Advantages
Attaching an internal fan to a motor is a fairly simple way to cool it. Since a fan cooled motor always provides airflow over itself regardless of whether it is stationary or partially enclosed, it is more effective than using a heat sink in applications with poor airflow because heat sinks usually require air to be flowing over them for maximum effectiveness. Internal fan cooling also takes up far less space than external fan cooling or water cooling.
Read more about this topic: Internal Fan-cooled Electric Motor
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