
2.MECHANICAL DESIGN HANDLING, DESIGN, AND ASSEMBLY B-65332EN/01
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2.13 PROTECTION AGAINST DUST AND WATER
If magnetic dust such as metallic dust is located near a rotor, the dust
may be attracted to the rotor. In particular, dust larger than the air gap
between the stator and rotor is caught between the gap, resulting in a
failure. In order to remove dust that builds up on the rotor, it is
strongly recommended that some sealing mechanism be installed.
Moreover, if the motor is exposed to coolant ceaselessly, the
insulation of the motor can degrade. Consider a structure that can
inimize the penetration of coolant. m
Usually, increasing the internal pressure by air purge operation is very
effective.
Besides coolant penetrating into the motor from the outside,
condensation may occur on the motor because of excessive cooling or
excessively high humidity. If condensation lasts for a long time, the
insulation of the motor can degrade. In such a case, take
anti-condensation measures such as reviewing the cooling condition
nd blowing dry air to the motor. a
or reference information, a typical axis structure is shown below F
.
NOTE
If sufficient dust and water protection is provided,
foreign matter may penetrate unexpectedly near
the motor, causing a failure or reducing the life of
the motor remarkably.