Papst Licensing Gmbh

Jurgen Oelsch

Helmut Hans

The invention relates to a spindle driving motor, in particular an external rotor motor, the main components of which are accommodated in the interior of a driving hub (4) or the back iron (5). According to the invention, in order to minimize the number of joints, both ball bearings (11, 12) are arranged directly, yet correctly as far as assembly is concerned, between the fixed shaft (10) and the back iron (5), a collar (15) having a larger diameter serving in particular to this end.

Disk storage device having a spindle driving motor

A disk storage drive is provided with a brushless drive motor having a stator with a winding. An external rotor housing including a permanent magnet coaxially surrounds the stator and is spaced therefrom by a substantially cylindrical air gap. A hub is provided that is concentric to the rotor housing and is connected to the rotor housing for rotation therewith. A bearing above the stator rotatably supports an upper end of the rotor housing on a stationary shaft and a bearing below the stator braces the open end of the rotor housing by a ring element having substantially the same heat expansion characteristics as the rotor housing.

Disk storage device having spindle assembly with ring enclosure

A disk storage drive is provided with a brushless drive motor having a stator (34) with a winding. An external rotor housing (32) including a permanent magnet (33) coaxially surrounds the stator and is spaced therefrom by a substantially cylindrical air gap. A hub (31) is provided that is concentric to the rotor housing (32) and is connected to the rotor housing for rotation therewith. A bearing (47) above the stator rotatably supports an upper end of the rotor housing on a stationary shaft (46) and a bearing (37) below the stator braces the open end of the rotor housing by a ring element (35) having substantially the same heat expansion characteristics as the rotor housing (32).

Disk storage drive for maintaining precision during thermal variations

A disk memory drive is presented having a stator and a rotor that is equipped with a centered hub, which hub has a surface onto which one or several hard disks are mountable. The bearing system between rotor and stator comprises two ball-bearings. The first ball-bearing is mounted between the rotor and stator a first distance from a rotational axis, and the second ball-bearing is mounted between the rotor and stator a second distance from the rotational axis, wherein the second distance is greater than the first distance.

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St. Georgen, Germany

Jurgen Oelsch