Spindle motor with encapsulated stator and method of making same
First Claim
Patent Images
1. A hard disc drive comprising:
- i) a read/write head and ii) a spindle motor, the spindle motor comprising;
a) a baseplate;
b) a shaft supported by said baseplate;
c) a stator assembly comprising i) a core having poles and ii) windings around said poles;
iii) the stator core being rigidly attached to said baseplate;
d) injection molded thermoplastic material substantially encapsulating said windings and contacting the baseplate such that the windings, core and baseplate are rigidly fixed together, said thermoplastic having a modulas of elasticity of at least 1,000,000 psi at 25°
C.; and
e) a hub supported on said shaft, said hub having a magnet connected thereto in operable proximity to the stator assembly.
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Abstract
A spindle motor comprises a baseplate, a shaft supported by said baseplate, a stator assembly having windings, the stator being rigidly attached to said baseplate, injection molded thermoplastic material encapsulating said windings, and a hub supported on said shaft, said hub having a magnet connected thereto in operable proximity to the stator assembly. In one embodiment, the stator is coreless. In other embodiments, the stator has a core and the core is substantially encapsulated by the thermoplastic material. In preferred embodiments, the thermoplastic material secures the stator to the baseplate or forms the baseplate.
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Citations
54 Claims
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1. A hard disc drive comprising:
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i) a read/write head and ii) a spindle motor, the spindle motor comprising;
a) a baseplate;
b) a shaft supported by said baseplate;
c) a stator assembly comprising i) a core having poles and ii) windings around said poles;
iii) the stator core being rigidly attached to said baseplate;
d) injection molded thermoplastic material substantially encapsulating said windings and contacting the baseplate such that the windings, core and baseplate are rigidly fixed together, said thermoplastic having a modulas of elasticity of at least 1,000,000 psi at 25°
C.; and
e) a hub supported on said shaft, said hub having a magnet connected thereto in operable proximity to the stator assembly. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A hard disc drive comprising:
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i) a read/write head and ii) a spindle motor, the spindle motor comprising;
a) a baseplate;
b) a shaft supported by said baseplate;
c) a stator assembly comprising i) a core having poles and ii) windings around said poles, the baseplate and stator assembly not being in direct contact with one another but rather the stator assembly being spaced from the baseplate;
d) a hub supported on said shaft, said hub having a magnet connected thereto in operable proximity to the stator assembly; and
e) a thermoplastic material secured to the baseplate and substantially encapsulating the stator windings, the thermoplastic material joining the stator assembly to the baseplate in the space between the stator assembly and the baseplate, filling in the space between them such that the windings, core and baseplate are rigidly fixed together. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34)
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35. A spindle motor comprising:
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a) a baseplate made of stiff thermoplastic material, having a modulas of elasticity of at least 1,000,000 psi at 25°
C., and a metal plate substantially encapsulated by the stiff thermoplastic material;
b) a shaft supported by said baseplate;
c) a stator assembly comprising i) a core having poles and ii) windings around said poles;
d) a hub supported on said shaft, said hub having a magnet connected thereto in operable proximity to the stator assembly; and
e) a vibration dampening thermoplastic material encapsulating the stator windings, the vibration dampening thermoplastic material having a vibration dampening ratio of at least 0.05 in the range of 0-500 Hz and joining the stator assembly to the baseplate. - View Dependent Claims (36, 37, 38, 39, 40, 41, 42, 43)
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44. A hard disc drive comprising:
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i) a read/write head and ii) a spindle motor, the spindle motor comprising;
a) a baseplate made of stiff thermoplastic material, having a modulas of elasticity of at least 1,000,000 psi at 25°
C., and a metal plate substantially encapsulated by the stiff thermoplastic material;
b) a shaft supported by said baseplate;
c) a stator assembly comprising i) a core having poles and ii) windings around said poles;
d) a hub supported on said shaft, said hub having a magnet connected thereto in operable proximity to the stator assembly; and
e) a vibration dampening thermoplastic material encapsulating the stator windings, the vibration dampening thermoplastic material having a vibration dampening ratio of at least 0.05 in the range of 0-500 Hz and joining the stator assembly to the baseplate. - View Dependent Claims (45, 46, 47, 48, 49, 50, 51)
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52. A spindle motor comprising:
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a) a baseplate;
b) a shaft supported by said baseplate;
c) a stator assembly comprising i) a core having poles and ii) windings around said poles, the baseplate and stator assembly not being in direct contact with one another but rather the stator assembly being spaced from the baseplate;
d) a hub supported on said shaft, wherein the hub comprises a hard drive disc support member, said hub having a magnet connected thereto in operable proximity to the stator assembly; and
e) a thermoplastic material secured to the baseplate and substantially encapsulating the stator windings, the thermoplastic material joining the stator assembly to the baseplate in the space between the stator assembly and the baseplate, filling in the space between them such that the windings, core and baseplate are rigidly fixed together.
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53. A spindle motor comprising:
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a) a baseplate comprising a stiff thermoplastic material, having a modulas of elasticity of at least 1,000,000 psi, and a metal plate substantially encapsulated in the stiff thermoplastic material;
b) a shaft supported by said baseplate;
c) a stator assembly comprising i) a core having poles and ii) windings around said poles, the baseplate and stator assembly not being in direct contact with one another but rather the stator assembly being spaced from the baseplate;
d) a hub supported on said shaft, said hub having a magnet connected thereto in operable proximity to the stator assembly; and
e) a thermoplastic material secured to the baseplate and substantially encapsulating the stator windings, the thermoplastic material joining the stator assembly to the baseplate in the space between the stator assembly and the baseplate, filling in the space between them such that the windings, core and baseplate are rigidly fixed together. - View Dependent Claims (54)
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Specification