Disk storage drive
AssigneePapst-Motoren GmbH & Co. KG
InventorsDieter Elsasser, Bernhard Schuh
Life of this patent
Estimating the term…
Abstract
Disk storage drive for receiving at least one storage disk provided with a central opening. The disk drive is provided with an outer rotor type driving motor having a rotor casing mounted by means of a shaft in a bearing system so as to rotate relative to a stator and receive the storage disk. The stator includes magnetically active parts. At least that part of the rotor casing receiving the storage disk is made from a non-ferromagnetic material and carries the shaft either directly or by means of a hub. A shield made from a ferromagnetic material is provided as an inner part of the rotor casing. The shield envelopes the circumference and one end of the magnetically active parts of the driving motor. The outer diameter of the rotor casing is smaller than the central opening of the storage disk.
Claims29
A disk storage drive for receiving at least one storage disk having a central opening, said drive including an outer rotor type motor, comprising
- a rotor casing having a shaft mounted therein extending axially internally thereof;
- a bearing system receiving said shaft and rotatingly mounting said rotor casing;
- a stator including magnetically active parts of said motor, said rotor casing being mounted to rotate around the periphery of said stator,
- said rotor casing having a storage disk receiving part, said storage disk receiving part having a substantially cylindrical circumferential outer surface portion coaxial to said shaft and formed to coaxially extend through said central opening of said storage disk to receive and drive said disk, said storage disk receiving part being made of a non-ferromagnetic material;
- a separate distinct magnetic shield mounted internally of said rotor casing and having a substantially cylindrical wall portion generally peripherally surrounding the magnetically active parts of the motor and being radially enclosed for at least part of the axial extension thereof by said circumferential surface portion of said storage disk receiving part, the diameter of said substantially cylindrical circumferential portion of said disk receiving part being larger than the diameter of said substantially cylindrical wall portion of said magnetic shield and smaller than the diameter of the central opening in said magnetic disk, said magnetic shield being made of a ferromagnetic material.
A disk storage drive for receiving at least one storage disk having a central opening, said drive including an outer rotor type motor comprising:
- a generally cylindrical rotor casing closed at one of its ends and having a shaft coaxially mounted therein;
- a bearing system receiving said shaft and rotatingly mounting said rotor casing;
- a bearing tube coaxially mounting said bearing system;
- a stator supported on the outside of said bearing tube, said stator including magnetically active parts of said motor, said rotor casing being mounted to rotate around the periphery of said stator;
- said rotor casing having a storage disk receiving part with an outer peripheral surface;
- a magnetic shield mounted internally of the rotor casing radially intermediate the outer peripheral surface of said storage disk receiving part and the magnetically active motor parts;
- said storage disk receiving part being formed to coaxially extend through said central opening of said storage disk for receiving and driving the disk, said receiving part being made of a non-ferromagnetic material;
- said magnetic shield being made of a ferromagnetic material and having a cylindrical body portion generally peripherally surrounding, and at one of its ends enclosing, the magnetically active parts of the motor, and being peripherally encircled by said storage disk receiving part,
- the outer peripheral surface of said storage disk receiving part radially surrounding both the magnetic shield and the magnetically active parts of the motor being sufficiently smaller than the central opening of the storage disk to receive the disk thereon, whereby the drive motor extends coaxially through the central opening of the storage disk, the magnetically active parts of the motor being partially located within the central opening of the storage disk.
Dependencies are inferred from the claim text.