Patent Number: 7,825,558

Title: 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.

Inventors: Jungmayr; Gerald (Traun, AT), Amrhein; Wolfgang (Ottensheim, AT)

Assignee: EBM - Papst St. Georgen GmbH and Co. KG

International Classification: H02K 1/27 (20060101); F04D 25/06 (20060101); F04D 29/058 (20060101); H02K 7/09 (20060101)

Expiration Date: 2019-11-02 0:00:00