Technical data

16-10 Notes Application MHD Sychronous motors
DOK-MOTOR*-MHD********-PR05-EN-P
Connection Instructions
Coolant lines can be designed either as
pipeline or as
tubing system.
Note: Owing to the turning points inevitably present in pipeline
systems (e.g. 90-degree elbows), high pressure losses
develop in the cooling lines. For that reason, we recommend
that tubing systems be used.
When selecting the coolant lines, please be absolutely sure to
take the pressure drop within the system into consideration. If
greater lengths are used, the inside diameter of the lines
should, therefore, at least be 9 mm and be reduced only
shortly before being connected to the motor.
The data specified in the documentation relate to water as coolant.
The flow in the coolant in the drive components is subject to changes in
cross-section and direction. For that reason, there are friction and turning
losses. These losses show as the pressure drop
∆p.
The pressure drop
∆p
n
of the liquid-cooled motors is specified in the
technical data. It relates to the specified flow volume of water as coolant.
If the flow volume is converted to a different temperature increase, the
pressure drop must be taken from the characteristic curve below.
0 1 2 3 4 5
3.0
2.5
2.0
1.5
1.0
0.5
0
Volume flow (l/min)
Pressure drop Dp (bar)
K03MH81P.fh10
Flow diagram determined with 20°C water
Fig. 16-17: Flow diagram for MHD motors
Note: If a different coolant is used, a different coolant-specific flow
diagram is applicable.
Please refer to the documentation entitled “Liquid Cooling of INDRAMAT
Drive Components” (DOK-DIAX01-DRIVE***LIQ-AUS1-EN-P), material
number 265 836, for advanced information on additives and other
coolants.
Coolant lines
Coolants
Pressure drop
Additional documentation