Axial Fan

  • US 20060250039A1
  • Filed: 04/21/2006
  • Published: 11/09/2006
  • Est. Priority Date: 04/21/2005
  • Status: Active Grant
First Claim
Patent Images

1. An axial fan, comprising:

  • a shaft;

    a magnetic drive unit made up of a cylindrical rotor magnet fixed along one end of, and rotational unitarily with, said shaft, and a stator having a plurality of magnetic-pole teeth whose radial end portions diametrically oppose the cylindrical surface of said rotor magnet;

    a bearing unit disposed along the opposite end, with respect to said magnetic drive unit, of said shaft, said bearing unit for rotatably supporting said shaft and being of outer diameter smaller than said magnetic drive unit is in outer diameter;

    a case having an axially extending interior cavity in which said magnetic drive unit is accommodated and into which said stator is anchored;

    a bearing retainer for supporting said bearing unit, and fixed to said case; and

    an impeller fixed along said opposite end of said shaft beyond said bearing unit, and being diametrically larger than the outer diameter of said magnetic drive unit, said impeller for rotating together with said shaft to generate an axially directed flow of air;

    wherein said impeller is rotated at a rotational speed of at least 10,000 rpm.

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