Advertisement
11.00
09.00
1.2
Cooling
The built–in motor stators are liquid–cooled. The user must connect the duct,
which is used for cooling, to the cooling circuit. The following conditions must be
maintained:
Cooling medium
An anti–corrosion agent (e.g.Tyfocor) must be added to the water. In this case,
and cooling quan-
the following ratio must not be exceeded:
tity
Water:
Anti–corrosion agent:
Adequate heat transfer is achieved
with a flow of:
When using another cooling medium (e.g. oil, cooling–lubricating medium), it
may be necessary to reduce the output, in order to limit the thermal loading on
the spindle bearings.
In order to calculate the power reduction (de–rating), the following cooling me-
dium characteristics must be known:
Specific gravity
Specific thermal capacity
Note
For oil–water mixtures with less than 10 % oil, the motor output does not have
to be reduced. The cooling medium must be pre–cleaned or filtered in order to
prevent the cooling circuit being blocked.
Maximum permissible partical size after filtering:
The cooling duct geometry has been designed so that the power losses of the
stator, and some of the rotor losses, can be dissipated. All of the built–in motors
have the same geometry.
Cooling medium
Maximum pressure drop across the motor:
pressure
Maximum pressure at the inlet:
Cooling medium
Recommended:
inlet temperature
In order to prevent moisture condensation, the cooling medium inlet tempera-
ture can, depending on the ambient temperature, be up to 40 °C.
The motors are designed for operation at 40 °C cooling medium temperature,
but still maintaining all of the nominal motor data. In this case, an additional ther-
mal decoupling between the motor components and the spindle bearings must
be used, in order to avoid critical bearing temperatures.
For a cooling medium temperature of 25 °C, the following cooling powers must
Cooling powers
be provided in continuous operation:
Siemens AG 2000 All rights reserved
SIMODRIVE Planning Guide Motors (PJM) – 11.00 Edition
75 %
25 %
8 l/min
ρ [kg/m
c
p
25 °C
6SN1197–0AA20
1PH2 AC Built–in Motors
1.2 Cooling
3
]
[J/(kg<K)]
100 µm
0.3 bar
7.0 bar
1PH2
1PH2/1-9
Advertisement
