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Disk drive spindle motor having split windings for each phase

  • US 5,500,780 A
  • Filed: 08/05/1994
  • Issued: 03/19/1996
  • Est. Priority Date: 08/05/1994
  • Status: Expired due to Fees
First Claim
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1. A rotating disk data storage device, comprising:

  • a disk drive base;

    at least one disk for recording data, said disk being adapted to rotate about an axis of rotation, said disk having a circular aperture at its center for mounting said disk on a rotatable hub assembly;

    at least one transducer head for reading data stored on said disk;

    a moveable actuator mounted on said disk drive base for positioning said transducer head to read data recorded on said disk, said transducer head being attached to said moveable actuator; and

    a spindle motor mounted on said disk drive base for rotating said at least one disk about said axis of rotation, said spindle motor comprising;

    (a) a rotor housing adapted to rotate about said axis of rotation, said rotor housing having a substantially cylindrical main body portion, said main body portion having a diameter less than the diameter of said aperture of said disk, and a substantially cylindrical flange portion extending radially outward from said main body portion, said flange portion having a diameter greater than the diameter of said aperture of said disk, said flange portion supporting said disk;

    (b) a first set of permanent magnets mounted within said cylindrical main body portion of said rotor housing and surrounding said axis of rotation at a first radial distance;

    (c) a second set of permanent magnets mounted within said flange portion of said rotor housing and surrounding said axis of rotation at a second radial distance, said second radial distance being greater than said first radial distance; and

    (d) an electromagnetic stator assembly rigidly mounted to said disk drive base and surrounding said axis of rotation, said electromagnetic stator assembly including a first stator portion for driving said first set of permanent magnets, and a second stator portion for driving said second set of permanent magnets.

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