US4227105A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Annular magnet assembly
Assignee: Individual
•
Filing: 1979-06-04
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Granted: 1980-10-07
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Expires: 1999-06-04
Abstract
Abstract An annular magnet assembly for a dynamoelectric machine includes a plurality of arcuate permanent magnets disposed in an annular array and a frame member of a non-magnetic material for rigidly connecting the magnets together. The magnets are disposed in end-to-end abutment to form the annular array, both ends of each magnet being cut to form a recess in the inner or outer peripheral surface of the annular array at the respective abutments of the magnets. The frame member comprises a pair of annular portions which tightly engage the opposite sides of the annular array and ledge portions extending through the recesses to connect the pair of annular portions together.
Inventors
- 👤 Shokichi Kumakura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 08:43
CPC Classifications
H; H02; H02K; H02K1/00; H02K1/06; H02K1/22; H02K1/27; H02K1/2706; H02K1/272; H02K1/274; H02K1/2753; H02K1/278; H02K1/12; H02K1/17; H02K1/18; H02K1/2786; H02K1/2787; H02K1/2789; H02K1/2791; H02K21/00; H02K21/12; H02K21/14; H02K21/145; H02K21/22; H02K21/227; H02K21/26; H02K2201/00; H02K2201/12
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
183 words
An annular magnet assembly adapted to be mounted on an annular or cylindrical surface of a dynamoelectric machine for producing a magnetic field therein, comprising a plurality of arcuate permanent magnets disposed in an end-to-end abutment to form an annular array, each of the permanent magnets having a first and a second major surface, the first surface being in engagement with the annular or cylindrical surface of the machine, both ends of each permanent magnet being cut to form a recess in the second major surface at the respective abutment of the magnets, said recess being disposed on opposite sides of the respective abutment of the magnets and extending axially across the axial width of said magnets, and a frame member of a non-magnetic material for rigidly connecting the magnets together, the frame member including a pair of annular portions which tightly engage the opposite sides of the annular array and ledge portions disposed in said recesses and extending axially across the width of said magnets to connect the pair of annular portions together and radially retain said magnets in said frame member.
Claim 2
Dependent Claim
183 words
An annular magnet assembly adapted to be mounted on an annular or cylindrical surface of a dynamoelectric machine for producing a magnetic field therein, comprising a plurality of arcuate permanent magnets disposed in an end-to-end abutment to form an annular array, each of the permanent magnets having a first and a second major surface, the first surface being in engagement with the annular or cylindrical surface of the machine, both ends of each permanent magnet being cut to form a recess in the second major surface at the respective abutment of the magnets, said recess being disposed on opposite sides of the respective abutment of the magnets and extending axially across the axial width of said magnets, and a frame member of a non-magnetic material for rigidly connecting the magnets together, the frame member including a pair of annular portions which tightly engage the opposite sides of the annular array and ledge portions disposed in said recesses and extending axially across the width of said magnets to connect the pair of annular portions together and radially retain said magnets in said frame member.
Claim 3
Dependent Claim
43 words
An annular magnet assembly according to claim 1, further comprising additional recesses formed in the first surface between the adjacent magnets, and the frame member includes additional ledge portions which extend through the additional recesses to connect the pair of annular portions together.
Claim 4
Dependent Claim
18 words
An annular magnet assembly according to claim 1, further comprising an annular band which covers the first surface.
Claim 5
Dependent Claim
17 words
An annular magnet assembly according to claim 3 in which the band is of a magnetizable material.
Claim 6
Dependent Claim
27 words
An annular magnet assembly according to claim 1 in which the first and the second surface respectively to the outer and the inner surface of the assembly.
Claim 7
Dependent Claim
27 words
An annular magnet assembly according to claim 1 in which the first and the second surface respectively to the inner and the outer surface of the assembly.
Claim 8
Dependent Claim
29 words
An annular magnet assembly according to claim 2 in which the surface of the magnets which defines the first surface is covered with a plate of a magnetizable material.
References Cited (Backward Citations)
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US2756356A
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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) | 1983-10-07 | 1984-04-07 | 1984-10-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-10-07 | 1988-04-07 | 1988-10-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-10-07 | 1992-04-07 | 1992-10-07 | $7700.00 | Window Closed / Lapsed |