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Passive magnetic bearings for a spindle motor

  • US 5,610,463 A
  • Filed: 06/02/1995
  • Issued: 03/11/1997
  • Est. Priority Date: 02/25/1994
  • Status: Expired due to Term
First Claim
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1. In a disc drive, an apparatus for journaling a rotor about a stator of a spindle motor comprising:

  • a pivot, said pivot for pivotally displacing said rotor about said stator;

    a raised magnetically permeable flange, said raised flange disposed on a top portion of said stator, said flange substantially annular in shape having an outer radius X;

    a first outer annular disc having inner radius greater than X, said outer annular disc comprising a first axially oriented magnetic pole, said outer disc fixably attached to said top portion of said stator and flush with said flange;

    a second opposing annular disc, said opposing annular disc comprised of a second axially oriented magnetic pole oriented similarly to said pole of said outer annular disc in the direction facing said outer annular disc, said opposing annular disc fixably attached to said rotor and centrally disposed so as to oppose said flange.

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