Patent US3671787A successfully refreshed from Google Patents.
US3671787A
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Laminated dynamoelectric machine having nonmagnetic lamina for structural support
Assignee: International Business Machines Corp
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Filing: 1971-08-16
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Granted: 1972-06-20
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Expires: 1991-08-16
Abstract
Abstract A permanent magnet dynamoelectric machine whose housing is formed by a plurality of continuous nonmagnetic lamina which support a plurality of discontinuous magnetic lamina in cooperative relation to permanent magnets. The nonmagnetic lamina structurally defines the machine housing and includes lamina cavities to hold the magnets. The nonmagnetic lamina includes other lamina portions which mount the discontinuous magnetic lamina in cooperative relation to the magnets to define the magnetic flux path and the working air gap.
Inventors
- 👤 Christopher C Herron
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 08:10
CPC Classifications
H; H02; H02K; H02K23/00; H02K23/02; H02K23/04; H02K1/00; H02K1/06; H02K1/12; H02K1/17
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
148 words
In a permanent magnet dynamoelectric machine having an armature which moves relative to an axis, and having means establishing at least one magnetic couple relative to said axis, the improvement comprising: at least two axially extending permanent magnets, at least two groups of individual focusing magnetic laminas, one group being associated with each of said permanent magnets to focus the magnetic flux therefrom to a working air gap for the armature, at least one group of individual flux-interconnecting magnetic laminas associated with said permanent magnets to complete a low reluctance magnetic flux path between said magnets, and a plurality of individual nonmagnetic laminas positioned to extend between at least certain planar coextensive laminas of said focusing magnetic laminas and said flux-interconnecting magnetic laminas, and means including said nonmagnetic laminas defining at least two cavities to receive and hold said permanent magnets in operative relation to said magnetic laminas.
Claim 2
Dependent Claim
148 words
In a permanent magnet dynamoelectric machine having an armature which moves relative to an axis, and having means establishing at least one magnetic couple relative to said axis, the improvement comprising: at least two axially extending permanent magnets, at least two groups of individual focusing magnetic laminas, one group being associated with each of said permanent magnets to focus the magnetic flux therefrom to a working air gap for the armature, at least one group of individual flux-interconnecting magnetic laminas associated with said permanent magnets to complete a low reluctance magnetic flux path between said magnets, and a plurality of individual nonmagnetic laminas positioned to extend between at least certain planar coextensive laminas of said focusing magnetic laminas and said flux-interconnecting magnetic laminas, and means including said nonmagnetic laminas defining at least two cavities to receive and hold said permanent magnets in operative relation to said magnetic laminas.
Claim 3
Dependent Claim
29 words
A permanent magnet machine as defined in claim 1 wherein said nonmagnetic laminas extend beyond the boundary of at least said flux-interconnecting magnetic laminas to form air cooling fins.
Claim 4
Dependent Claim
27 words
A rotary permanent magnet machine as defined in claim 1 wherein said magnets are positioned in said cavities to produce series-aiding magnetic flux at said air gap.
Claim 5
Dependent Claim
32 words
A permanent magnet machine as defined in claim 1 wherein each of said focusing magnetic laminas and said flux-interconnecting magnetic laminas are separated from the adjacent magnetic Lamina by a nonmagnetic lamina.
Claim 6
Dependent Claim
31 words
A permanent magnet machine as defined in claim 4 wherein said magnetic lamina and said nonmagnetic lamina are formed in alternating layers of discontinuous magnetic-metal stampings and continuous nonmagnetic-metal stampings, respectively.
Claim 7
Dependent Claim
24 words
A permanent magnet machine as defined in claim 5 wherein adjacent layers of said stampings are secured one to the other by an adhesive.
Claim 8
Dependent Claim
67 words
A round permanent magnet machine as defined in claim 1 wherein an even number of permanent magnets are circumferentially spaced about a centrally disposed tubular-shaped magnetic flux return path member, the annular space between said focusing magnetic laminas and said flux return path member defining said working air gap, and wherein said flux-interconnecting magnetic laminas take the form of a plurality of ring lamina encircling said magnets.
Claim 9
Dependent Claim
23 words
A rotary permanent magnet machine as defined in claim 7 wherein said permanent magnets circumferentially alternate in magnetic polarity about said air gap.
Claim 10
Dependent Claim
84 words
A round permanent magnet machine as defined in claim 7 wherein each coplanar layer of said magnetic lamina is formed of discontinuous magnetic-metal stampings, said flux-interconnecting laminas taking the form of rings, and said focusing magnetic lamina taking the form of individual stampings for each of said magnets; and wherein each coplanar layer of said nonmagnetic lamina is formed of a continuous nonmagnetic metal stamping having a plurality of individual cavities to receive said magnets and having portions generally coextensive with said magnetic lamina.
Claim 11
Dependent Claim
56 words
A round permanent magnet machine as defined in claim 9 having alternating coplanar layers of magnetic and nonmagnetic lamina to thus form a motor housing, and wherein said nonmagnetic lamina is additionally formed to provide an axially extending internal void between circumferentially adjacent magnets, said voids facilitating the flow of a cooling medium through the machine.
Claim 12
Dependent Claim
29 words
A round permanent magnet machine as defined in claim 10 wherein at least certain of said nonmagnetic laminas radially extend beyond said ring-shaped flux-interconnecting laminas to form cooling fins.
Claim 13
Dependent Claim
122 words
A flat permanent magnet machine as defined in claim 1 wherein an even number of permanent magnets are positioned in general alignment on opposite sides of said axis; wherein each of said magnets is associated with focusing magnetic laminas shaped to focus the magnetic flux therefrom to a centrally disposed tubular-shaped magnetic flux return path member, the resulting annular space between said focusing magnetic laminas and said flux return path member defining said air gap; and wherein said flux-interconnecting magnetic laminas take the form of at least two groups of laminas, one of which is associated with the magnets on one side of said axis and the other of which is associated with the magnets on the other side of said axis.
Claim 14
Dependent Claim
82 words
A flat permanent magnet machine as defined in claim 12 wherein each coplanar layer of said magnetic lamina is formed of discontinuous magnetic-metal stampings, and wherein each coplanar layer of said nonmagnetic lamina is formed of a continuous nonmagnetic-metal stamping having individual cavities to receive said magnets and having portions which are generally coextensive with said magnetic lamina, said nonmagnetic laminas extend between said magnetic laminas to structurally support said magnetic laminas in cooperative relation to said magnets and said air gap.
Claim 15
Dependent Claim
25 words
A flat permanent magnet machine as defined in claim 13 wherein said machine is formed of alternate coplanar layers of magnetic lamina and nonmagnetic lamina.
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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) | 1975-06-20 | 1975-12-20 | 1976-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-20 | 1979-12-20 | 1980-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-20 | 1983-12-20 | 1984-06-20 | $7700.00 | Window Closed / Lapsed |