US4900958A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drive motor for magnetic disks, optical disks, and magneto-optical disks
Assignee: Shinano Tokki Corp
•
Filing: 1988-07-25
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Granted: 1990-02-13
•
Expires: 2008-07-25
Abstract
Abstract A motor for rotating a magnetic disk, an optical disk, or a magneto-optical disk comprises an armature concentrically secured to a center shaft affixed to the base frame of a disk drive unit. A rotor frame is rotatably supported in a cantilever fashion on a free end of the center shaft by a pair of bearings. The rotor frame is cup-shaped with a depending cylindrical sidewall encircling the outer peripheral surface of the armature. The sidewall includes a disk support that projects outwardly from the sidewall. A permanent magnet secured inside the sidewall interacts with magnetic fields produced by the armature. The cantilever support makes it easier to bring armature leads through a hole in the mounting frame as a part of the manufacturing process. In an alternate embodiment, the center shaft is shortened so that the lower bearing on the shaft rests upon the frame. The cup-shaped rotor is mounted on the bearings with a hub having a depending cylindrical wall mounted on the lower bearing. The frame has an upstanding cylindrical wall encircling the depending cylindrical wall of the hub. The armature is mounted on the outer surface of the upstanding wall so that it encircles the lower bearing. This embodiment has a short axial length which produces a compact motor.
Inventors
- 👤 Haruo Kitahara
- 👤 Takeshi Ohshita
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:56
CPC Classifications
H; H02; H02K; H02K5/00; H02K5/04; H02K5/16; H02K5/173; H02K5/1737; F; F16; F16C; F16C19/00; F16C19/54; G; G11; G11B; G11B19/00; G11B19/20; G11B19/2009; H02K29/00; H02K29/06; H02K29/08; F16C2370/00; F16C2370/12; H02K21/00; H02K21/12; H02K21/22
Claims Analysis
Total Claims: 54
Claim 1
Independent Claim
220 words
A motor, suitable for driving a magnetic disk, an optical disk, or a magneto-optical disk, which comprises: a. a frame having a planar bottom member; b. an upstanding shaft on said planar bottom member, said upstanding shaft having a large diameter lower portion, an intermediate diameter middle portion and a small diameter upper portion; c. an aperture in said planar bottom member; d. a core mounted on said upstanding shaft on said middle portion and seated against said lower portion proximate said planar bottom member; e. an armature wound on said core and energizable by receiving electrical energy from wires passing to said armature through said aperture; f. a pair of spaced apart bearings mounted on said upstanding shaft on said upper portion above said armature; g. a cup shaped rotor mounted on said bearings to allow said rotor to rotate about said upstanding shaft and armature, said rotor having a cylindrical open bottom encompassing said armature, and said rotor including disk support means for mounting a disk on said rotor in a plane perpendicular to the axis of said upstanding shaft; and h. a plurality of permanent magnets mounted within said cup shaped rotor proximate to and spaced from said armature in magnetic engagement, whereby said rotor rotates about the upstanding shaft and armature when said armature is energized.
Claim 2
Dependent Claim
220 words
A motor, suitable for driving a magnetic disk, an optical disk, or a magneto-optical disk, which comprises: a. a frame having a planar bottom member; b. an upstanding shaft on said planar bottom member, said upstanding shaft having a large diameter lower portion, an intermediate diameter middle portion and a small diameter upper portion; c. an aperture in said planar bottom member; d. a core mounted on said upstanding shaft on said middle portion and seated against said lower portion proximate said planar bottom member; e. an armature wound on said core and energizable by receiving electrical energy from wires passing to said armature through said aperture; f. a pair of spaced apart bearings mounted on said upstanding shaft on said upper portion above said armature; g. a cup shaped rotor mounted on said bearings to allow said rotor to rotate about said upstanding shaft and armature, said rotor having a cylindrical open bottom encompassing said armature, and said rotor including disk support means for mounting a disk on said rotor in a plane perpendicular to the axis of said upstanding shaft; and h. a plurality of permanent magnets mounted within said cup shaped rotor proximate to and spaced from said armature in magnetic engagement, whereby said rotor rotates about the upstanding shaft and armature when said armature is energized.
Claim 3
Dependent Claim
15 words
A motor according to claim 1 wherein said bearings are spaced apart by spring elements.
Claim 4
Dependent Claim
13 words
A motor according to claim 2 wherein said spring elements are Belleville springs.
Claim 5
Dependent Claim
16 words
A motor according to claim 1 wherein said bearings are spaced apart by an annular spacer.
Claim 6
Dependent Claim
14 words
A motor according to claim 4 wherein said annular spacer is an annular ring.
