Patent US4695754A successfully refreshed from Google Patents.
US4695754A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Permanent magnet rotor for an electrical machine
Assignee: DSO ELPROM , A CORP OF BULGARIA
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Filing: 1985-05-28
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Granted: 1987-09-22
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Expires: 2005-05-28
Abstract
Abstract A rotor of an electrical machine comprising pole pieces representing laminated packs of flux-conducting lamellae, and permanent magnets directly contacting the pole terminals, gaps being provided between the flux-conducting lamellae. The gaps are provided by projections on the lamellae themselves. The magnetic flux created by the permanent magnets is conducted through the pole pieces which are usually magnetically unsaturated. Since the latter consists of flux-conducting lamellae between which gaps are provided, the weight and inertia moment of the rotor are reduced without reducing the magnitude of the magnetic flux in the machine.
Inventors
- 👤 Entcho N. Popov
- 👤 Krestyo A. Stanilov
- 👤 Rumen K. Apostolov
- 👤 Pantcho G. Dundarov
- 👤 Peyu V. Radkov
- 👤 Pentcho K. Aderski
- 👤 Georgi A. Georgiev
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 18:46
CPC Classifications
H; H02; H02K; H02K1/00; H02K1/06; H02K1/22; H02K1/27; H02K1/2706; H02K1/272; H02K1/274; H02K1/2753; H02K1/276; H02K1/2766; H02K1/2773
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
78 words
An inductor of a rotary electrical machine comprising a plurality of pole pieces, each pole piece representing a laminated pack of flux-conducting lamellae, and a plurality of permanent magnets, each magnet directly contacting a pole piece, gaps being provided between each of the flux-conducting lamellae: the pole pieces and the permanent magnets being covered by non-magnetic discs arranged parallel to said lamellae and clamped in a pack by studs, said non-magnetic disks being statically fixed to a shaft.
Claim 2
Dependent Claim
78 words
An inductor of a rotary electrical machine comprising a plurality of pole pieces, each pole piece representing a laminated pack of flux-conducting lamellae, and a plurality of permanent magnets, each magnet directly contacting a pole piece, gaps being provided between each of the flux-conducting lamellae: the pole pieces and the permanent magnets being covered by non-magnetic discs arranged parallel to said lamellae and clamped in a pack by studs, said non-magnetic disks being statically fixed to a shaft.
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) | 1990-09-21 | 1991-03-23 | 1991-09-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-09-21 | 1995-03-23 | 1995-09-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-09-21 | 1999-03-23 | 1999-09-22 | $7700.00 | Window Closed / Lapsed |