Patent US5504382A successfully refreshed from Google Patents.
US5504382A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Field controlled permanent magnet alternator
Assignee: Unison Industries LLC
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Filing: 1994-01-24
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Granted: 1996-04-02
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Expires: 2014-01-24
Abstract
Abstract An alternator, or the like including a stator assembly and a rotor assembly within the stator assembly, wherein the stator assembly includes a pair of axially spaced core sections with a stationary field coil located therebetween. The field coil is formed of convolutions extending circumferentially about the axis of the device. The rotor assembly has a homopolar core with a pair of axially spaced pole sections in locations corresponding to the respective stator core sections. A central yoke portion extends between the two pole sections and is axially aligned within the field coil. A plurality of permanent magnets are mounted circumferentially on each of the pole sections at symmetrically spaced locations between pole sectors of the respective section.
Inventors
- 👤 Michael J. Douglass
- 👤 Scot A. Webb
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 12:10
CPC Classifications
H; H02; H02K; H02K1/00; H02K1/06; H02K1/22; H02K1/27; H02K1/2706; H02K1/272; H02K1/274; H02K1/2753; H02K1/278; H02K21/00; H02K21/02; H02K21/04; H02K21/046; H02K21/12; H02K21/14; H02K21/20
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
152 words
An alternator including a stator housing having a central axis, a coaxial stator assembly retained within said housing and a coaxial rotor assembly within said stator assembly, said stator assembly having: a pair of axially spaced core sections formed of ferromagnetic material, stator yoke means connecting said core sections, a central section between said core sections and including a stationary field coil formed of convolutions extending circumferentially about said axis, and axially extending stator windings for said core sections; said rotor assembly having: a core formed of ferromagnetic material, with a pair of axially spaced pole sections operatively associated with said core sections and having a plurality of radially extending pole sectors, rotor yoke means extending between said pole sections and operatively associated with said field coil, a plurality of permanent magnets mounted circumferentially on each of said pole sections between said sectors, and retainer sleeve means located around said pole sections.
Claim 2
Dependent Claim
152 words
An alternator including a stator housing having a central axis, a coaxial stator assembly retained within said housing and a coaxial rotor assembly within said stator assembly, said stator assembly having: a pair of axially spaced core sections formed of ferromagnetic material, stator yoke means connecting said core sections, a central section between said core sections and including a stationary field coil formed of convolutions extending circumferentially about said axis, and axially extending stator windings for said core sections; said rotor assembly having: a core formed of ferromagnetic material, with a pair of axially spaced pole sections operatively associated with said core sections and having a plurality of radially extending pole sectors, rotor yoke means extending between said pole sections and operatively associated with said field coil, a plurality of permanent magnets mounted circumferentially on each of said pole sections between said sectors, and retainer sleeve means located around said pole sections.
Claim 3
Dependent Claim
37 words
An alternator as defined in claim 1 including an axially extending spool formed of dielectric material located in said central section and defining an annular recess facing radially outward, said field coil being located in said recess.
Claim 4
Dependent Claim
26 words
An alternator as defined in claim 2 wherein the axial length of said spool is about equal to the axial length of said rotor yoke means.
Claim 5
Dependent Claim
22 words
An alternator as defined in claim 3 wherein said windings of said stator extend axially through said central section adjacent said spool.
Claim 6
Dependent Claim
15 words
An alternator as defined in claim 1 wherein said rotor assembly has a homopolar core.
Claim 7
Dependent Claim
18 words
An alternator as defined in claim 1 wherein said pole sections are formed of a plurality of laminations.
Claim 8
Dependent Claim
18 words
An alternator as defined in claim 1 wherein said core sections are formed of a plurality of laminations.
Claim 9
Dependent Claim
28 words
An alternator as defined in claim 7 wherein said core sections are provided with stator teeth extending radially inwardly and defining-axially extending spaces for said stator windings therebetween.
Claim 10
Dependent Claim
27 words
An alternator as defined in claim 1 wherein current is applied to said field coil and said current is regulated to control output voltage from said alternator.
Claim 11
Dependent Claim
29 words
An alternator as defined in claim 1 wherein said retainer sleeve means comprises a pair of retainer sleeves, one of which is fitted around each of said pole section.
Claim 12
Dependent Claim
16 words
An alternator as defined in claim 10 wherein said retainer sleeves are formed of ferromagnetic material.
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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) | 1999-04-02 | 1999-10-02 | 2000-04-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-04-02 | 2003-10-02 | 2004-04-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-04-02 | 2007-10-02 | 2008-04-02 | $7700.00 | Window Closed / Lapsed |