Ironless spindle motor for disc drive
First Claim
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1. A disc drive data storage system, comprising:
- a housing;
a central axis;
a stationary member which is fixed with respect to the housing and coaxial with the central axis;
a rotatable member which is rotatable about the central axis with respect to the stationary member;
a hydrodynamic bearing interconnecting the rotatable member with the stationary member;
at least one data storage disc attached to and coaxial with the rotatable member;
at least one magnet attached to the rotatable member; and
a stator winding which is fixed with respect to the housing and is coaxial with the rotatable member, wherein the stator winding has an ironless structure which is magnetically coupled to the magnet such that the stator winding and the hydrodynamic bearing cooperate to reduce excitation of pure tone vibrations in the disc drive data storage system.
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Abstract
An "ironless" bearing spindle motor for rotating at least one disc about a central axis in a data storage device comprises a housing, a stationary member, a hub, and a stator. A rotor magnet is attached to the hub. A bearing interconnects the hub with the stationary member such that the hub and rotor magnet are rotatable about the central axis. The stator is coaxial with the hub and includes an ironless stator winding. The ironless stator winding minimizes low-harmonic acoustic vibration peaks in the spindle motor, resulting in a spindle motor having a very quiet operation.
86 Citations
24 Claims
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1. A disc drive data storage system, comprising:
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a housing; a central axis; a stationary member which is fixed with respect to the housing and coaxial with the central axis; a rotatable member which is rotatable about the central axis with respect to the stationary member; a hydrodynamic bearing interconnecting the rotatable member with the stationary member; at least one data storage disc attached to and coaxial with the rotatable member; at least one magnet attached to the rotatable member; and a stator winding which is fixed with respect to the housing and is coaxial with the rotatable member, wherein the stator winding has an ironless structure which is magnetically coupled to the magnet such that the stator winding and the hydrodynamic bearing cooperate to reduce excitation of pure tone vibrations in the disc drive data storage system. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. A disc drive data storage system, comprising:
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a housing; a central axis; a hub which is rotatable with respect to the central axis; at least one data storage disc attached to and coaxial with the hub; a magnet which is carried by the hub; a stator winding which is fixed with respect to the housing; an overmold flowed over the stator winding; a hydrodynamic bearing having a first radial bearing surface formed by the magnet and a second radial bearing surface formed by the overmold; and wherein the stator winding has an ironless structure which is magnetically coupled to the magnet such that the stator winding and the hydrodynamic bearing cooperate to reduce excitation of pure tone vibrations in the disc drive data storage system.
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24. A hydrodynamic bearing spindle motor for a disc drive data storage system, comprising:
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a central axis; a housing; a stationary member which is fixed with respect to the housing; hub means for carrying at least one data storage disc and rotating the disc with respect to the central axis in response to a rotating magnetic field; hydrodynamic bearing means for interconnecting the hub means with the stationary member; and ironless stator winding means for generating the rotating magnetic field such that the ironless stator winding means and the hydrodynamic bearing means cooperate to reduce excitation of pure tone vibrations in the hydrodynamic bearing spindle motor.
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Specification