Dynamic Operation - Siemens SIMODRIVE 611 digital Configuration Manual

1 Overview of the Drive System
1.3 Engineering a drive
1.3.2

Dynamic operation

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