Patent US4797592A successfully refreshed from Google Patents.
US4797592A
Expired / Lapsed
US
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Dynamo electric machine with upwardly shifted ripple frequency
Assignee: Kollmorgen Technologies Corp
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Filing: 1982-06-17
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Granted: 1989-01-10
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Expires: 2002-06-17
Abstract
Abstract A rotary electric dynamo machine in which the ripple component in the output occurs at a higher frequency. One half of the pole faces have a nonuniform airgap while the other half have a uniform air gap and cover a noninteger slot distance. The armature has an odd number of slots. Instead of the usual ripple component at the slot frequency, a dynamo constructed as described above, surprisingly, has a predominant ripple component at twice the slot frequency.
Inventors
- 👤 Thomas R. England
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 08:04
CPC Classifications
G; G01; G01P; G01P3/00; G01P3/42; G01P3/44; G01P3/46; G01P3/465; H; H02; H02K; H02K23/00; H02K23/02; H02K23/40
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
118 words
In a rotary dynamo electric machine the combination of a rotor including winding slots, armature windings located in said slots, and commutating means connected to said windings; a stator including at least one permanent magnet providing a pole face with a nonuniform airgap relative to said rotor, at least one pole face provided by a consequent pole, said pole face of said consequent pole spanning a distance on the surface off said rotor different from the integer slot distance, and means including said permanent magnet for generating magnetic flux at said pole faces; and wherein said permanent magnet is in a block form providing a flat pole face surface to provide said nonuniform airgap relative to said rotor.
Claim 2
Dependent Claim
118 words
In a rotary dynamo electric machine the combination of a rotor including winding slots, armature windings located in said slots, and commutating means connected to said windings; a stator including at least one permanent magnet providing a pole face with a nonuniform airgap relative to said rotor, at least one pole face provided by a consequent pole, said pole face of said consequent pole spanning a distance on the surface off said rotor different from the integer slot distance, and means including said permanent magnet for generating magnetic flux at said pole faces; and wherein said permanent magnet is in a block form providing a flat pole face surface to provide said nonuniform airgap relative to said rotor.
Claim 3
Dependent Claim
124 words
In a rotary dynamo electric machine the combination of a rotor including winding slots, armature windings located in said slots, and commutating means connected to said windings; a stator including at least one permanent magnet providing a pole face with a nonuniform airgap relative to said rotor, at least one pole face provided by a consequent pole, said pole face of said consequent pole spanning a distance on the surface off said rotor different from the integer slot distance, and means including said permanent magnet for generating magnetic flux at said pole faces; and wherein said pole face with a substantially uniform airgap is a consequent pole and wherein said consequent pole face spans an integer slot distance plus one half a slot distance.
Claim 4
Dependent Claim
124 words
In a rotary dynamo electric machine the combination of a rotor including winding slots, armature windings located in said slots, and commutating means connected to said windings; a stator including at least one permanent magnet providing a pole face with a nonuniform airgap relative to said rotor, at least one pole face provided by a consequent pole, said pole face of said consequent pole spanning a distance on the surface off said rotor different from the integer slot distance, and means including said permanent magnet for generating magnetic flux at said pole faces; and wherein said pole face with a substantially uniform airgap is a consequent pole and wherein said consequent pole face spans an integer slot distance plus one half a slot distance.
Claim 5
Dependent Claim
72 words
In a rotary dynamo electric machine, the combination of a rotor including an odd number of winding slots, armature windings located in said slots, and commutating means connected to said windings; and a stator including at least one pole face with a nonuniform airgap relative to said rotor, at least one pole face with a substantially uniform airgap relative to said rotor, and means for generating magnetic flux at said pole faces.
Claim 6
Dependent Claim
72 words
In a rotary dynamo electric machine, the combination of a rotor including an odd number of winding slots, armature windings located in said slots, and commutating means connected to said windings; and a stator including at least one pole face with a nonuniform airgap relative to said rotor, at least one pole face with a substantially uniform airgap relative to said rotor, and means for generating magnetic flux at said pole faces.
Claim 7
Dependent Claim
18 words
A dynamo electric machine in accordance with claim 3 wherein said means includes at least one permanent magnet.
Claim 8
Dependent Claim
33 words
A dynamo electric machine in accordance with claim 4 wherein said permanent magnet is in a block form providing a flat pole face surface to provide said nonuniform airgap relative to said rotor.
Claim 9
Dependent Claim
25 words
A dynamo electric machine in accordance with claim 4 wherein said pole face with a substantially uniform air gap is provided by a consequent pole.
Claim 10
Dependent Claim
122 words
In a dyamo electric machine the combination of a rotor including winding slots, armature windings located in said slots, and commutating means connected to said windings; a stator including at least one permanent magnet providing a pole face with a nonuniform airgap relative to said rotor, at least one pole face provided by a consequent pole, said pole face of said consequent pole spanning a distance on the surface off said rotor different from the integer slot distance, and means including said permanent magnet for generating magnetic flux at said pole faces; and wherein said pole face of said consequent pole has a substantially unform airgap relative to said rotor and spans an integer slot pitch plus one half a slot pitch.
Claim 11
Dependent Claim
122 words
In a dyamo electric machine the combination of a rotor including winding slots, armature windings located in said slots, and commutating means connected to said windings; a stator including at least one permanent magnet providing a pole face with a nonuniform airgap relative to said rotor, at least one pole face provided by a consequent pole, said pole face of said consequent pole spanning a distance on the surface off said rotor different from the integer slot distance, and means including said permanent magnet for generating magnetic flux at said pole faces; and wherein said pole face of said consequent pole has a substantially unform airgap relative to said rotor and spans an integer slot pitch plus one half a slot pitch.
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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) | 1992-01-10 | 1992-07-11 | 1993-01-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-01-10 | 1996-07-11 | 1997-01-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-01-10 | 2000-07-11 | 2001-01-10 | $7700.00 | Window Closed / Lapsed |