US 5,006,943 A · Disk storage drive

Abstract

A disk storage drive is provided with a brushless drive motor having a stator with a winding. An external rotor coaxially surrounds the stator and is spaced therefrom by a substantially cylindrical air gap. The rotor includes a permanent magnet and a soft magnetic yoke. A hub is provided that is concentric to the yoke and is connected to the rotor for rotation therewith. The hub has a disk mounting portion on its outer peripheral surface that can be passed through the central opening of a standardized storage disk for mounting the storage disks for rotation therewith. At least half of the axial longitudinal dimension of the stator winding and the rotor magnet interacting therewith is housed within the disk mounting portion of the hub. The hub is made from a non-ferromagnetic material that is suitable for storage drive clean chamber use after dimensional finishing of the hub.

Claims24

Dependent claims

A disk storage drive with a brushless drive motor having a stator provided with a winding;

an external rotor coaxially surrounding the stator and spaced therefrom by a substantially cylindrical air gap, said rotor having a permanent magnetic rotor magnet and a soft magnetic yoke;
and a hub concentric to the yoke, said hub being connected to the rotor for rotation therewith and having a cylindrical disk support portion which can pass through a central opening of a storage disk for receiving at least one storage disk, said hub having an outwardly radially projecting flange at one end said motor including a radially extending assembly flange adjacent said one end of said hub, said assembly flange having a recess co-operating with said radially projecting flange to allow said radially projecting flange to nest in said recess, thereby making the motor more compact.

Dependencies are inferred from the claim text.

Disk storage drive

Life of this patent

Disk storage drive

Life of this patent

Abstract

Claims24