Table of Contents
DOK-MOTOR*-MSK********-PR12-EN-P
Synchronous Servomotors MSK
9.12.3
Liquid cooling
General information
Coolant duct
Operating pressure
Pressure drop
Contamination can reduce the flow rate of the fans and lead to thermal over‐
load of the motors. When the motors are operated in a dirty environment, the
availability of the system is increased by cleaning the fans and motor cooling
fins at regular intervals. When designing the machine, consider the accessi‐
bility of motor and fan for maintenance work. Special instructions for mainte‐
nance and troubleshooting of motor fans can be found in
tenance" on page
261.
Rexroth motors in liquid-cooled version are suitable for increased loads, e.g.
for continuous start-stop operation with high repetition frequencies. MSK mo‐
tors for liquid cooling are marked with "FN" in the type code.
Coolant ducts can be designed as
●
pipeline system or
●
as hose
system.
Due to the deflection points occurring in piping systems (e.g. 90°
bends), pressure losses occur in the coolant lines. Therefore we
recommend hose line systems.
When selecting the coolant lines, the pressure drop within the
system must be taken into account. For longer lengths, the inner
diameter of the cables should therefore be at least 9 mm and tap‐
er only shortly before connection to the motor.
The maximum coolant inlet pressure of 6 bar shall be applicable to all MSK
motors. For motors manufactured before 2010-01-01 FD 10W01 the inlet
pressure must be limited to 3 bar.
Please observe that additional screw connections or junctions in the cooling
circuit can have an influence on the flow and supply pressure of the cooling
medium. The pressure drop Δp
technical data.
The flow of the coolant in the drive component is exposed to cross-sectional
and directional changes. Friction and deflection losses thus occur in the com‐
ponent. These losses appear in the form of a pressure drop Δp.
It refers to the indicated flow rate of the coolant water. If the flow rate is con‐
verted to a different temperature increase, the pressure drop must be taken
from the following characteristic curve.
Bosch Rexroth AG
Operating conditions and application notes
of the liquid-cooled motors is specified in the
n
227/279
chapter 13.4 "Main‐
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