Patent US4893040A successfully refreshed from Google Patents.
US4893040A
Expired / Lapsed
US
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Dynamo-electric machines
Assignee: Aisin Corp
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Filing: 1988-05-05
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Granted: 1990-01-09
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Expires: 2008-05-05
Abstract
Abstract A rotating part for a high speed synchronous generator comprises a core of magnetic material, side walls of nonmagnetic material, and an outer circumferential portion. The outer circumferential portion is provided on its outside with an inner layer, an inner retaining ring, an outer layer and an outer retaining ring. The inner and outer layers are made up of magnetic and nonmagnetic portions. The retaining rings are of magnetic material. The greater strength and lighten weight of the nonmagnetic portions reduces the centrifugal forces on the magnetic portions. In an alternative embodiment, the outer circumferential portion comprises a number of layers comprising alternate portions of magnetic and nonmagnetic material, retained by rings of magnetic material. The nonmagnetic portions support the magnetic material, and prevent it from damage through centrifugal force. Another alternative embodiment includes recesses in the outer retaining ring and a nommagnetic material disposed in said recesses for securing the retaining ring. Another alternative embodiment comprises a magnetic core, a nomagnetic side wall of high strength, a magnetic portion, and a retaining ring divided into magnetic parts and nonmagnetic parts.
Inventors
- 👤 Alan B. Turner
- 👤 Toshiyuki Kondo
- 👤 Katsuhiro Mori
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:46
CPC Classifications
H; H02; H02K; H02K1/00; H02K1/06; H02K1/22; H02K1/27; H02K1/2706; H02K1/272; H02K1/274; H02K1/2753; H02K1/276
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
66 words
A rotating part for a dynamo-electric machine, comprising: a core portion of magnetic material; an annular permanent magnet surrounding said core portion, said annular permanent magnet includes a plurality of annular permanent magnet rings separated axially by nonmagnetic rings; an annular retaining ring of magnetic material for securing the annular permanent magnet; and a side wall made of a nonmagnetic material adjacent said annular permanent magnet.
Claim 2
Dependent Claim
66 words
A rotating part for a dynamo-electric machine, comprising: a core portion of magnetic material; an annular permanent magnet surrounding said core portion, said annular permanent magnet includes a plurality of annular permanent magnet rings separated axially by nonmagnetic rings; an annular retaining ring of magnetic material for securing the annular permanent magnet; and a side wall made of a nonmagnetic material adjacent said annular permanent magnet.
Claim 3
Dependent Claim
17 words
The rotating part according to claim 1, further comprising a plurality of layers of permanent magnet rings.
Claim 4
Dependent Claim
19 words
The rotating part according to claim 2, further comprising a retaining ring of magnetic material for each such layer.
Claim 5
Dependent Claim
21 words
The rotating part according to claim 2, wherein the nonmagnetic rings are equidistantly spaced along the axis of the rotating part.
Claim 6
Dependent Claim
19 words
The rotating part according to claim 1, wherein the retaining ring is made from a high strength magnetic alloy.
Claim 7
Dependent Claim
49 words
A rotating part for a dynamo-electric machine, comprising: an annular permanent magnet; an annular retaining ring of magnetic material for securing the annular permanent magnet, the retaining ring having an outer circumferential recess therein; and a nonmagnetic material disposed in the recess for securing the ring against centrifugal forces.
Claim 8
Dependent Claim
49 words
A rotating part for a dynamo-electric machine, comprising: an annular permanent magnet; an annular retaining ring of magnetic material for securing the annular permanent magnet, the retaining ring having an outer circumferential recess therein; and a nonmagnetic material disposed in the recess for securing the ring against centrifugal forces.
Claim 9
Dependent Claim
35 words
The rotating part according to claim 6, further comprising: a core portion made of magnetic material inside the annular permanent magnet; and side wall portions made of a nonmagnetic material adjacent said annular permanent magnet.
Claim 10
Dependent Claim
24 words
The rotating part according to claim 6, wherein the annular permanent magnet includes a plurality of permanent magnet rings separated axially by nonmagnetic rings.
Claim 11
Dependent Claim
17 words
The rotating part according to claim 8, further comprising a plurality of layers of permanent magnet rings.
Claim 12
Dependent Claim
19 words
The rotating part according to claim 9, further comprising a retaining ring of magnetic material for each such layer.
Claim 13
Dependent Claim
21 words
The rotating part according to claim 9, wherein the nonmagnetic rings are equidistantly spaced along the axis of the rotating part.
Claim 14
Dependent Claim
19 words
The rotating part according to claim 6, wherein the retaining ring is made from a high strength magnetic alloy.
Claim 15
Dependent Claim
70 words
A rotating part for a dynamo-electric machine, comprising: a core portion of magnetic material; a first annular permanent magnet having a plurality of outer circumferential recesses therein, said first annular permanent magnet surrounding said core portion; a nonmagnetic material disposed in each of the recesses for securing the first annular permanent magnet against centrifugal forces; and side wall portions made of a nonmagnetic material adjacent said first annular permanent magnet.
Claim 16
Dependent Claim
70 words
A rotating part for a dynamo-electric machine, comprising: a core portion of magnetic material; a first annular permanent magnet having a plurality of outer circumferential recesses therein, said first annular permanent magnet surrounding said core portion; a nonmagnetic material disposed in each of the recesses for securing the first annular permanent magnet against centrifugal forces; and side wall portions made of a nonmagnetic material adjacent said first annular permanent magnet.
Claim 17
Dependent Claim
22 words
The rotating part according to claim 13, further comprising a second annular permanent magnet concentrically disposed about said first annular permanent magnet.
Claim 18
Dependent Claim
33 words
The rotating part according to claim 14, wherein said second annular permanent magnet includes an outer circumferential recess therein and a nonmagnetic material disposed in the recess of said second annular permanent magnet.
Claim 19
Dependent Claim
61 words
A rotating part for a dynamo-electric machine, comprising: an annular magnetic portion comprising a plurality of permanent magnet sections, the polarity of each of said permanent magnet sections being aligned in substantially the same direction; and an annular retaining ring disposed about said annular magnetic portion, said retaining ring including two diametrically opposed magnetic portions and two diametrically opposed nonmagnetic portions.
Claim 20
Dependent Claim
61 words
A rotating part for a dynamo-electric machine, comprising: an annular magnetic portion comprising a plurality of permanent magnet sections, the polarity of each of said permanent magnet sections being aligned in substantially the same direction; and an annular retaining ring disposed about said annular magnetic portion, said retaining ring including two diametrically opposed magnetic portions and two diametrically opposed nonmagnetic portions.
Claim 21
Dependent Claim
41 words
The rotating part according to claim 16, wherein the outer periphery of a first half of the annular magnetic portion has a first polarity and the outer periphery of a second half of the annular magnetic portion has a second polarity.
Claim 22
Dependent Claim
31 words
The rotating part according to claim 17, wherein said nonmagnetic portions of the retaining ring are arranged at the junctions of the first and second halves of the annular magnetic portion.
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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) | 1993-01-08 | 1993-07-10 | 1994-01-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-01-08 | 1997-07-10 | 1998-01-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-01-08 | 2001-07-10 | 2002-01-09 | $7700.00 | Window Closed / Lapsed |