US4382214A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Direct current motor
Assignee: Individual
•
Filing: 1980-11-07
•
Granted: 1983-05-03
•
Expires: 2000-11-07
Abstract
Abstract A direct current motor comprising the field magnet pole of a permanent magnet and an armature having a plurality of armature windings. The field magnet pole has at least four magnetic poles and the angular spacing is equal to 360 degrees divided by the number of the magnetic poles, and at least one of the armature windings has an angular spacing which is (2n - 1) times the width of the field magnet pole, where n is a positive integer of 2 or more, and control means for successive switching, rendering said armature windings conductive, is provided.
Inventors
- 👤 Itsuki Ban
- 👤 Manabu Shiraki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:40
CPC Classifications
H; H02; H02K; H02K29/00; H02K29/06; H02K29/08
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
97 words
In a direct current motor comprising a field magnet having multiple magnetic poles and an armature having a plurality of armature windings, the improvement wherein said field magnet has at least four magnetic poles and the angular spacing is equal to 360 degrees divided by the number of the magnetic poles, and at least one of said armature windings has an angular spacing which is (2n-1) times the width of said field magnetic pole, where n is a positive integer of 2 or more, and control means for successive switching, rendering said armature windings conductive, is provided.
Claim 2
Dependent Claim
97 words
In a direct current motor comprising a field magnet having multiple magnetic poles and an armature having a plurality of armature windings, the improvement wherein said field magnet has at least four magnetic poles and the angular spacing is equal to 360 degrees divided by the number of the magnetic poles, and at least one of said armature windings has an angular spacing which is (2n-1) times the width of said field magnetic pole, where n is a positive integer of 2 or more, and control means for successive switching, rendering said armature windings conductive, is provided.
Claim 3
Dependent Claim
29 words
A direct current motor as claimed in claim 1, wherein said armature windings are disposed so as not to be superimposed on each other and constitute a coreless armature.
Claim 4
Dependent Claim
47 words
A direct current motor as claimed in claim 1, wherein said control means comprises position sensors for sensing the rotating position of a magnet rotor, and a semi-conductor switching device for controlling the current which flows through an armature through a detection output from said position sensors.
Claim 5
Dependent Claim
64 words
A direct current motor as claimed in claim 1, wherein, in said control means, the terminals of said armature windings are connected to predetermined commutator bars, and an electric current is supplied to a commutator comprising a plurality of commutator bars and to said armature windings from positive and negative D.C. power sources through brushes which are in sliding contact with said commutator bars.
References Cited (Backward Citations)
US3733506A
Cited
US4107587A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-05-02 | 1986-11-01 | 1987-05-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-05-02 | 1990-11-01 | 1991-05-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-05-02 | 1994-11-01 | 1995-05-03 | $7700.00 | Window Closed / Lapsed |