US4532449A
Expired / Lapsed
US
⏱️ 0.0 years remaining
DC motor
Assignee: Canon Inc
•
Filing: 1982-12-09
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Granted: 1985-07-30
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Expires: 2002-12-09
Abstract
Abstract A DC cored motor in which the rotor core has an odd number of slots to accept a corresponding number of coils which are connected to a commutator with a doubled number of segments, characterized by a combination of 2n+1 slots with 2n magnetic poles in the field magnet, wherein n is an integer equal to or larger than 2.
Inventors
- 👤 Kanemasa Aoki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 11:23
CPC Classifications
H; H02; H02K; H02K23/00; H02K23/26; H02K23/32; H02K13/00; H02K13/04; H02K13/06
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
153 words
A DC cored motor comprising a motor case, a rotary shaft supported by the motor case an iron core armature fixed on the rotary shaft and having 2n+1 equally spaced protruding iron poles, where n is a whole number equal to or greater than 2; said protruding iron poles respectively supporting armature coils, each armature coil being wound around a respective protruding pole with no overlapping of said coils; a field magnet arranged around the outside of said armature coils and having 2n equally spaced poles; a commutator mounted on said rotary shaft and divided into 2(2n+1) commutator segments for supplying said armature coils with electric power through a commutator brush; each alternate commutator segment being connected to one end of each of two coils which are separated from each other by an intermediate coil; and each commutator segment being electrically connected to another commutator segment displaced therefrom by 180° around said commutator.
Claim 2
Dependent Claim
153 words
A DC cored motor comprising a motor case, a rotary shaft supported by the motor case an iron core armature fixed on the rotary shaft and having 2n+1 equally spaced protruding iron poles, where n is a whole number equal to or greater than 2; said protruding iron poles respectively supporting armature coils, each armature coil being wound around a respective protruding pole with no overlapping of said coils; a field magnet arranged around the outside of said armature coils and having 2n equally spaced poles; a commutator mounted on said rotary shaft and divided into 2(2n+1) commutator segments for supplying said armature coils with electric power through a commutator brush; each alternate commutator segment being connected to one end of each of two coils which are separated from each other by an intermediate coil; and each commutator segment being electrically connected to another commutator segment displaced therefrom by 180° around said commutator.
Claim 3
Dependent Claim
14 words
A DC cored motor according to claim 1 wherein n is equal to two.
Claim 4
Dependent Claim
44 words
A DC cored motor according to claim 1 wherein the armature coils are located near the periphery of the core and form therewith a space between the armature coils and the rotary shaft; and wherein a spark extinguishing element is positioned in said space.
References Cited (Backward Citations)
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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) | 1988-07-29 | 1989-01-28 | 1989-07-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-07-29 | 1993-01-28 | 1993-07-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-07-29 | 1997-01-28 | 1997-07-30 | $7700.00 | Window Closed / Lapsed |