
2.MECHANICAL DESIGN HANDLING, DESIGN, AND ASSEMBLY B-65332EN/01
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2.6 LIQUID COOLING
2.6.1 Coolant
Water is used for water cooling. However, tap water may contain
metallic ions. If tap water is used for a long time, scales (contaminant
layers and lumps) build up, and can degrade heat exchange efficiency
nd can clog the cooling tube. So, use ion exchange water.
a
Steel is employed for a cooling jacket used with the Dis series motor.
So, as an anti-corrosive agent to be added to cooling water, use an
agent that does not corrode steel. Moreover, do not use a strong
lkaline anti-corrosive agent.
a
Cooling oil may be used instead of cooling water. When cooling oil is
used, however, a degraded cooling efficiency results due to a
characteristic difference between water and oil, and the continuous
rated force decreases accordingly. So, when using cooling oil,
onsider an output margin of ten percent to several tens percent.
c
NOTE
On cooling water, an anti-corrosive agent, and
cooling oil, a restriction may be imposed not only
from the motor but also from the chiller. So, consult
with a chiller supplier as well to select a cooling
medium that does not adversely affect the motor
and chiller.