Patent US5391952A successfully refreshed from Google Patents.
US5391952A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Balanced miniature motor
Assignee: Nidec Corp
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Filing: 1992-09-04
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Granted: 1995-02-21
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Expires: 2012-09-04
Abstract
Abstract A structure of a balance adjusting mechanism of the rotor casing of a miniature motor for driving a magnetic disc is provided. The miniature motor comprises: a hub carrying a driving magnet on its inner circumference and adapted to mount a magnetic disc on its outer circumference; a stator core having a coil wound thereon to face the driving magnet of the hub; a frame having a holder for fixing the stator core; a balance adjusting groove formed in the inner circumference of the hub and adjoining the driving magnet; and a balance correcting weight mounted in the balance adjusting groove.
Inventors
- 👤 Kunio Simazu
- 👤 Shinji Kinosita
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 14:11
CPC Classifications
H; H02; H02K; H02K7/00; H02K7/04; G; G01; G01M; G01M1/00; G01M1/30; G01M1/36; H02K21/00; H02K21/12; H02K21/22; H02K21/24
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
85 words
A balanced miniature motor for driving a magnetic disc, comprising: a hub carrying a driving magnet on its inner circumference and adapted to mount a magnetic disc on its outer circumference; a stator core having a coil wound thereon to face the driving magnet of said hub; a frame having a holder for fixing said stator core; a balance adjusting groove formed in the inner circumference of said hub and adjoining said driving magnet; and a balance correcting weight mounted in said balance adjusting groove.
Claim 2
Dependent Claim
85 words
A balanced miniature motor for driving a magnetic disc, comprising: a hub carrying a driving magnet on its inner circumference and adapted to mount a magnetic disc on its outer circumference; a stator core having a coil wound thereon to face the driving magnet of said hub; a frame having a holder for fixing said stator core; a balance adjusting groove formed in the inner circumference of said hub and adjoining said driving magnet; and a balance correcting weight mounted in said balance adjusting groove.
Claim 3
Dependent Claim
41 words
A balanced miniature motor according to claim 1, further comprising a cup-shaped rotor casing forming said hub as its portion, wherein said balance adjusting groove is circumferentially formed in said cup-shaped rotor casing so as to have predetermined depth and width.
Claim 4
Dependent Claim
32 words
A balanced miniature motor according to claim 2, wherein said balance adjusting groove has an opening and a bottom and is made narrower in section at its opening than at its bottom.
Claim 5
Dependent Claim
39 words
A balanced miniature motor according to claim 1, wherein said balance correcting weight is provided from a material having substantially uniform weight per unit length and said balance correction weight is cut to a predetermined length for said motor.
Claim 6
Dependent Claim
18 words
A balanced miniature motor according to claim 1, wherein said balance correcting weight is made of wire solder.
Claim 7
Dependent Claim
100 words
A balanced miniature motor for driving a magnetic disc, comprising: a hub adapted to mount a magnetic disc on its outer circumference; a cup-shaped rotor casing carrying said hub and made rotatable together with the hub; a driving magnet mounted on the inner circumference of said rotor casing; a stator core having a coil wound thereon to face said driving magnet; a frame having a holder for holding said stator core; a balance adjusting groove formed in the inner circumference of said rotor casing and adjoining said driving magnet; and a balance correcting weight mounted in said balance adjusting groove.
Claim 8
Dependent Claim
100 words
A balanced miniature motor for driving a magnetic disc, comprising: a hub adapted to mount a magnetic disc on its outer circumference; a cup-shaped rotor casing carrying said hub and made rotatable together with the hub; a driving magnet mounted on the inner circumference of said rotor casing; a stator core having a coil wound thereon to face said driving magnet; a frame having a holder for holding said stator core; a balance adjusting groove formed in the inner circumference of said rotor casing and adjoining said driving magnet; and a balance correcting weight mounted in said balance adjusting groove.
Claim 9
Dependent Claim
81 words
A balanced miniature motor comprising: a cup-shaped rotor casing; a stator core having a coil wound thereon for facing a driving magnet of said rotor casing; a driving magnet mounted on the inner circumference of said rotor casing and arranged to face said stator core; a frame holding said stator core thereon; a balance adjusting groove formed in the inner circumference of said rotor casing and adjoining said driving magnet; and a balance correcting weight mounted in said balance adjusting groove.
Claim 10
Dependent Claim
81 words
A balanced miniature motor comprising: a cup-shaped rotor casing; a stator core having a coil wound thereon for facing a driving magnet of said rotor casing; a driving magnet mounted on the inner circumference of said rotor casing and arranged to face said stator core; a frame holding said stator core thereon; a balance adjusting groove formed in the inner circumference of said rotor casing and adjoining said driving magnet; and a balance correcting weight mounted in said balance adjusting groove.
Claim 11
Dependent Claim
76 words
A balanced miniature motor comprising: a cup-shaped rotor casing; a ring-shaped magnet for facing a driving magnet of said rotor casing; a driving magnet mounted to a bottom surface of said rotor casing and arranged to face said ring-shaped magnet; a frame holding said ring-shaped magnet thereon; a balance adjusting groove formed in an inner circumference of said rotor casing and adjoining said driving magnet; and a balance correcting weight mounted in said balance adjusting groove.
Claim 12
Dependent Claim
76 words
A balanced miniature motor comprising: a cup-shaped rotor casing; a ring-shaped magnet for facing a driving magnet of said rotor casing; a driving magnet mounted to a bottom surface of said rotor casing and arranged to face said ring-shaped magnet; a frame holding said ring-shaped magnet thereon; a balance adjusting groove formed in an inner circumference of said rotor casing and adjoining said driving magnet; and a balance correcting weight mounted in said balance adjusting groove.
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) | 1998-02-20 | 1998-08-22 | 1999-02-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-02-20 | 2002-08-22 | 2003-02-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-02-20 | 2006-08-22 | 2007-02-21 | $7700.00 | Window Closed / Lapsed |