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Application notes
9.7
Motor cooling
9.7.1
General information
9.7.2
Coolant
General information
Aqueous solution
Bosch Rexroth AG R911298798_Edition 08
●
Prevent any contamination, chips and dirt in the motion range of motors.
The motor power loss P
V
liquid cooling system. MBT motors can only be operated if the coolant supply
is ensured. The machine manufacturer has to realize the cooling system in so
that all requirements regarding flow, pressure, cleanliness, temperature gra‐
dient, etc. are complied with in every operating state.
CAUTION
⇒ Follow the motor data and explanations on the concept of cooling systems
contained in the documentation "Liquid Cooling of Rexroth Indramat Drive
Components", DOK-DIAX01-DRIVE***LIQ-AU□□-□□-P.
⇒ Comply with the manufacturer's instructions when designing and operating
cooling systems.
⇒ Do not use any cooling lubricants or cutting materials of machining pro‐
cesses.
⇒ Avoid contamination of the cooling medium as well as modifications of
chemical composition and pH level,
All specifications and technical data refer to water as coolant. When using
other coolants, this data is no longer valid and has to be recalculated.
It is not recommended to use cooling with running tap water. Calcareous tap
water can cause deposits and damage the motor and the cooling system.
For corrosion protection and for chemical stabilization, an additive which is
suitable for mixed installations with the materials AlSi5Mg (cooling jacket)
and FPM (O-ring) has to be added to the cooling water.
The motors can be damaged irreparably by use of aggressive coolants, addi‐
tives and cooling lubricant or by contaminations of the coolant.
●
Use systems with a closed circuit and a fine filter ≤ 100 µm.
●
Avoid contamination of the cooling medium as well as modifications of
chemical composition and pH.
●
Refer to the environmental protection and waste disposal instructions at
the place of installation when selecting the coolant.
Rexroth does not make any general statements and does not contact any re‐
search regarding the suitability of system-specific coolants or operating con‐
ditions.
The performance test for the used coolants and the design of the
liquid coolant system are generally the responsibility of the ma‐
chine manufacturer.
Aqueous solutions ensure reliable corrosion protection without significant
changes to the physical properties of the water. The recommended additives
do not contain any substances hazardous to water.
MBT High Synchronous Torque Motors
is converted into heat and then dissipated via the
Impairment or failure of motor, machine or
cooling system!
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