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Semipermanent Life and Low-Acoustic Noise Air-Moving Device with Separation of Rotor and Stator

IP.com Disclosure Number: IPCOM000118446D
Original Publication Date: 1997-Feb-01
Included in the Prior Art Database: 2005-Apr-01
Document File: 2 page(s) / 49K

Publishing Venue

IBM

Related People

Nakanishi, T: AUTHOR [+2]

Abstract

Disclosed is an Air Moving Device (AMD) for cooling the heat dissipation device/system.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 87% of the total text.

Semipermanent Life and Low-Acoustic Noise Air-Moving Device with
Separation of Rotor and Stator

      Disclosed is an Air Moving Device (AMD) for cooling the heat
dissipation device/system.

      This AMD has the characteristic of semipermanent life and
low-acoustic noise because of the mechanical separation of the Rotor
and Stator with the magnetic force.

      As a result, this AMD does not need to have the mechanical
bearing to combine the Rotor and Stator.  Therefore, this has three
benefits:
  1.  No acoustic noise caused by the bearing
  2.  Life of this AMD does not depend on the life of bearing
  3.  Bigger airflow Figures show an example of this device
       and the structure.  Fig. 1 is the isometric view.  Fig. 2
       is the structure section view from A-A on Fig. 1.

      In Fig. 1, this AMD (1) has the 4 poles Stator core (2), which
creates the switching magnetic force, at four corners of the housing
(3).  In Fig. 2, the impeller (4) is located as the part of the Rotor
(5), which is floated at the center of the circle created by Stators
by the magnetic force of the permanent magnet (6) located at the
inner of the housing.

      The vibration of the Rotor does not increase/expand but
converges because of the uniform and continuous force from the center
of the housing inner circle, which is applied to the Rotor.  Besides
the increase of space which may be applied to the impeller, the air
flow is larger compared to...