摘要 |
A fan motor having a small thickness and its impeller's blades are formed to have a longer length in the diametral direction than a width in the axial direction. Since the blade of the fan motor has a tooth structure or chamfers at its edge end in the diametral direction, turbulence is forcibly evoked in an airflow to promote the turbulent diffusion, thereby suppressing the trailing vortex and reducing the aerodynamic noises, thus the ventilation efficiency is improved.
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