Siemens SIMOVERT MASTERDRIVES Manual page 886

06.2005
Siemens AG 6SE7087-6QX70 (Version AE)
SIMOVERT MASTERDRIVES
M/Nm
60
50
40
M
Mot max
30
20
10
0
500
Fig. 11-14 Dynamic limit curve for the 1FT6084-8AF7 with the points of the load
cycle
As a check on the thermal limits, the effective motor torque is
calculated. This is done by determining all the motor torques within the
travel curve in addition to the motor torque during acceleration.
♦ Motor torque during constant travel
= ⋅
M M
Mot k W
⋅ η
i
mech
♦ Motor torque during deceleration
= − −
M M M
Mot v v Mot v G
= − − + −
5 94 0 914 . . (
Here, the proportion of deceleration torque outweighs the resistance
torque. Regenerative operation occurs. In this case, the efficiency
levels are above the line (the sign before the bracketed term
"-M +M " is negative).
v load W
The torque characteristic can be determined using the values
calculated for the motor torque.
Compendium Motion Control
1000 1500
1 1
= ⋅
27 47 .
⋅ η ⋅
10 0 9 095 .
G
+ − + ⋅
( M M )
v Load W
⋅ η
i (
⋅
0 9 0 95 . .
+ ⋅
179 2 27 47 . . )
10
Engineering Information
2000 2500 3000
n
n/min
Mot max
=
3 21 . Nm
⋅
1
− +
sign ( M M
⋅ η
) v load
mech
G
= −
19 83 . Nm
11-29
-1
)
W