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Invention Grant
US07825558B2 Fan with active magnetic bearing 有权
风扇带主动磁轴承

Fan with active magnetic bearing
Abstract:
A fan (100) has an electronically commutated drive motor (ECM 52) with a stator (50) connected to a bearing tube (54) and a rotor (22) on a shaft (34). The shaft (34) is journaled in the tube (54) using passive radial magnetic bearings (16, 18) to minimize friction and wear, is axially displaceable with respect to the tube (54), and is drivingly connected to a rotor magnet (44) forming a first magnetic yoke (46). A second magnetic yoke (27) is connected to the shaft (34), and has an inner surface (59) defining a substantially cylindrical air gap (57) through which, during operation, a radial magnetic flux (55′) extends. A plunger coil (64) extends into the air gap (57) and is mechanically connected to the tube (54) so that, upon axial displacement of the plunger coil (64), the position of the shaft (34) with respect to the tube (54) changes.
Abstract(Chinese):

风扇（100）具有电子换向驱动马达（ECM52），定子（50）连接到轴承管（54）上，转子（22）连接在轴（34）上。 使用无源径向磁轴承（16,18）将轴（34）轴向安置在管（54）中，以使摩擦和磨损最小化，相对于管（54）可轴向移动，并且驱动地连接到转子磁体 44）形成第一磁轭（46）。 第二磁轭（27）连接到轴（34），并且具有限定大致圆柱形气隙（57）的内表面（59），在操作期间，径向磁通（55'）延伸通过该内表面。 柱塞线圈（64）延伸到空气间隙（57）中并且机械地连接到管（54），使得在柱塞线圈（64）的轴向位移时，轴（34）相对于 管（54）变化。

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