Bosch MSK030B-0900-NN, Project Planning Manual

Page: 230 / 282

Fig. 9-14: Flow diagram for MSK motors
If a different coolant is used, a different coolant-specific flow dia‐
gram applies.
Selection of the cooling system
The motor power loss P
V
transformed to heat is dissipated using the cooling
water. Liquid-cooled motors may therefore only be operated via an externally
connected cooling unit in order to guarantee the required coolant inlet tem‐
perature.
Cooling units are not supplied by Bosch Rexroth and must be di‐
mensioned and provided by the customer. See also chapter
"Manufacturers of cooling units" on page 230 .
Dimensioning An effective heat loss dissipation is a prerequisite for achieving the specified
motor data. The amount of heat loss in the motor is largely determined by the
utilization rate of the motor. How well or how quickly the heat loss can be dis‐
sipated determines the performance of the motor.
The performance of the cooling unit or cooling system must therefore be de‐
signed in such a way that the resulting power loss of the motors can be dissi‐
pated at any time. If several motors are operated on one cooling system, this
applies to the sum of the individual power losses. The required coolant pres‐
sure must also be able to be achieved at maximum volume flow.
The required cooling and pump capacity is calculated from the
sum of the connected motors or heat carriers, the specified mini‐
mum flow rate and the pressure drop.
When designing and dimensioning the cooling system, observe
the project planning “Liquid cooling from Rexroth drive compo‐
nents”, MNR R911265836.
Bosch Rexroth AG DOK-MOTOR*-MSK********-PR12-EN-P 228/279
Synchronous Servomotors MSK
Operating conditions and application notes