Calculation Of The Required Dc Link Power (Pzk) For Dimensioning The Supply System, Infeed Unit - Siemens 6SN1123-1AA00-0DA2 Configuration Manual

02.07
05.01
1.3.1 Calculation of the required DC link power (P
the supply system, infeed unit
Steady–state operation:
P
P
S
S
The DC link power P
sheet. The following factors must be taken into account:
S
S
If the exact values of the speed ratio ñ/n
for the application in question, these should be used.
S
The rated motor current may not exceed the rated output current of the
power modules. The maximum motor current must always be less than the
maximum converter current.
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SIMODRIVE 611 Configuration Manual (PJU) – 02/2012 Edition
= P + P
ZK VSA ZK MSD ZK
v Pn
ZK infeed module
Feed axes with rotary motors
The following formula is used in the engineering sheet to determine the cal-
culated power:
= 0.105 ⋅ M ⋅ n ⋅ 10
P
calc FD 0 n
Where:
P calculated power for feed axes [kW]
calc FD
factor 2 ⋅ π/60
0.105
For feed axes, calculated with M
M stall torque [Nm]
0
n rated speed [RPM]
n
Feed axes with linear motors
⋅ V ⋅ 10
–3
P = F [kW]
n MAX, FN
Where:
F rated force [N]
n
V maximum velocity at the rated force [m/min]
MAX, Fn
of the feed axes is calculated using the engineering
VSA ZK
Speed ratio ñ/n
N
Coincidence factor K for the number of feed axes per area
Main spindles
For main spindle drives, the efficiencies must be included in the calculation
and are roughly estimated using the following factors:
v 4 kW
– Motors
+ 1.45 ⋅ P
P
MSD ZK
u 4 kW
– Motors
+ 1.25 ⋅ P
P
MSD ZK
Where:
P DC link power for the main spindle drive [kW]
MSD ZK
1.45 or 1.25 Assumed factor for the motor efficiency
P mechanical power [kW] used at the shaft of the
motor shaft MSD
main spindle motor
1 Overview of the Drive System
1.3 Engineering a drive
) for dimensioning
ZK
–3
[kW]
0
and coincidence factor K are known
N
[kW]
MSD motor shaft
[kW]
MSD motor shaft
1
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