Yaskawa SGDB User Manual
Page 241
5.1 Selecting a Σ -Series Servo
231
Machine Data Table
Fill out the machine data table below as an aid to selecting the drive system. When the
machine data table is complete, use the servomotor sizing software to select the motor
capacity.
Ball Screw Horizontal Axis
*1
Load mass
W
kg (lb)
Thrust
F
kg (lb)
Coefficient of friction
µ
Table W
Overall efficiency
η
Table W
Motor
*2
Gear ratio
R (= Nm/Nl)
Motor
Ball screw
*3
Gear+coupling
Jg
kg¡cm
2
(lb¡in
2
.)
Gear+coupling
J
Ball screw
Ball screw pitch
P
mm (in.)
p g
Jg
Ball screw diameter
D
mm (in.)
Ball screw length
L
mm (in.)
Ball Screw Vertical Axis
Load mass
W
1
kg (lb)
Counterweight
W
2
kg (lb)
Coefficient of friction
µ
Motor
Overall efficiency
η
Gear+coupling
Gear ratio
R (= Nm/Nl)
Gear+coupling
Jg
Gear+coupling
Jg
kg¡cm
2
(lb¡in
2
.)
Ball screw pitch
P
mm (in.)
Ball screw diameter
D
mm (in.)
B ll
Ball screw length
L
mm (in.)
Ball screw
Timing Belt
Load mass
W
kg (lb)
Pulley
Jd
Thrust
F
kg (lb)
Jd
Coefficient of friction
µ
Overall efficiency
η
Gear+coupling
Timing belt
Gear ratio
R (= Nm/Nl)
Gear+coupling
Jg
Gear+coupling
Jg
kg¡cm
2
(lb¡in
2
.)
Pulley
Jd
kg¡cm
2
(lb¡in
2
.)
Motor
Pulley diameter
D
mm (in.)
Rack and Pinion
Load mass
W
kg (lb)
W
Thrust
F
kg (lb)
Rack
W
Coefficient of friction
µ
Rack
Overall efficiency
η
Pinion
Gear ratio
R (= Nm/Nl)
Gear+coupling
J
Motor
Gear+coupling
Jg
kg¡cm
2
(lb¡in
2
.)
p g
Jg
Motor
Pinion diameter
D
mm (in.)
Pinion thickness
t
mm (in.)
5