Claim 7
Dependent Claim
14 words
A motor according to claim 5 wherein said annular ring comprises an annular segment.
Claim 8
Dependent Claim
16 words
A motor according to claim 5 wherein said annular ring comprises a plurality of annular segments.
Claim 9
Dependent Claim
23 words
A motor according to claim 4 wherein said annular spacer comprises an annular projection on the inside surface of said cup shaped rotor.
Claim 10
Dependent Claim
46 words
A motor according to claim 11 wherein said disk support means comprises an annular projection on the outside of said open bottom of the cup shaped rotor, and said annular projection has an upper surface in a plane perpendicular to the axis of said upstanding shaft.
Claim 11
Dependent Claim
29 words
A motor according to claim 9 wherein said rotor has a cylindrical outer surface above said annular projection, whereby a plurality of disks may be mounted on said rotor.
Claim 12
Dependent Claim
267 words
A motor, suitable for driving a magnetic disk, an optical disk, or a magneto-optical disk, which comprises: a. a frame having a planar bottom member; b. an upstanding shaft on said planar bottom member, said upstanding shaft including a lower portion having a central bore and a post having upper and lower portions, said post lower portion being secured within said central bore, and said post upper portion having an outer surface having two spaced apart circumferential recesses for providing bearing inner races; c. an aperture in said planar bottom member; d. upper and lower spaced apart bearings mounted on said post upper portion and in said recesses proximate said planar bottom member; e. a cup shaped rotor having a central hub mounted on said bearings to allow said rotor to rotate about said upstanding shaft, said central hub including a depending cylindrical wall portion mounted on said lower bearing; f. an upstanding cylindrical wall on said planar bottom member, spaced from and encircling said depending cylindrical wall portion of said rotor central hub; g. a core mounted on the outside surface of said upstanding cylindrical wall; h. an armature wound on said core and energizable by receiving electrical energy from wires passing to said armature through said aperture; i. a depending outer cylindrical wall on said rotor, spaced from and encircling said armature; and, j. a plurality of permanent magnets mounted on the inside surface of said rotor outer cylindrical wall proximate to and spaced from said armature in magnetic engagement, whereby said rotor rotates about said upstanding shaft and armature when said armature is energized.
Claim 13
Dependent Claim
267 words
A motor, suitable for driving a magnetic disk, an optical disk, or a magneto-optical disk, which comprises: a. a frame having a planar bottom member; b. an upstanding shaft on said planar bottom member, said upstanding shaft including a lower portion having a central bore and a post having upper and lower portions, said post lower portion being secured within said central bore, and said post upper portion having an outer surface having two spaced apart circumferential recesses for providing bearing inner races; c. an aperture in said planar bottom member; d. upper and lower spaced apart bearings mounted on said post upper portion and in said recesses proximate said planar bottom member; e. a cup shaped rotor having a central hub mounted on said bearings to allow said rotor to rotate about said upstanding shaft, said central hub including a depending cylindrical wall portion mounted on said lower bearing; f. an upstanding cylindrical wall on said planar bottom member, spaced from and encircling said depending cylindrical wall portion of said rotor central hub; g. a core mounted on the outside surface of said upstanding cylindrical wall; h. an armature wound on said core and energizable by receiving electrical energy from wires passing to said armature through said aperture; i. a depending outer cylindrical wall on said rotor, spaced from and encircling said armature; and, j. a plurality of permanent magnets mounted on the inside surface of said rotor outer cylindrical wall proximate to and spaced from said armature in magnetic engagement, whereby said rotor rotates about said upstanding shaft and armature when said armature is energized.
Claim 14
Dependent Claim
219 words
A motor, suitable for driving a magnetic disk, an optical disk, or a magneto-optical disk, which comprises: a. a frame having a planar bottom member; b. an upstanding shaft on said planar bottom member, said upstanding shaft including a lower portion having a central bore and a post having upper and lower portions, and said post lower portion being secured within said central bore; c. an aperture in said planar bottom member; d. a core mounted on said upstanding shaft lower portion proximate said planar bottom member; e. an armature wound on said core and energizable by receiving electrical energy from wires passing to said armature through said aperture; f. a pair of spaced apart bearings mounted on said post upper portion above said armature; g. a cup shaped rotor mounted on said bearings to allow said rotor to rotate about said upstanding shaft and armature, said rotor having a cylindrical open bottom encompassing said armature, and said rotor including disk support means for mounting a disk on said rotor in a plane perpendicular to the axis of said upstanding shaft; and h. a plurality of permanent magnets mounted within said cup shaped rotor proximate to and spaced from said armature in magnetic engagement, whereby said rotor rotates about the upstanding shaft and armature when said armature is energized.
