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Generators or Motors

Axial-flow-fan-having-a-compact-circuit-board-and-impeller-blade-arrangement

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Axial flow fan having a compact circuit board and impeller blade arrangement

Details

Inventors: Bradbury, Phillip James; Nguyen, Phep Xuan; Jenkins, Jr., Chalmers R.;
Assignee: NMB USA Inc. (Chatsworth, CA)
Primary Examiner: Freay; Charles G.
Assistant Examiner: Evora; Robert Z.
Attorney, Agent or Firm: Amster, Rothstein & Ebenstein

An axial flow fan comprising a printed circuit board which mounts the circuitry for operating the motor which is a bipolar winding motor. A voltage regulator IC and a driving IC for a bipolar winding motor are mounted on the printed circuit board. The fan housing is employed as a heat sink for the voltage regulator. Large circuit elements are eliminated. The axial flow fan further comprises a plurality of blades for cooling electronic components wherein the blades comprise of a plurality of specially designed airfoil sections, each section having along substantially the entire length thereof, a cross-sectional shape characterized by a maximum thickness located substantially constantly between about 19% chord to about 20% chord and a maximum camber located substantially constantly between about 45% chord to about 46% chord. The circuitry, housing, and blades are designed so that the axial width of the axial fan is decreased while maintaining performance parameters and design constraints.

DETAILED DESCRIPTION Accordingly, it is an object of this invention to provide an axial flow fan with reduced axial width while maintaining performance parameters and design constraints.
An additional object is to provide an axial flow fan with reduced axial width by eliminating large electronic circuit components.
It is yet another object of the invention to provide an axial flow fan that is capable of operating from a starting voltage in the range of about 28V-64V.
It is a further object of the invention to provide an axial flow fan with reduced axial width by employing the housing as a heat sink.
It is still a further object of the invention to provide an axial flow fan with reduced axial width by employing a voltage regulator IC.
It is an additional object of the invention to provide an axial flow fan with reduced axial width by employing a bipolar winding motor.
It is an additional object of the invention to provide a blade incorporating a family of airfoil sections capable of reducing the axial width of an axial flow fan while maintaining performance parameters and design constraints.
It is yet another object of the invention to provide a blade incorporating a family of airfoil sections which allow for the reduction of the axial width of an axial fan while locating the maximum work distribution between the root portion and the tip portion of the blade.
It is yet another object of the invention to provide a blade incorporating a family of airfoil sections which allow for the reduction of the axial width of an axial fan while maintaining a favorable velocity profile over the suction side of the blade.
These and other objects are realized by a stator comprising a core and at least one winding, and a printed circuit board having circuitry for operating the motor, the printed circuit board secured to the stator and electrically connected to the at least one winding of the stator.
The circuitry includes a voltage regulator.
Also provided is an axial flow fan comprising: a motor comprising a magnet, a yoke, and a stator assembly

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