Patent US5068558A successfully refreshed from Google Patents.
US5068558A
Expired / Lapsed
US
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Magnetic bearing device
Assignee: Nippon Ferrofluidics Corp
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Filing: 1990-07-27
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Granted: 1991-11-26
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Expires: 2010-07-27
Abstract
Abstract The invention discloses a magnetic bearing device having a rotary main shaft, an armature disk mounted on the rotary main shaft, and a pair of bearing elements disposed on opposite sides in axial direction of the armature disk of bearing elements includes a permanent magnet provided with a pair of pole pieces, the top ends of each of the pole pieces being disposed near to the armature disk, and a control coil being disposed between said pole pieces at a position nearer to front end side than the control coil.
Inventors
- 👤 Akira Yamamura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 11:50
CPC Classifications
F; F16; F16C; F16C33/00; F16C33/02; F16C33/04; F16C32/00; F16C32/04; F16C32/0406; F16C32/044; F16C32/0459; F16C32/0461; F16C32/0465; F04; F04D; F04D19/00; F04D19/02; F04D19/04; F04D19/048; F04D29/00; F04D29/05; F04D29/051; F16C32/0444; F16C32/0446; F16C32/0448; F16C32/0474; F16C32/0476; F16C32/0478
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
94 words
A magnetic bearing device comprising: a rotary main shaft; an armature disk mounted on said rotary main shaft; and a pair of bearing elements disposed on opposite sides of an axial direction of said armature disk, each of said bearing elements including a permanent magnet provided with a pair of pole pieces, a top end of each of the pole pieces being disposed near said armature disk, and a control coil being disposed between the pole pieces at a position nearer to a front end side of said bearing elements than the permanent magnet.
Claim 2
Dependent Claim
94 words
A magnetic bearing device comprising: a rotary main shaft; an armature disk mounted on said rotary main shaft; and a pair of bearing elements disposed on opposite sides of an axial direction of said armature disk, each of said bearing elements including a permanent magnet provided with a pair of pole pieces, a top end of each of the pole pieces being disposed near said armature disk, and a control coil being disposed between the pole pieces at a position nearer to a front end side of said bearing elements than the permanent magnet.
References Cited (Backward Citations)
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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) | 1994-11-25 | 1995-05-27 | 1995-11-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-11-25 | 1999-05-27 | 1999-11-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-11-25 | 2003-05-27 | 2003-11-26 | $7700.00 | Window Closed / Lapsed |