Miniature fan
Assigneeebm-papst St. Georgen GmbH & Co. KG
InventorWolfgang Arno Winkler
Life of this patent
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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.
Claims9
A miniature fan, comprising
- an electronically commutated drive motor (18) with an internal stator (68) equipped with a stator winding arrangement, and an external rotor (27) connected to a shaft (62),
- on which external rotor is provided a permanent-magnet arrangement (66) that is in interaction with the internal stator (68),
- on which external rotor (27) is arranged a fan wheel (28) that is equipped with fan blades (26),
- further having a flange (40′) that supports a bearing tube (60) in which a central shaft (62) of the external rotor (27) is rotatably journaled,
- which flange (40′) defines a cavity (84) that serves to receive at least one first circuit board (86) equipped with electronic components, there being provided, in a boundary region between the flange (40′) and the electronically commutated drive motor (18),
- a second circuit board (96) that carries at least one galvanomagnetic sensor (100) which is configured to sense a magnetic field acting from the permanent-magnet arrangement (66) of the external rotor (27) on an associated point on the stator (68), and
- wherein
- the axial extent of the fan blades (26) is dimensioned such that at least a portion of each fan blade extends from the fan wheel (28) to an outer region (36) of the flange (40′), in order to improve the volumetric air flow (V/t) and the differential air pressure (Δp) generated by the fan (20).
A miniature fan, comprising
- an electronically commutated drive motor (18) having an internal stator (68) equipped with a stator winding arrangement (70), and an external rotor (27) connected to a shaft (62), on which shaft is provided a permanent-magnet arrangement (66) that is in interaction with the internal stator (68),
- on which external rotor (27) is arranged a fan wheel (28) that is equipped with fan blades (26),
- a flange (40′) that supports a bearing tube (60) in which the shaft (62) of the external rotor (27) is rotatably journaled,
- said flange (40′) defining a cavity (84) that serves to receive at least one first circuit board (86) equipped with electronic components, which components (88, 120, 122) are allocated at least predominantly to control and regulation tasks for the electric motor (18),
- a second circuit board (96) being provided in a boundary region between the flange (40′) and the electronically commutated motor (18), said board carrying at least predominantly components (100, 126) that serve for commutation of the electronically commutated motor (18),
- and electrical connections (104, 106) interconnecting the first circuit board (86) and the second circuit board (96).
Dependencies are inferred from the claim text.