Spindle motor having a fluid dynamic hybrid bearings
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Spindle motor with a stationary engine component having a base plate (12, 112) and a bearing bush connected thereto (14, 114), and a rotating engine component, one mounted in the bearing sleeve shaft (16, 116) and a hub (26, 126 ), wherein the engine components by means of a hydrodynamic bearing (22, 24, 30, 32, 48; 122, 124, 130, 132, 148) relative to each other are rotatably supported and are rotationally driven by an electromagnetic drive system, in addition to the hydrodynamic bearing ( 22, 24, 30, 32, 48; 122, 124, 130, 132, 148) a dynamic air bearing (52, 62, 63; 152; 162 is provided) comprising two bearing surfaces which are separated by an air gap, characterized by pumping patterns which are disposed on one or both bearing surfaces, characterized in that the hub (26, 126) forms an air tight enclosed cavity, whose only access the air gap and the air bearing (162 52, 62, 63;; 152) the Luftl agers (52, 62, 63; 152; 162), wherein the air bearing generates a directional pumping action and permanently into pumps air into the cavity, whereby the air pressure within the hub, and consequently the pressure in the hydrodynamic bearing gap increases.