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Chuck Yung EASA Technical Support Specialist
Most of us involved in the repair of electrical equipment have a good understanding of how an electric motor works–especially the stator and rotor. But the fan can appear deceptively simple. Fans are pretty interesting, once we learn a few “affinity laws”—rules that also apply to blowers and impellers. This article will review some basic facts about fans that explain how small changes to a fan can make a BIG difference in the following critical areas:
These rules hold true for fan applications, impellers in pumping applications, and cooling fans on electric motors. When applied to the external fan of a TEFC (IP-54) motor, these rules offer some real opportunities for efficiency improvement.
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