High speed spindle motor with hydrodynamic bearings
First Claim
1. A high speed spindle motor comprising:
- a) a stator assembly comprising a stator having multiple conductors that create a plurality of magnetic fields when electrical current is conducted through the conductors and a body of a phase change material having a coefficient of linear thermal expansion of less than 2×
10−
5 in/in/°
F. throughout the range of 0-250°
F. encapsulating the stator;
b) a rotatable hub having a magnet connected thereto in operable proximity to the stator;
c) a shaft; and
d) a hydrodynamic bearing surrounding the shaft, one of the bearing or shaft being fixed to the stator assembly and the other of the bearing or shaft being fixed to the hub.
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Accused Products
Abstract
The present invention is directed to a high speed spindle motor comprising a stator assembly including a stator having multiple conductors that create a plurality of magnetic fields when electrical current is conducted by the conductors and a body of a phase change material such as a thermoplastic substantially encapsulating the stator. A rotatable hub having a magnet connected thereto is in operable proximity to the stator. The high speed motor also includes a shaft, a bearing surrounding the shaft and one of the bearing or shaft being fixed to the stator assembly and the other of the bearing or shaft being fixed to the rotatable hub. Hard disc drives using the motor, and methods of developing and constructing the motor and hard disc drives are also disclosed.
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Citations
20 Claims
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1. A high speed spindle motor comprising:
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a) a stator assembly comprising a stator having multiple conductors that create a plurality of magnetic fields when electrical current is conducted through the conductors and a body of a phase change material having a coefficient of linear thermal expansion of less than 2×
10−
5 in/in/°
F. throughout the range of 0-250°
F. encapsulating the stator;
b) a rotatable hub having a magnet connected thereto in operable proximity to the stator;
c) a shaft; and
d) a hydrodynamic bearing surrounding the shaft, one of the bearing or shaft being fixed to the stator assembly and the other of the bearing or shaft being fixed to the hub. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A high speed spindle motor comprising:
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a) a stator assembly comprising;
i) a stator having multiple conductors that create a plurality of magnetic fields when electrical current is conducted by the conductors; and
ii) a body of a phase change material substantially encapsulating the stator;
b) a rotatable hub having a magnet connected thereto in operable proximity to the stator;
c) a hydrodynamic bearing allowing the hub to rotate with respect to the stator assembly; and
d) a solid insert substantially encapsulated within the body, the insert enhancing heat transfer away from the bearing and the stator. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. A high speed spindle motor comprising:
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a) a stator assembly comprising;
i) a stator having multiple conductors that create a plurality of magnetic fields when electrical current is conducted by the conductors;
ii) a body of phase change material substantially encapsulating the conductors, the phase change material having a thermal conductivity of at least 0.7 watts/meter°
K;
b) a rotatable hub having a magnet connected thereto in operable proximity to the stator; and
c) a hydrodynamic bearing allowing the hub to rotate with respect to the stator assembly. - View Dependent Claims (18, 19, 20)
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Specification