Claim 15
Dependent Claim
219 words
A motor, suitable for driving a magnetic disk, an optical disk, or a magneto-optical disk, which comprises: a. a frame having a planar bottom member; b. an upstanding shaft on said planar bottom member, said upstanding shaft including a lower portion having a central bore and a post having upper and lower portions, and said post lower portion being secured within said central bore; c. an aperture in said planar bottom member; d. a core mounted on said upstanding shaft lower portion proximate said planar bottom member; e. an armature wound on said core and energizable by receiving electrical energy from wires passing to said armature through said aperture; f. a pair of spaced apart bearings mounted on said post upper portion above said armature; g. a cup shaped rotor mounted on said bearings to allow said rotor to rotate about said upstanding shaft and armature, said rotor having a cylindrical open bottom encompassing said armature, and said rotor including disk support means for mounting a disk on said rotor in a plane perpendicular to the axis of said upstanding shaft; and h. a plurality of permanent magnets mounted within said cup shaped rotor proximate to and spaced from said armature in magnetic engagement, whereby said rotor rotates about the upstanding shaft and armature when said armature is energized.
Claim 16
Dependent Claim
35 words
A motor according to claim 12 wherein said post upper portion has a diameter greater than said post lower portion and said post upper portion is seated against the end of said shaft lower portion.
Claim 17
Dependent Claim
24 words
A motor according to claim 12 wherein said post upper portion has an outer surface having recesses providing the inner races of said bearings.
Claim 18
Dependent Claim
15 words
A motor according to claim 1 wherein said aperture is located proximate said upstanding shaft.
Claim 19
Dependent Claim
35 words
A motor according to claim 1 wherein said permanent magnets are disposed angularly on an inside surface of said rotor so as to present alternate north and south poles in magnetic engagement with said armature.
Claim 20
Dependent Claim
22 words
A motor according to claim 1 including at least one side wall in the shape of a segment of a hollow cylinder.
Claim 21
Dependent Claim
271 words
A motor, suitable for driving a magnetic disk, an optical disk, or a magneto-optical disk, which comprises: a. a frame having a planar bottom member; b. an upstanding shaft on said planar bottom member, said upstanding shaft including a lower portion having a central bore and a post having upper and lower portions, said post upper portion having a diameter greater than said post lower portion, said post lower portion being secured within said central bore, and said post upper portion being seated against the end of said shaft lower portion; c. an aperture in said planar bottom member; d. upper and lower spaced apart bearings mounted on said post upper portion proximate said planar bottom member; e. a cup shaped rotor having a central hub mounted on said bearings to allow said rotor to rotate about said upstanding shaft, said central hub including a depending cylindrical wall portion mounted on said lower bearing; f. an upstanding cylindrical wall on said planar bottom member, spaced from and encircling said depending cylindrical wall portion of said rotor central hub; g. a core mounted on the outside surface of said upstanding cylindrical wall; h. an armature wound on said core and energizable by receiving electrical energy from wires passing to said armature through said aperture; i. a depending outer cylindrical wall on said rotor, spaced from and encircling said armature; and, j. a plurality of permanent magnets mounted on the inside surface of said rotor outer cylindrical wall proximate to and spaced from said armature in magnetic engagement, whereby said rotor rotates about said upstanding shaft and armature when said armature is energized.
Claim 22
Dependent Claim
271 words
A motor, suitable for driving a magnetic disk, an optical disk, or a magneto-optical disk, which comprises: a. a frame having a planar bottom member; b. an upstanding shaft on said planar bottom member, said upstanding shaft including a lower portion having a central bore and a post having upper and lower portions, said post upper portion having a diameter greater than said post lower portion, said post lower portion being secured within said central bore, and said post upper portion being seated against the end of said shaft lower portion; c. an aperture in said planar bottom member; d. upper and lower spaced apart bearings mounted on said post upper portion proximate said planar bottom member; e. a cup shaped rotor having a central hub mounted on said bearings to allow said rotor to rotate about said upstanding shaft, said central hub including a depending cylindrical wall portion mounted on said lower bearing; f. an upstanding cylindrical wall on said planar bottom member, spaced from and encircling said depending cylindrical wall portion of said rotor central hub; g. a core mounted on the outside surface of said upstanding cylindrical wall; h. an armature wound on said core and energizable by receiving electrical energy from wires passing to said armature through said aperture; i. a depending outer cylindrical wall on said rotor, spaced from and encircling said armature; and, j. a plurality of permanent magnets mounted on the inside surface of said rotor outer cylindrical wall proximate to and spaced from said armature in magnetic engagement, whereby said rotor rotates about said upstanding shaft and armature when said armature is energized.
Claim 23
Dependent Claim
15 words
A motor according to claim 18 wherein said bearings are spaced apart by spring elements.
