US5006745A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyphase direct current motor
Assignee: Samsung Electro Mechanics Japan Advanced Technology Co Ltd
•
Filing: 1989-08-03
•
Granted: 1991-04-09
•
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 12:37
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.
References Cited (Backward Citations)
US3794870A
Cited
US4013909A
Cited
US3909646A
Cited
US4338534A
Cited
JPS6114743A
Cited
US4692645A
Cited
US4672251A
Cited
JPS62123944A
Cited
JPS6419949A
Cited
US4774428A
Cited
JPS63294243A
Cited
JPS63316648A
Cited
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 |