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Fan law knowledge can help performance

Publication date: 
October 2002
Chuck Yung, EASA Senior Technical Support Specialist
Type of media: 

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.

AC motor cooling
DC motor cooling