US3590294A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Synchronous machine provided with comb-shaped magnetic poles
Assignee: Toshiba Corp
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Filing: 1969-09-02
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Granted: 1971-06-29
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Expires: 1989-09-02
Abstract
Abstract Disclosed herein is a synchronous machine having a pair of opposite magnetic rotor members with interleaved poles of opposite polarities, wherein portions of the rotor members between adjacent poles are cut away, and the inner corners of each pole are also cut away to decrease leakage flux; and the diameter of portions of the poles outside the armature core are reduced to decrease armature leakage reactance.
Inventors
- 👤 Junpei Inagaki
- 👤 Hiroyuki Kitamura
- 👤 Hideo Sumitani
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 14:13
CPC Classifications
H; H02; H02K; H02K1/00; H02K1/06; H02K1/22; H02K1/24; H02K1/243; H02K19/00; H02K19/16; H02K19/22; H02K19/24; H02K1/32; H02K1/325; H02K9/00; H02K9/19; H02K9/197
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
132 words
In an improved synchronous machine including a stationary armature and a rotor having a shaft fixed thereto; two opposite magnetic members, each said magnetic member including a magnetic cylinder mounted on the rotor shaft, a plurality of axially projecting poles, a magnetic yoke interconnecting said cylinder and said poles; said poles of said two magnetic members being alternately interleaved to form magnetic poles of alternate polarity; wherein the improvement comprises: first tapered cutout portions on said yokes, said first tapered cutout portions on each said yoke being disposed between its poles and inclined outwardly in the direction opposite the projecting direction of its poles; and, second tapered cutout portions on each said pole, said second tapered cutout portions being disposed along the axial and circumferential inner edges of each said projecting pole.
Claim 2
Dependent Claim
132 words
In an improved synchronous machine including a stationary armature and a rotor having a shaft fixed thereto; two opposite magnetic members, each said magnetic member including a magnetic cylinder mounted on the rotor shaft, a plurality of axially projecting poles, a magnetic yoke interconnecting said cylinder and said poles; said poles of said two magnetic members being alternately interleaved to form magnetic poles of alternate polarity; wherein the improvement comprises: first tapered cutout portions on said yokes, said first tapered cutout portions on each said yoke being disposed between its poles and inclined outwardly in the direction opposite the projecting direction of its poles; and, second tapered cutout portions on each said pole, said second tapered cutout portions being disposed along the axial and circumferential inner edges of each said projecting pole.
Claim 3
Dependent Claim
39 words
An improved synchronous machine as set forth in claim 1, in which a portion of the outer surface of each said pole extends axially outside of said armature, said extending portion of each said pole having a reduced diameter.
Claim 4
Dependent Claim
29 words
An improved synchronous machine as set forth in claim 1, in which a nonmagnetic wedge is welded between a pair of adjacent poles, thereby joining together opposite magnetic members.
Claim 5
Dependent Claim
21 words
An improved synchronous machine as set forth in claim 1, in which said two yokes have aluminum die cast material therebetween.
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) | 1974-06-28 | 1974-12-28 | 1975-06-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-28 | 1978-12-28 | 1979-06-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-28 | 1982-12-28 | 1983-06-29 | $7700.00 | Window Closed / Lapsed |