Miniature fan
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United States of America Patent
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-
Nov 6, 2012
Grant Date -
Jun 18, 2009
app pub date -
Dec 12, 2008
filing date -
Dec 17, 2007
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A miniature fan, particularly an axial fan, has a space-conserving structure which permits sophisticated electronic control circuits within a limited amount of space. It features an electronically commutated motor (ECM) including an internal stator 68, an external rotor 27 on a shaft 62, and a fan wheel 28 mounted on the rotor and bearing fan blades 26. The motor flange 40′ supports a bearing tube 60 which rotatably journals the rotor shaft 62 and is formed with a cavity 84 which receives a first circuit board 86 devoted to control of motor speed and/or voltage, and a second circuit board 96 which supports a galvanometric sensor 100 which senses the rotational position of the rotor, for purposes of triggering commutation of the motor stator windings 68 at appropriate times.
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