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Article

Fan law knowledge can help performance

  • October 2002
  • Number of views: 20544
  • Article rating:

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: 

  • Volume of air moved
  • Static pressure
  • Load
  • Losses (efficiency)

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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EASA Technical Manual

More information on this topic can be found in EASA's Technical Manual
  • Section 2: AC Machines

Related Reference and Training Materials

Principles of Medium & Large AC Motors (NEMA Standards)
  • Section 2: Motor Enclosures

Principles of Medium & Large AC Motors (IEC Standards)
  • Section 2: Motor Enclosures

Tags: Fans
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