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Abstract

A driven fan consists of a traditional fan product combined with a motor and can also include a motor speed controller, as well as a transmission. Due to the immense number of possible permutations, it is normally impractical to directly measure wire-to-air fan performance at all possible operating points. Since individual power and transmission components are frequently manufactured by different parties, they are tested separately, if at all. To help this situation, testing and modeling methods have been developed to establish motor system performance at partial load conditions. Two of these methods are IEC 61800-9 and ISO 12759-6 (based on AMCA 207). The approach for each of these methods is distinct and will be discussed, along with a comparison to actual laboratory test results on AC induction motors and variable frequency drives.