Electrical generator or motor structure – Dynamoelectric – Rotary
Reexamination Certificate
2001-02-23
2003-01-14
Mullins, Burton S. (Department: 2834)
Electrical generator or motor structure
Dynamoelectric
Rotary
C310S090000, C310S06700R, C310S051000, C384S425000
Reexamination Certificate
active
06507135
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to an axial ventilator (axial fan) with an external-rotor drive motor, whose external rotor comprises a permanent magnet. External-rotor drive motors, for example, for driving axial ventilators, are known from European patent application 0 766 370 (EP198=EP-1011).
2. Description of Related Art
Should such a motor be subjected to impacts, a force acts on the rotor and moves it in the axial direction relative to the stator. Subsequently, the rotor moves back into its normal position relative to the stator. During this axial movement, it may happen that the rotor shaft impacts on the housing and then produces disturbing clattering noises.
SUMMARY OF THE INVENTION
It is therefore an object of the invention to provide a new axial ventilator.
According to the invention, this object is solved by an axial ventilator comprising an external-rotor drive motor whose external rotor provided with a rotor shaft drives a ventilator wheel and, in operation, rotates about an internal stator, wherein in the internal stator a bearing support tube is arranged in which a radial plain bearing is arranged which supports the shaft of the external rotor, and comprising an axial plain bearing which is provided between a free end of the rotor shaft and a stationary counter member, the latter comprising a thrust element which is supported on an elastomeric shaped member. By means of the elastomeric shaped member and the described configuration, the conduction of clattering noises into the ventilator housing is damped and reduced.
Another solution of the above object is characterized by a ventilator housing; a ventilator wheel cooperating with the ventilator housing; an external-rotor drive motor with an internal stator and an external rotor, with the ventilator wheel (
36
) being arranged on the latter; a rotor shaft for supporting the external rotor; a bearing support tube in which a radial plain bearing for the rotor shaft is arranged; an axial plain bearing for the rotor shaft which is provided between a free end of the rotor shaft and a stationary counter member, the latter comprising a thrust element for this free end of the rotor shaft, which thrust element is supported by an elastomeric shaped member which is arranged in a recess of the ventilator housing.
REFERENCES:
patent: 2829288 (1958-04-01), Scaheffer
patent: 3513339 (1970-05-01), Harris et al.
patent: 3644066 (1972-02-01), Heob et al.
patent: 3705752 (1972-12-01), Ott et al.
patent: 3720852 (1973-03-01), Vieweg et al.
patent: 3749457 (1973-07-01), Latussek et al.
patent: 3922041 (1975-11-01), Quaile et al.
patent: 3935489 (1976-01-01), Church et al.
patent: 4452541 (1984-06-01), Carpenter
patent: 4519010 (1985-05-01), Elsaesser et al.
patent: 4955791 (1990-09-01), Wrobel
patent: 766370 (1997-04-01), None
Abstract JP 7-147761, Takahashi, Jun. 6, 1995.*
Abstract JP 9-233738, Shinohara, Sep. 5, 1997.
Huckett Gudrun E.
Mullins Burton S.
Papst-Motoren GmbH & Co. KG
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