Claim 24
Dependent Claim
13 words
A motor according to claim 19 wherein said spring elements are Belleville springs.
Claim 25
Dependent Claim
16 words
A motor according to claim 18 wherein said bearings are spaced apart by an annular spacer.
Claim 26
Dependent Claim
14 words
A motor according to claim 21 wherein said annular spacer is an annular ring.
Claim 27
Dependent Claim
14 words
A motor according to claim 22 wherein said annular ring comprises an annular segment.
Claim 28
Dependent Claim
16 words
A motor according to claim 22 wherein said annular ring comprises a plurality of annular segments.
Claim 29
Dependent Claim
23 words
A motor according to claim 21 wherein said annular spacer comprises an annular projection on the inside surface of said rotor central hub.
Claim 30
Dependent Claim
33 words
A motor according to claim 18 wherein said cup shaped rotor includes disk support means for mounting a disk on said rotor in a plane perpendicular to the axis of said upstanding shaft.
Claim 31
Dependent Claim
14 words
A motor according to claim 1 wherein said aperture is located proximate said armature.
Claim 32
Dependent Claim
34 words
The motor of claim 1 wherein said permanent magnets are disposed angularly on the inside surface of said rotor so as to present alternate north and south poles in magnetic engagement with said armature.
Claim 33
Dependent Claim
33 words
A motor according to claim 11 wherein said cup shaped rotor includes disk support means for mounting a disk on said rotor in a plane perpendicular to the axis of said upstanding shaft.
Claim 34
Dependent Claim
14 words
A motor according to claim 11 wherein said aperture is located proximate said armature.
Claim 35
Dependent Claim
34 words
The motor of claim 11 wherein said permanent magnets are disposed angularly on the inside surface of said rotor so as to present alternate north and south poles in magnetic engagement with said armature.
Claim 36
Dependent Claim
15 words
A motor according to claim 12 wherein said bearings are spaced apart by spring elements.
Claim 37
Dependent Claim
13 words
A motor according to claim 32 wherein said spring elements are Belleville springs.
Claim 38
Dependent Claim
16 words
A motor according to claim 12 wherein said bearings are spaced apart by an annular spacer.
Claim 39
Dependent Claim
14 words
A motor according to claim 34 wherein said annular spacer is an annular ring.
Claim 40
Dependent Claim
14 words
A motor according to claim 35 wherein said annular ring comprises an annular segment.
Claim 41
Dependent Claim
16 words
A motor according to claim 35 wherein said annular ring comprises a plurality of annular segments.
Claim 42
Dependent Claim
23 words
A motor according to claim 34 wherein said annular spacer comprises an annular projection on the inside surface of said cup shaped rotor.
Claim 43
Dependent Claim
46 words
A motor according to claim 12 wherein said disk support means comprises an annular projection on the outside of said open bottom of the cup shaped rotor, and said annular projection has an upper surface in a plane perpendicular to the axis of said upstanding shaft.
Claim 44
Dependent Claim
29 words
A motor according to claim 39 wherein said rotor has a cylindrical outer surface above said annular projection, whereby a plurality of disks may be mounted on said rotor.
Claim 45
Dependent Claim
15 words
A motor according to claim 12 wherein said aperture is located proximate said upstanding shaft.
Claim 46
Dependent Claim
35 words
A motor according to claim 12 wherein said permanent magnets are disposed angularly on an inside surface of said rotor so as to present alternate north and south poles in magnetic engagement with said armature.
Claim 47
Dependent Claim
22 words
A motor according to claim 12 including at least one side wall in the shape of a segment of a hollow cylinder.
Claim 48
Dependent Claim
15 words
A motor according to claim 11 wherein said bearings are spaced apart by spring elements.
Claim 49
Dependent Claim
13 words
A motor according to claim 44 wherein said spring elements are Belleville springs.
Claim 50
Dependent Claim
16 words
A motor according to claim 11 wherein said bearings are spaced apart by an annular spacer.
Claim 51
Dependent Claim
14 words
A motor according to claim 46 wherein said annular spacer is an annular ring.
Claim 52
Dependent Claim
14 words
A motor according to claim 47 wherein said annular ring comprises an annular segment.
Claim 53
Dependent Claim
16 words
A motor according to claim 47 wherein said annular ring comprises a plurality of annular segments.
Claim 54
Dependent Claim
23 words
A motor according to claim 46 wherein said annular spacer comprises an annular projection on the inside surface of said rotor central hub.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-02-12 | 1993-08-14 | 1994-02-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-02-12 | 1997-08-14 | 1998-02-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-02-12 | 2001-08-14 | 2002-02-13 | $7700.00 | Window Closed / Lapsed |