High speed spindle motor for disc drive
First Claim
1. A motor comprising:
- a) a shaft having a rotational axis;
b) a hub attached to the shaft and including a permanent magnet;
c) a bearing allowing rotation of the hub about the rotational axis of the shaft;
d) a stator comprising conductors;
e) a monolithically formed body that substantially encapsulates the stator conductors, wherein a thermoplastic material is injection molded to form the body and the body is configured to align the shaft, hub and bearing with respect to the stator, and mounting features are formed in the body to mount the motor to a device to be powered by the motor; and
f) an insert substantially encapsulated within the body, wherein the insert provides structural rigidity to the body.
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Accused Products
Abstract
A high speed spindle motor is constructed from 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 drive are also disclosed.
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Citations
51 Claims
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1. A motor comprising:
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a) a shaft having a rotational axis;
b) a hub attached to the shaft and including a permanent magnet;
c) a bearing allowing rotation of the hub about the rotational axis of the shaft;
d) a stator comprising conductors;
e) a monolithically formed body that substantially encapsulates the stator conductors, wherein a thermoplastic material is injection molded to form the body and the body is configured to align the shaft, hub and bearing with respect to the stator, and mounting features are formed in the body to mount the motor to a device to be powered by the motor; and
f) an insert substantially encapsulated within the body, wherein the insert provides structural rigidity to the body. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40)
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41. A motor comprising:
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a) a shaft;
b) a bearing surrounding the shaft;
c) windings acting as conductors; and
d) a monolithically formed body that substantially encapsulates at least a portion of the windings, wherein a thermoplastic material is injection molded to form the body, the material including aluminum oxide as a filler, the aluminum oxide comprising about 55% of the thermoplastic material. - View Dependent Claims (42, 43, 44, 45)
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46. A high speed spindle motor for a disc drive comprising:
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a) a shaft having a rotational axis;
b) a disc support member attached to the shaft and including a permanent magnet;
c) a bearing allowing rotation of the disc support member about the rotational axis of the shaft;
d) a stator; and
e) a monolithically formed body that substantially encapsulates the stator, wherein a thermoplastic material is injection molded to form the body and the body is configured to align the shaft, disc support member and bearing with respect to the stator, and wherein the shaft is fixed to the body and an insert is substantially encapsulated within the body and is positioned between the shaft and the bearing.
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47. A motor comprising:
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a) a shaft having a rotational axis;
b) a hub attached to the shaft and including a permanent magnet;
c) a bearing allowing rotation of the hub about the rotational axis of the shaft;
d) a stator comprising conductors;
e) a monolithically formed body that substantially encapsulates the stator conductors, wherein a thermoplastic material is injection molded to form the body and the body is configured to align the shaft, hub and bearing with respect to the stator, and mounting features are formed in the body to mount the motor to a device to be powered by the motor; and
f) an insert substantially encapsulated within the body wherein the insert enhances heat transfer away from the bearing and the stator.
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48. A motor comprising:
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a) a shaft having a rotational axis;
b) a hub attached to the shaft and including a permanent magnet;
c) a bearing allowing rotation of the hub about the rotatable axis of the shaft;
d) a stator comprising conductors;
e) a monolithically formed body that substantially encapsulates the stator conductors, wherein a thermoplastic material is injection molded to form the body and the body is configured to align the shaft, hub and bearing with respect to the stator; and
mounting features are formed in the body to mount the motor to a device to be powered by the motor; and
f) an insert substantially encapsulated within the body wherein the insert enhances dampening of motor vibration.
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49. A motor comprising:
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a) a shaft having a rotational axis;
b) a hub attached to the shaft and including a permanent magnet;
c) a bearing allowing rotation of the hub about the rotational axis of the shaft;
d) a stator comprising conductors;
e) a monolithically formed body that substantially encapsulates the stator conductors, wherein a thermoplastic material is injection molded to form the body and the body is configured to align the shaft, hub and bearing with respect to the stator, and mounting features are formed in the body to mount the motor to a device to be powered by the motor; and
f) an insert substantially encapsulated within the body wherein the insert enhances dampening of audible noise.
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50. A motor comprising:
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a) a shaft having a rotational axis;
b) a hub attached to the shaft and including a permanent magnet;
c) a bearing allowing rotation of the hub about the rotational axis of the shaft;
d) a stator comprising conductors;
e) a monolithically formed body that substantially encapsulates the stator conductors, wherein a thermoplastic material is injection molded to form the body and the body is configured to align the shaft, hub and bearing with respect to the stator; and
mounting features are formed in the body to mount the motor to a device to be powered by the motor; and
f) an insert substantially encapsulated within the body, wherein the shaft is fixed to the body and the insert is positioned between the shaft and the bearing.
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51. A motor comprising:
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a) a shaft;
b) a bearing surrounding the shaft;
c) windings acting as conductors; and
d) a monolithically formed body that substantially encapsulates at least a portion of the windings, wherein a thermoplastic material comprising polyphenyl sulfide is injection molded to form the body, the material including aluminum oxide as a filler.
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Specification