Patent US3699372A successfully refreshed from Google Patents.
US3699372A
Expired / Lapsed
US
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Rotor for dynamo-electric machine of the axial airgap type
Assignee: Tokai Cold Forming Co Ltd
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Filing: 1971-06-17
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Granted: 1972-10-17
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Expires: 1991-06-17
Abstract
Abstract A dynamo-electric machine of the axial airgap type has a rotor comprising a plurality of wedge-shaped grain oriented core segments arranged in a circular array, each core segment having a crystallographic orientation such that the directivity of magnetic orientation thereof, in directions parallel to the rotor axis, is high at and around the inner portion of the lamination, proximate to the rotor periphery, and is low at and around the inner portion of the lamination, proximate to the rotor shaft. Preferably, the core segments are made of iron having a degree of purity of at least 99.6 percent.
Inventors
- 👤 Michio Abe
- 👤 Naoyuki Maeda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 22:02
CPC Classifications
B; B22; B22D; B22D19/00; B22D19/0054; H; H02; H02K; H02K15/00; H02K15/02; H02K15/021; H02K15/023; H02K17/00; H02K17/02; H02K17/16
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
154 words
In a dynamo-electric machinE of the axial airgap type, comprising rotor means including a rotor shaft, a plurality of wedge-shaped core segments arranged in a circular array about the rotor shaft, the core segments having wider ends adjacent the outer periphery of said circular array and narrower ends adjacent the axial center of the array, and supporting means for the array of core segments including a secondary conductor forming radially extending supporting members between the wedge-shaped core segments and a rim surrounding the core segments adjacent the outer periphery of said array, the improvement of each of said core segments having a crystallographic orientation such that the directivity of magnetic orientation thereof, in directions parallel to the rotor axis, is high at and around the outer portion of the core segment, proximate to the rotor periphery, and is low at and around the inner portion of the core segment, proximate to the rotor shaft.
Claim 2
Dependent Claim
154 words
In a dynamo-electric machinE of the axial airgap type, comprising rotor means including a rotor shaft, a plurality of wedge-shaped core segments arranged in a circular array about the rotor shaft, the core segments having wider ends adjacent the outer periphery of said circular array and narrower ends adjacent the axial center of the array, and supporting means for the array of core segments including a secondary conductor forming radially extending supporting members between the wedge-shaped core segments and a rim surrounding the core segments adjacent the outer periphery of said array, the improvement of each of said core segments having a crystallographic orientation such that the directivity of magnetic orientation thereof, in directions parallel to the rotor axis, is high at and around the outer portion of the core segment, proximate to the rotor periphery, and is low at and around the inner portion of the core segment, proximate to the rotor shaft.
Claim 3
Dependent Claim
27 words
In the dynamo-electric machine of claim 1, each of the core segments being of electromagnetic pure iron having a degree of purity of at least 99.6 percent.
Claim 4
Dependent Claim
34 words
In the dynamo-electric machine of claim 1, the secondary conductor being a die-cast metal disc member fixing and bonding the core segments and the rotor shaft together to form an integral disc type rotor.
Claim 5
Dependent Claim
26 words
In the dynamo-electric machine of claim 3, each of the core segments having flange portions extending in planes parallel to the faces of the disc member.
Claim 6
Dependent Claim
46 words
In the dynamo-electric machine of claim 1, the secondary conductor being a conductive metal disc member having a plurality of core segment receiving windows arranged circularly about a central bore receiving the rotor shaft, and the core segments having flange portions riveted to the disc windows.
Claim 7
Dependent Claim
41 words
In the dynamo-electric machine of claim 1, the secondary conductor comprising an inner circular disc portion, the rim being fitted around the periphery of the disc portion, and the disc portion having radially extending teeth wherebetween the core segments are received.
References Cited (Backward Citations)
US3296475A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-10-17 | 1976-04-17 | 1976-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-17 | 1980-04-17 | 1980-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-17 | 1984-04-17 | 1984-10-17 | $7700.00 | Window Closed / Lapsed |