US3590293A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dynamoelectric machine having a stationary assembly of the permanent magnet type
Assignee: General Electric Co
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Filing: 1969-09-29
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Granted: 1971-06-29
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Expires: 1989-09-29
Abstract
Abstract A dynamoelectric machine incorporating permanent magnet stationary structure capable of use requiring fast electrical response and acceleration rates, such as peripheral computer and machine tool applications. The magnetic poles of the stationary structure include at least two permanent magnets in series circuit relation of different magnetic characteristics and size having a flux shunt therebetween to develop high flux densities in the airgap, to permit good dissipation of heat from the poles, and to attain generally balanced high energy operation. The stationary structure also includes a single short-circuited winding adjacent the bore tending to linearize acceleration of the machine.
Inventors
- 👤 Robert A Susdorf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 12:30
CPC Classifications
H; H02; H02K; H02K23/00; H02K23/02; H02K23/04; H02K23/22
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
114 words
A dynamoelectric machine comprising a rotatable assembly; and a stationary assembly having a bore for receiving the rotatable assembly to form an airgap therebetween, and a magnetic circuit including a magnetic yoke for forming a flux path spaced radially outward from the bore, and a number of flux generating magnetic poles disposed between the bore and the yoke; the magnetic poles including at least first and second permanent magnets radially aligned in series magnetic circuit with their respective poles oriented generally in the same direction, with the second permanent magnet when compared to the first permanent magnet, being positioned radially nearer the bore, having a high flux density, and being smaller in cross section.
Claim 2
Dependent Claim
114 words
A dynamoelectric machine comprising a rotatable assembly; and a stationary assembly having a bore for receiving the rotatable assembly to form an airgap therebetween, and a magnetic circuit including a magnetic yoke for forming a flux path spaced radially outward from the bore, and a number of flux generating magnetic poles disposed between the bore and the yoke; the magnetic poles including at least first and second permanent magnets radially aligned in series magnetic circuit with their respective poles oriented generally in the same direction, with the second permanent magnet when compared to the first permanent magnet, being positioned radially nearer the bore, having a high flux density, and being smaller in cross section.
Claim 3
Dependent Claim
31 words
The dynamoelectric machine of claim 1 in which a flux shunt formed of magnetic material is mounted between said first and second permanent magnets to form a radial flux path therebetween.
Claim 4
Dependent Claim
40 words
The dynamoelectric machine of claim 1 in which a short-circuited winding is carried adjacent the bore for inducing currents opposing field changes resulting from changes in current of the rotatable assembly tending to aid in linearizing acceleration of the machine.
Claim 5
Dependent Claim
46 words
The dynamoelectric machine of claim 1 in which the ratio of flux densities for the first and second permanent magnets is approximately the inverse of the ratio of the areas for the same permanent magnets to provide a generally balanced high energy operation for the machine.
Claim 6
Dependent Claim
127 words
A dynamoelectric machine comprising an armature assembly; and a stationary assembly having a bore for receiving the armature assembly to form an airgap therewith and a magnetic circuit including a number of flux generating magnetic poles disposed around the bore, said poles including at least first and second permanent magnets in series magnetic circuit relation, said second permanent magnet being positioned radially inward of said first permanent magnet, and having a higher flux density than said first permanent magnet; said magnetic poles including flux shunts disposed next to the bore, each carrying a number of electrically conductive elements, said elements being electrically joined together adjacent the respective axial ends of the magnetic poles to form a single short-circuited winding for reducing the inductance of the armature assembly.
Claim 7
Dependent Claim
127 words
A dynamoelectric machine comprising an armature assembly; and a stationary assembly having a bore for receiving the armature assembly to form an airgap therewith and a magnetic circuit including a number of flux generating magnetic poles disposed around the bore, said poles including at least first and second permanent magnets in series magnetic circuit relation, said second permanent magnet being positioned radially inward of said first permanent magnet, and having a higher flux density than said first permanent magnet; said magnetic poles including flux shunts disposed next to the bore, each carrying a number of electrically conductive elements, said elements being electrically joined together adjacent the respective axial ends of the magnetic poles to form a single short-circuited winding for reducing the inductance of the armature assembly.
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 |