1
05.01
1.3 Engineering a drive
1-32
© Siemens AG 2008 All Rights Reserved
SIMODRIVE 611 Configuration Manual (PJU) – 05/2008 Edition
1.3.2 Dynamic operation
The peak infeed power must also be calculated for acceleration and decelera-
tion operations.
S Feed axes
The peak infeed power expected for feed axes can be roughly calculated
according to the following formula:
P
S
FD
= 0.6 V
DC
link
⋅ I
max
⋅ ñ/n
N
⋅ 10
–3
[kW]
Where:
P
S
FD
peak infeed power (calculated) [kW] for feed axes
0.6 empirical factor: DC link energy and
and EMF of the motor are taken into account
V
DC
link
DC link voltage [V] (600 V)
I
max
peak current [A] set for an axis
ñ/n
N
max. axis speed referred to the
motor rated speed
S Feed axes with linear motors
P
S
FD
= F
MAX
⋅ V
MAX,
FMAX
+ (I
MAX
/I
N
)
2
⋅ P
VN
[kW]
= 0.5 ... 0.9 ⋅ U
ZK
⋅ I
MAX
⋅ v/V
MAX,
FMAX
~
⋅ 10
–3
[kW]
Where:
F
MAX
maximum force [N]
V
MAX,
FMAX
maximum velocity at the maximum force [m/min]
I
max
peak current [A] set for an axis
I
N
rated current [A] set for an axis
P
VN
rated motor power loss [kW]
v/V
MAX,
FMAX
max. axis velocity referred to the maximum velocity at the
maximum force
~
S Main spindles
The peak infeed power expected for main spindles is calculated according
to the following formula:
– Motors v 4 kW
P
S
MSD
= 1.45 ⋅ P
S
motor
shaft
MSD
[kW]
– Motors > 4 kW
P
S
MSD
= 1.25 ⋅ P
S
motor
shaft
MSD
[kW]
Where:
P
S
MSD
peak power (calculated) for main spindles [kW]
1.25 or 1.45 factor to take into account the motor efficiency
P
S
motor
shaft
MSD
peak power [kW] used at the shaft of the
main spindle motor
1 Overview of the Drive S
stem 10.04
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