Bosch Rexroth A4CSG - Page 68

68/104 Commissioning
Bosch Rexroth AG, A4... with HS5E pilot control valve/Series 3x, RE 92076-01-B/10.2017
Key
V
g
Displacement per revolution [cm
3
]
Δp Differential pressure [bar]
n Rotational speed [rpm]
η
v
Volumetric efficiency
η
hm
Hydraulic-mechanical efficiency
η
t
Total efficiency (η
t
= η
v
× η
hm
)
Fig. 22: Parameters for torque limitation
At determination of the torque limitation value, it is assumed that efficiencies are
100%.
Example: Electric motor output of 75kW at 1480rpm should not be exceeded. The
pump of the NG 355 was limited mechanically to 320cm
3
. The value for pressure
standardization was input as 350bar.
Electric motor T =
60,000
×
P
=
9549
×
75
= 483.9 Nm
2π
n 1480