Disk storage device having a detachable coupling ring in the hub

  • US 5,864,443 A
  • Filed: 02/20/1998
  • Issued: 01/26/1999
  • Est. Priority Date: 09/07/1981
  • Status: Expired due to Fees
First Claim
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1. A disk storage device, comprising in combination:

  • a housing which encloses a clean room, said clean room having an internal mounting surface;

    at least one hard magnetic storage disk provided in said clean room for rotation about an axis, said at least one disk having a central opening;

    at least one read/write head mounted in said clean room for movement in operative relation to said at least one disk; and

    a brushless direct current motor mounted on the internal mounting surface of said clean room, said motor comprising a stator concentric with said axis, a stator winding disposed on said stator, and a rotor mounted for rotation about said axis relative to said stator, said rotor having a permanent magnetic member which is spaced from said stator across an air gap wherein said stator, said stator winding, and said permanent magnetic member are located within an inner space of said motor, said rotor further including a disk support member having a cylindrical portion which extends through the central opening of said at least one disk and includes an end wall, said end wall having an inner surface which encloses the upper portion of the inner space of said motor, a plurality of holes being formed in said end wall which are generally parallel to said axis and extend through said end wall from the inner space of said motor to the clean room, said rotor further including a cover ring disposed in the inner space of said motor for reducing the transfer of contaminants from the portion of the inner space of said motor axially below said cover ring to said clean room through said holes, said motor further including a detachable coupling for attaching said at least one disk to said disk support member.

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