US5218253A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spin motor for a hard disk assembly
Assignee: HSP (BVI) NOMINEES Ltd
•
Filing: 1990-12-19
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Granted: 1993-06-08
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Expires: 2010-12-19
Abstract
Abstract A spin motor assembly of a disk drive apparatus includes a stator having a plurality of wound coils associated therewith, and a rotor having a plurality of magnetic poles. Each winding structure of the stator is made up of two winding portions, with only one winding portion being used to drive the rotor relative to the stator upon drive current being applied to the winding structure, but with both winding portions being used to generate back electromotive force when drive current is cut off from the winding structure. This generated electromotive force is used to actuate an actuator motor to unload the read-write heads from the disk surface. As an alternative, each winding structure of the stator is made of a single winding, and the winding structures are used successively to drive the rotor relative to the stator, but with at least two winding portions generating back electromotive force when drive current is cut off.
Inventors
- 👤 James H. Morehouse
- 👤 James A. Dunckley
- 👤 David M. Furay
- 👤 Michael R. Utenick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 14:33
CPC Classifications
G; G11; G11B; G11B19/00; G11B19/20; H; H02; H02K; H02K21/00; H02K21/12; H02K21/22; H02K3/00; H02K3/04; H02K3/18; H02K3/20
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
117 words
A drive apparatus comprising: a motor having a stator and a rotor, one of said stator and rotor having a plurality of magnetic poles and the other of said stator and rotor having at least one winding structure, the winding structure comprising a first winding portion and a second winding portion; means for providing that only the first winding portion of said winding structure is used in driving the rotor relative to the stator when drive current is applied to said winding structure; and means for providing that both the first and second winding portions of said winding structure are simultaneously used to generate back electromotive force when drive current is cut off from the winding structure.
Claim 2
Dependent Claim
117 words
A drive apparatus comprising: a motor having a stator and a rotor, one of said stator and rotor having a plurality of magnetic poles and the other of said stator and rotor having at least one winding structure, the winding structure comprising a first winding portion and a second winding portion; means for providing that only the first winding portion of said winding structure is used in driving the rotor relative to the stator when drive current is applied to said winding structure; and means for providing that both the first and second winding portions of said winding structure are simultaneously used to generate back electromotive force when drive current is cut off from the winding structure.
Claim 3
Dependent Claim
16 words
The apparatus of claim 1 wherein the first and second winding portions are in side-by-side relation.
Claim 4
Dependent Claim
18 words
The apparatus of claim 1 wherein one of the winding portions is wound over an other winding portion.
Claim 5
Dependent Claim
14 words
The apparatus of claim 1 wherein the first and second winding portions are bifilar.
Claim 6
Dependent Claim
35 words
The apparatus of claim 1 and further comprising actuator means, and means for applying the generated back electromotive force, generated by the first and second winding portions of said winding structure, to said actuator means.
Claim 7
Dependent Claim
13 words
The apparatus of claim 5 wherein the actuator means comprise an actuator motor.
Claim 8
Dependent Claim
126 words
A drive apparatus comprising: a motor having a stator and a rotor, one of said stator and rotor having a plurality of magnetic poles and the other of said stator and rotor having a plurality of winding structures, each winding structure wound about a respective associated core, each winding structure comprising a first winding portion and a second winding portion; means for providing that only the first winding portion of each winding structure is used in driving the rotor relative to the stator when drive current is applied to that winding structure; and means for providing that both the first and second winding portions of each winding structure are simultaneously used to generate back electromotive force when drive current is cut off from that winding structure.
Claim 9
Dependent Claim
126 words
A drive apparatus comprising: a motor having a stator and a rotor, one of said stator and rotor having a plurality of magnetic poles and the other of said stator and rotor having a plurality of winding structures, each winding structure wound about a respective associated core, each winding structure comprising a first winding portion and a second winding portion; means for providing that only the first winding portion of each winding structure is used in driving the rotor relative to the stator when drive current is applied to that winding structure; and means for providing that both the first and second winding portions of each winding structure are simultaneously used to generate back electromotive force when drive current is cut off from that winding structure.
Claim 10
Dependent Claim
21 words
The apparatus of claim 7 wherein the first and second winding portions are wound in side-by-side relation about said associated core.
Claim 11
Dependent Claim
27 words
The apparatus of claim 7 wherein one of the winding portions is wound about an other winding portion, which is in turn wound about said associated core.
Claim 12
Dependent Claim
14 words
The apparatus of claim 7 wherein the first and second winding portions are bifilar.
Claim 13
Dependent Claim
30 words
The apparatus of claim 7 and further comprising an actuator motor, and means for applying the back electromotive force generated by each of the winding structures to said actuator motor.
Claim 14
Dependent Claim
23 words
The apparatus of claim 7 wherein the stator has said plurality of winding structures, and the rotor has said plurality of magnetic poles.
Claim 15
Dependent Claim
13 words
The apparatus of claim 7 wherein said motor is a 12-pole, 3-phase motor.
Claim 16
Dependent Claim
95 words
A drive apparatus comprising: a motor having a stator and a rotor, one of said stator and rotor having a plurality of magnetic poles and an other of said stator and rotor having a plurality of winding structures; means for providing that the winding structures are used successively in driving the rotor relative to the stator when drive current is applied to chosen winding structures; and means for providing that at least a pair of winding structures are simultaneously used to generate back electromotive force when drive current is cut off from the winding structures.
Claim 17
Dependent Claim
95 words
A drive apparatus comprising: a motor having a stator and a rotor, one of said stator and rotor having a plurality of magnetic poles and an other of said stator and rotor having a plurality of winding structures; means for providing that the winding structures are used successively in driving the rotor relative to the stator when drive current is applied to chosen winding structures; and means for providing that at least a pair of winding structures are simultaneously used to generate back electromotive force when drive current is cut off from the winding structures.
Claim 18
Dependent Claim
25 words
The apparatus of claim 14 wherein said drive apparatus is a three-phase motor, and wherein each winding structure is a phase winding of said motor.
References Cited (Backward Citations)
US3624675A
Cited
US3670189A
Cited
US5023527A
Cited
US3984873A
Cited
US4492903A
Cited
US4536691A
Cited
US4371903A
Cited
US4535374A
Cited
US4518904A
Cited
US4568988A
Cited
US4638383A
Cited
US4568988B1
Cited
US4638383B1
Cited
US4772974A
Cited
US4794293A
Cited
US4968911A
Cited
US4876491A
Cited
US4748385A
Cited
US4831469A
Cited
US4933785A
Cited
US5030864A
Cited
US5017845A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-06-07 | 1996-12-07 | 1997-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-06-07 | 2000-12-07 | 2001-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-06-07 | 2004-12-07 | 2005-06-08 | $7700.00 | Window Closed / Lapsed |