Abstract
This paper describes a new design method for electric fans not only to reduce the blade passing frequency (BPF) noise but also to minimize the unbalanced forces of rotors. For the suppression of BPF level, the fans with unequally spaced blades have been proposed. Such fans, however, are likely to cause unbalanced vibrations by the asymmetric blades. In this paper, the relations between the unbalanced forces of rotors and the blade arrangements are discussed, and the design methods for minimizing the unbalanced forces are proposed. Furthermore, the condition for realizing completely balanced fans is derived.
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