Patent US5006745A successfully refreshed from Google Patents.
US5006745A
Expired / Lapsed
US
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Polyphase direct current motor
Assignee: Samsung Electro Mechanics Japan Advanced Technology Co Ltd
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Filing: 1989-08-03
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Granted: 1991-04-09
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Expires: 2009-08-03
Abstract
Abstract A three-phase direct-current motor has a field magnet having P field poles positioned as a circular array at angularly equally spaced intervals, and an armature having cores providing N slots with three-phase coils disposed therein, either the field magnet or the armature being rotatable with respect to the other. P and N are defined by P=2(4n+3) and N=3(2n+1) where n is an integer of 1 or more, and being selected such that the least common multiple of N and P is equal to NxP. Alternatively, P and N are defined by P=2(3n+/-1) and N=6n where n is an integer of 2 or more.
Inventors
- 👤 Akira Nishio
- 👤 Masato Nakamura
- 👤 Akihiro Mochizuki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 15:40
CPC Classifications
H; H02; H02K; H02K21/00; H02K21/12; H02K21/22; H02K29/00; H02K29/03
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
94 words
A three-phase direct-current motor comprising: a field magnet having P field poles positioned as a circular array at angularly equally spaced intervals; an armature having cores as angularly equally spaced N protruding poles providing N slots therebetween the three-phase coils disposed therein; either said field magnet or said armature being rotatable with respect to the other; and P and N being defined by P=2(4n+3) and N=3(2n+1) wherein n is an integer of 1 or more, and being selected such that the least common multiple of N and P is equal to N x P.
Claim 2
Dependent Claim
94 words
A three-phase direct-current motor comprising: a field magnet having P field poles positioned as a circular array at angularly equally spaced intervals; an armature having cores as angularly equally spaced N protruding poles providing N slots therebetween the three-phase coils disposed therein; either said field magnet or said armature being rotatable with respect to the other; and P and N being defined by P=2(4n+3) and N=3(2n+1) wherein n is an integer of 1 or more, and being selected such that the least common multiple of N and P is equal to N x P.
Claim 3
Dependent Claim
35 words
A three-phase direct-current motor according to claim 1, wherein the coils disposed in said N slots are wound around every other core, totaling N/3 cores, in successively opposite directions, thus providing each of three phases.
Claim 4
Dependent Claim
75 words
A three-phase direct-current motor comprising: a field magnet having P field poles positioned as a circular array at angularly equally spaced intervals; an armature having cores as angularly equally spaced N protruding poles providing N slots therebetween with three-phase coils disposed therein; either said field magnet or said armature being rotatable with respect to the other; and P and N being defined by P=2(3n±3) and N=6n wherein n is an integer of 2 or more.
Claim 5
Dependent Claim
75 words
A three-phase direct-current motor comprising: a field magnet having P field poles positioned as a circular array at angularly equally spaced intervals; an armature having cores as angularly equally spaced N protruding poles providing N slots therebetween with three-phase coils disposed therein; either said field magnet or said armature being rotatable with respect to the other; and P and N being defined by P=2(3n±3) and N=6n wherein n is an integer of 2 or more.
Claim 6
Dependent Claim
129 words
A polyphase direct-current motor comprising: a field magnet having angularly equally spaced P field poles which comprise alternate north and south poles; an armature having cores as angularly equally spaced N protruding poles providing N slots therebetween the φ phase coils disposed therein; either said field magnet or said armature being rotatable with respect to the other; P and N being defined by P=2(nφ±1) and N=2nφwhere n is an integer of 2 or more; each of said coils being wound around a first set of n adjacent cores in successively opposite directions, and then would around a second set of n cores, which are positioned symmetrically and in phase with the first set of n cores, thus providing one phase that is composed of a total of 2n cores.
Claim 7
Dependent Claim
129 words
A polyphase direct-current motor comprising: a field magnet having angularly equally spaced P field poles which comprise alternate north and south poles; an armature having cores as angularly equally spaced N protruding poles providing N slots therebetween the φ phase coils disposed therein; either said field magnet or said armature being rotatable with respect to the other; P and N being defined by P=2(nφ±1) and N=2nφwhere n is an integer of 2 or more; each of said coils being wound around a first set of n adjacent cores in successively opposite directions, and then would around a second set of n cores, which are positioned symmetrically and in phase with the first set of n cores, thus providing one phase that is composed of a total of 2n cores.
Claim 8
Dependent Claim
103 words
A polyphase direct-current motor comprising: a field magnet having angularly equally spaced P field poles which comprise alternate north and south poles; an armature having cores as angularly equally spaced N protruding poles providing N slots therebetween the φ' phase coils disposed therein (φ' is an even number of 4 or more); either said field magnet or said armature being rotatable with respect to the other; P and N being defined by P=2{nφ'/2)±156 and N=nφ' 2nφ' where n is an integer of 2 or more; each of said coils being wound around n adjacent cores in successively opposite directions, thus providing one phase.
Claim 9
Dependent Claim
103 words
A polyphase direct-current motor comprising: a field magnet having angularly equally spaced P field poles which comprise alternate north and south poles; an armature having cores as angularly equally spaced N protruding poles providing N slots therebetween the φ' phase coils disposed therein (φ' is an even number of 4 or more); either said field magnet or said armature being rotatable with respect to the other; P and N being defined by P=2{nφ'/2)±156 and N=nφ' 2nφ' where n is an integer of 2 or more; each of said coils being wound around n adjacent cores in successively opposite directions, thus providing one phase.
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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) | 1994-04-08 | 1994-10-08 | 1995-04-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-04-08 | 1998-10-08 | 1999-04-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-04-08 | 2002-10-08 | 2003-04-09 | $7700.00 | Window Closed / Lapsed |