Driving mechanism for magnetic hard disc memories

  • US 4,519,010 A
  • Filed: 12/02/1981
  • Issued: 05/21/1985
  • Est. Priority Date: 12/05/1980
  • Status: Expired due to Term
First Claim
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1. A driving mechanism for magnetic hard disc memory having a read/write head, comprising:

  • means in said mechanism isolating an enclosed space for maximum cleanness;

    a brushless direct current driving motor mounted within said driving mechanism and having a stator, including a stator lamination, and a rotor, said rotor being a permanent magnet outer rotor having a bell-shaped rotor casing and at least one permanent magnet fixed in the rotor casing, said motor when energized having parts producing magnetic flux;

    a rotor shaft mounting said rotor, said shaft being mounted by bearing means in said driving mechanism;

    a hub extending into the isolated enclosed space of maximum cleanness for receiving therein at least one magnetic hard memory disc having magnetic tracks with which the read/write head aligns in a reciprocal alignment relationship;

    means connecting said motor and said hub for driving said hub;

    means forming a magnetic flux shield and located between the parts producing the magnetic flux and the isolated enclosed space of maximum cleanness; and

    means detachably connecting the rotor to the rotor shaft independently of said means connecting said motor and said hub, whereby said rotor is removable from said rotor shaft without affecting the reciprocal alignment between the read/write head and the magnetic tracks of the hard memory disc.

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