Selection Examples - Siemens SINAMICS V90 Operating Instructions Manual

Appendix
A.4 Motor selection
A.4.3

Selection examples

This section uses a ball screw mechanism as an example to illustrate the motor selection
procedure.
Exemplary data
The following table lists the data related to the ball screw mechanism and operation pattern.
Workpiece weight
Material density of the ball screw
Ball screw length
Ball screw diameter
Ball screw pitch
Mechanical efficiency
Coupler inertia (refer to the supplier's product catalog)
Acceleration time
Constant motion time
Deceleration time
Cycle time
Travel distance
Gravitational acceleration
Frictional coefficient
Calculating velocity:
Maximum travelling velocity:
Calculating forces, pitch angle and friction angle
Frictional force:
Accelerating force/decelerating force:
Pitch angle of the ball screw:
352
W 40 kg
ρ 7.9 × 10
B 2 m
l
B 0.04 m
d
B 0.04 m
p
B 0.9
ŋ
J 20 × 10
c
t 0.15 s
a
t 0.7 s
u
t 0.15 s
d
t 2 s
c
L 0.5 m
g 9.81 m/s
μ 0.025
SINAMICS V90, SIMOTICS S-1FL6
Operating Instructions, 04/2020, A5E37208830-008
kg/m
3 3
kgm
-6 2
2