Patent US2308541A successfully refreshed from Google Patents.
US3676764A
Expired / Lapsed
US
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Brushless alternating current generator
Assignee: Kohler Co
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Filing: 1971-01-29
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Granted: 1972-07-11
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Expires: 1991-01-29
Abstract
Abstract A self-excited brushless alternating current generator utilizes a four-pole direct current excitation winding wound on a stator and operable to generate an exciter flux which induces an alternating current in a field excitation winding wound on a rotor. The field excitation winding connects through rectifiers to a d-c main field winding also wound on the rotor. The main field winding generates a main field flux which induces an alternating current in a two-pole a-c output winding wound on the stator. No brushes are required and the excitor windings are wound on the same magnetic core with the generator windings.
Inventors
- 👤 Charles D Syverson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:38
CPC Classifications
H; H02; H02P; H02P9/00; H02P9/14; H02P9/38; H02K; H02K19/00; H02K19/16; H02K19/38
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
169 words
An alternating current generator the combination comprising: a magnetic core having a stator and a rotor; an a-c output winding wound on the stator of said magnetic core and having a fixed number of poles; a d-c main field winding wound on the rotor of said magnetic core and operable to induce an alternating current in said a-c output winding when the rotor is rotated and a direct current is supplied to the d-c main field winding; a rectifier circuit mounted on said rotor and connected to conduct direct current to said d-c main field winding when supplied with an alternating current; a d-c excitation winding wound on the stator of said magnetic core and having twice as many poles as said a-c output winding; and a field excitation winding wound on the rotor of said magnetic core, connected to said rectifier circuit, and operable to generate an alternating current to said rectifier circuit when the rotor is rotated and the d-c excitation winding is supplied with direct current.
Claim 2
Dependent Claim
169 words
An alternating current generator the combination comprising: a magnetic core having a stator and a rotor; an a-c output winding wound on the stator of said magnetic core and having a fixed number of poles; a d-c main field winding wound on the rotor of said magnetic core and operable to induce an alternating current in said a-c output winding when the rotor is rotated and a direct current is supplied to the d-c main field winding; a rectifier circuit mounted on said rotor and connected to conduct direct current to said d-c main field winding when supplied with an alternating current; a d-c excitation winding wound on the stator of said magnetic core and having twice as many poles as said a-c output winding; and a field excitation winding wound on the rotor of said magnetic core, connected to said rectifier circuit, and operable to generate an alternating current to said rectifier circuit when the rotor is rotated and the d-c excitation winding is supplied with direct current.
Claim 3
Dependent Claim
47 words
The alternating current generator as recited in claim 1, wherein the poles of said a-c output winding are equally spaced around the axis of rotation of said rotor, and the poles of said d-c excitation winding are equally spaced around the axis of rotation of said rotor.
Claim 4
Dependent Claim
27 words
The alternating current generator as recited in claim 2, wherein the poles of said a-c output winding are in alignment with poles of said d-c excitation winding.
Claim 5
Dependent Claim
36 words
The alternating current generator as recited in claim 2, wherein the rotor of said magnetic core has a pair of pole pieces and said d-c main field winding has two poles aligned with said pole pieces.
Claim 6
Dependent Claim
33 words
The alternating current generator as recited in claim 4, wherein said field excitation winding is comprised of a plurality of phase windings connected to generate a polyphase alternating current to said rectifier circuit.
Claim 7
Dependent Claim
39 words
The alternating current generator as recited in claim 5, wherein said phase windings each have a pair of poles and the resulting poles of said field excitation winding are asymmetrically arranged around the axis of rotation of said rotor.
References Cited (Backward Citations)
US3059168A
Cited
US3154708A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-07-11 | 1976-01-10 | 1976-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-11 | 1980-01-10 | 1980-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-11 | 1984-01-10 | 1984-07-11 | $7700.00 | Window Closed / Lapsed |