Patent US4677335A successfully refreshed from Google Patents.
US4677335A
Expired / Lapsed
US
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Axial gap type coreless electric motor with noise reduction
Assignee: Panasonic Holdings Corp
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Filing: 1985-09-20
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Granted: 1987-06-30
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Expires: 2005-09-20
Abstract
Abstract In an axial gap type coreless electric motor, a frame bracket (16), which is disposed facing a field magnet (12) with a rotary armature (14) inserted in between, has radial ribs (19) formed outside thereof and disposed radially from a central part to a peripheral part of the frame bracket. The ribs are tapered, with their heights and widths gradually narrowed from the center part to the peripheral parts of the frame bracket.
Inventors
- 👤 Takemi Ueda
- 👤 Norio Umezawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 19:22
CPC Classifications
H; H02; H02K; H02K5/00; H02K5/24; H02K23/00; H02K23/54; H02K5/04; H02K5/18
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
94 words
An axial gap type coreless electric motor comprising: a flat disk type coreless armature rotatably disposed with a small gap against a field magnet, a frame bracket which serves as a magnetic yoke and is disposed on an opposite side of said armature against said field magnet with a predetermined small gap in between, said frame bracket having radial ribs formed radially on the outer face of said frame bracket, and centering around a rotor shaft which is connected with said armature, wherein said ribs are disposed over non-magnetized parts of said field magnet.
Claim 2
Dependent Claim
94 words
An axial gap type coreless electric motor comprising: a flat disk type coreless armature rotatably disposed with a small gap against a field magnet, a frame bracket which serves as a magnetic yoke and is disposed on an opposite side of said armature against said field magnet with a predetermined small gap in between, said frame bracket having radial ribs formed radially on the outer face of said frame bracket, and centering around a rotor shaft which is connected with said armature, wherein said ribs are disposed over non-magnetized parts of said field magnet.
Claim 3
Dependent Claim
119 words
An axial gap type coreless electric motor comprising: a flat disk type coreless armature rotatably disposed with a small gap against a field magnet, a frame bracket which serves as a magnetic yoke and is disposed on an opposite side of said armature against said field magnet with a predetermined small gap in between, said frame bracket having radial ribs formed radially on the outer face of said frame bracket, and centering around a rotor shaft which is connected with said armature, wherein said ribs are disposed over non-magnetized parts of said field magnet and include sub-ribs which are also disposed radially between said radial ribs, hence, over parts of center lines of magnet poles of said field magnet.
Claim 4
Dependent Claim
119 words
An axial gap type coreless electric motor comprising: a flat disk type coreless armature rotatably disposed with a small gap against a field magnet, a frame bracket which serves as a magnetic yoke and is disposed on an opposite side of said armature against said field magnet with a predetermined small gap in between, said frame bracket having radial ribs formed radially on the outer face of said frame bracket, and centering around a rotor shaft which is connected with said armature, wherein said ribs are disposed over non-magnetized parts of said field magnet and include sub-ribs which are also disposed radially between said radial ribs, hence, over parts of center lines of magnet poles of said field magnet.
Claim 5
Dependent Claim
37 words
An axial gap type coreless electric motor in accordance with claim 1 or claim 2, wherein: said ribs are tapered with their widths gradually narrowed from a center part to a peripheral part of said frame bracket.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-06-29 | 1990-12-29 | 1991-06-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-06-29 | 1994-12-29 | 1995-06-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-06-29 | 1998-12-29 | 1999-06-30 | $7700.00 | Window Closed / Lapsed |