Siemens SIMOVERT MASTERDRIVES Manual page 860

06.2005
11.2 Specification of the travel curve
NOTE
Siemens AG 6SE7087-6QX70 (Version AE)
SIMOVERT MASTERDRIVES
The travel curve - namely the v,t diagram when a linear drive is being
used - is determined from the information relating to travel distances,
maximum speed, acceleration, deceleration and the cycle time. If multi-
axis drives are used, the interdependence of the individual travel curves
must be taken into account. The travel curve is needed for deciding on
the thermal rating of the motor and the type of braking resistors. It
should therefore represent a "worst-case scenario" for the particular
type of motor and resistors chosen.
v
Area represents distance s
v
max
t
b
Fig. 11-1 Example of a simple travel curve
♦ Acceleration ( ) time [s]
b
♦ Deceleration ( ) time [s]
v
v
max
a
b,v
♦ Time for constant (
s
tot
♦ Travel time [s]
On rotating drives (turning mechanisms), the values ω
have to be applied instead of v
Compendium Motion Control
tot
t t
k v
t
tot
T
v
= max
t
b
a
b
v
max
=
t
v
a
v
Maximum speed [m/s]
Acceleration, deceleration [m/s
s
tot
) travel [s] =
t
k
k
Travel distance [m]
= +
t t t
tot b k
, a , s
max b,v tot
Engineering Information
t
p
2 ]
t t
b v
− ⋅ − ⋅
v v
max max
2 2
v
max
+
t
v
, α , ϕ
max b,v tot
.
t
11-3