9
Liquid Cooling MSK133
9.1
Water Cooling of Motors
9.1.1
Selection of Cooling System
The heat of the transformed motor power loss P
V
is dissipated using the cool‐
ing water. Liquid cooled motors may only be load with the specified nominal
torque, if an external heat exchanger unit is connected and the necessary
cooling inlet temperature is ensured.
●
Heat exchanger units are not in the scope of delivery of
Bosch Rexroth and must be dimensioned and prepared by
the customer. See also
chapter 9.1.3 "Manufacturers of
Heat Exchanger Units" on page 62
Dimensioning
An effective power loss dissipation is precondition to reach the specified mo‐
tor data. The height of the power loss in the motor is significantely defined by
the utilization capacity of the motor. The motor performance depends from as
good as or as fast as the power loss can be dissipated.
Therefore, dimension the performance of the heat exchanger unit or cooling
system in such a way, that arising power loss of the motors can be removed
at any time. This is valid for the total sum of each power loss, if several mo‐
tors are operated on one cooling system, The necessary coolant pressure
must be generated even at maximum volume current.
The necessary cooling and pump performance is calculated by
the sum of the connection motors, the specified minimum flow
and the pressure drop.
Please observe the project planning manual "Liquid Cooling of
Rexroth Drive Components", MNR R911266417.
Cooling circuit
Generally, 2 different cooling circuits are used to cool the motors.
●
closed cooling circuit (no penetration of oxygen possible)
●
half-open cooling circuit (only through the pressure compensation con‐
tainer can oxygen penetrade into the cooling system)
Open cooling circuits with intensive oxygen contact are not al‐
lowed. Bosch Rexroth recommends to design the cooling circuits
as closed system, to minimize the system-wide bacterial growth.
The occuring electro-chemical processes within the cooling system must be
minimized via selection of the materials. Avoid mixed installations, e.g. com‐
binations of different materials, like copper, brass, iron, zinc and halogenated
plastics (e.g. tubes and sealings made of PVC)
DOK-SYTROX-MPA01******-IT02-EN-P
Rexroth Sytronix SvP 70xx Motor-Pump Unit MPA01
Bosch Rexroth AG
61/123
Liquid Cooling MSK133
LSA Control S.L. www.lsa-control.com comercial@lsa-control.com (+34) 960 62 43 01
