Siemens Sinumerik 840D Series Function Manual page 17

02.99
10.03
Table 1-1 Comparison of electric and hydraulic drive systems
Criterion Electric direct drive
Noise Noise produced by
linear guides
Acceleration max. 45 g
characteristics
Drive cooling Absolutely essential
Sensitivity to High
ferromagnetic
swarf
 Siemens AG, 2003. All rights reserved
SINUMERIK 840D/SIMODRIVE 611 digital, HLA Module (FBHLA) - 10.03 Edition
1.2 Comparison of electric and hydraulic drive systems
Electric drive with
Noise produced by servo-
motor and leadscrew
max. 1 g
Required only at high
speeds
Low
Table 1-2 Analogy of characteristic data
Electric
Spindle speed
Velocity
Current
DC link voltage
Power
Transistor/power section
Motor
leadscrew
S
Flow through valve may
produce noise.
S
Pump noise on
hydraulic power unit.
max. 2 g
Required in some cases, in
power unit only
Low
Velocity
flowrate
System pressure
Flow rate @ Valve pressure differential
Valve
Drive cylinder
1 General
Hydraulic drive
Hydraulic
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