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8-2
Determination of Appropriate Power Supply Units
Average speed without accel
and decel time
Average speed with accel and
decel times
If the duration over which the drive is operated at constant speed is
considerably greater than the accel and decel time, then it applies:
n
av
n
:
average motor speed [min
av
n
... n
: motor speed [min
1
n
t
... t
:
ON time [s]
1
n
Fig. 8-2:
Average speed; influence of accel and decel time is not taken into
consideration
n 1
n 2
n 3
t 1
t 2
Abb. 8-3:
Speed cycle; influence of accel and decel time is not taken into
consideration
Accel and decel times with short cycle times must be taken into
consideration in such dynamic applications as is the case with rollers and
nibble machines:
n
n
:
average motor speed [min
av
n:
motor speed [min
t:
time [s]
t
:
accel time [s]
H
t
:
decel time [s]
B
Fig. 8-4:
Average speed; influence of accel and decel time is taken into
consideration
n
t H
t 1
Abb. 8-5:
Average speed; influence of accel and decel time is taken into
consideration
+
+
+
n
t *
n
t *
...
n
=
1
1
2
2
+
+
t
t
...
t
1
2
n
-1
]
-1
]
t 3
t 4
n
n
+
+
t *
n
t *
t *
H
1
2
2
=
av
+
+
+
t
t
t
t
H
1
B
2
-1
]
-1
]
t B
t 2
DOK-INDRV*-HMV-*******-PR01-EN-P
Rexroth IndraDrive
t *
n
n
t
DGoE.fh7
B
t
DGmE.fh7
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