Engineering Information 06.2005
6SE7087-6QX70 (Version AE) Siemens AG
11-4 Compendium Motion Control SIMOVERT MASTERDRIVES
11.3 Calculation of the maximum speed under load and the
maximum load torque, selection of the gear
Information on the mechanical factors involved is used to calculate the
maximum speed under load and the maximum load torque. The
following specifies the calculation formulae for simple drive tasks:
m
v, a
Guide
Motor
Gear Toothed belt
M
n
load
load
D
Fig. 11-2 Horizontal travel drive
♦ Speed under load [rpm]
n
v
pD
load
=
⋅
⋅
60
v Travel speed [m/s]
D Diameter of load wheel/pinion [m]
♦ Travel resistance / frictional force [N]
Fmgw
WF
=⋅⋅
w
F
specific travel resistance
♦ Resistance/frictional torque [Nm]
MF
D
WW
=⋅
2
♦ Angular acceleration and deceleration at the load wheel/pinion [s
-2
]
α
b load b
a
D
,v ,v
=⋅
2
a
b,v
Acceleration, deceleration [m/s
2
]
♦ Load inertia [kgm
2
]
Jm
D
load
=⋅
⎛
⎝
⎜
⎞
⎠
⎟
2
2
Horizontal travel
drive
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