
CDV
f
When the above machining specifications are substituted in the above equation
16
0.001 =
4194304 • 8/5
1
4194304 • 8/5
CMX
=
•
CDV
1000
CMX
Acceptable as CMX/CDV is within 1/10 to 4000
CDV
(2) Servo motor speed
V
1
30000
0
N
= P
•
=
0
1/n
16
B
Feed speed of moving part
Travel distance per command pulse
Feed per cycle
Positioning time
Number of feeds
Operation cycle
Reduction ratio
Moving part mass
Drive system efficiency
Friction coefficient
Gear ratio 5: 8
Ball screw lead
Ball screw diameter
Ball screw length
Gear diameter (servo motor shaft)
Gear diameter (load shaft)
Gear face width
Number of feedback pulses
CMX
•
CDV
262144
=
16
625
8
•
= 3000 [r/min]
5
App. - 23
V
= 30000 [mm/min]
0
∆l
= 0.001 [mm/pulse]
0
l = 400 [mm]
t
= within 1 [s]
0
40 [times/min]
t
= 1.5 [s]
f
1/n = 5/8
W = 60 [kg]
η = 0.8
µ = 0.2
P
= 16 [mm]
B
D
= 20 [mm]
B
L
= 500 [mm]
B
D
= 25 [mm]
G1
D
= 40 [mm]
G2
L
= 10 [mm]
G
P
= 4194304 [pulses/rev]
f
.
0
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