US3737693A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Outer-rotor type d.c. motors
Assignee: Olympus Corp
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Filing: 1971-12-28
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Granted: 1973-06-05
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Expires: 1991-12-28
Abstract
Abstract An outer-rotor type D.C. motor wherein the rotor comprises a cylindrical yoke, a plurality of magnetic poles which are each magnetically coupled at one end with the inner wall of the yoke and provided at the other end with a pole piece and a bridge magnetically coupling said pole piece with the adjacent one; and armature coils wound about bobbins detachably fitted to said magnetic poles.
Inventors
- 👤 M Mishima
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:09
CPC Classifications
H; H02; H02K; H02K23/00; H02K23/40
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
163 words
An outer-rotor type D.C. motor comprising a stator consisting of a columnar magnet having a bearing introduced through its central axis; a shaft inserted into said bearing; a rotor including a bottom plate, to the center of which there is fixed one end of said shaft, a cylindrical yoke, the open end of which is closed by said bottom plate, a plurality of magnetic poles magnetically coupled at one end with the inner wall of said yoke and provided at the other end with a pole piece, each of said poles having a substantially uniform width and thickness throughout its length, a plurality of magnetic bridges spanned across said other end of the adjacent magnetic poles to prevent occurrence of the cogging phenomenon due to magnetic bend between said stator and magnetic poles and separate armature coils wound about bobbins removably mounted on the individual magnetic poles; and a commutator mounted on said shaft so as to be connected to said armature coils.
Claim 2
Dependent Claim
163 words
An outer-rotor type D.C. motor comprising a stator consisting of a columnar magnet having a bearing introduced through its central axis; a shaft inserted into said bearing; a rotor including a bottom plate, to the center of which there is fixed one end of said shaft, a cylindrical yoke, the open end of which is closed by said bottom plate, a plurality of magnetic poles magnetically coupled at one end with the inner wall of said yoke and provided at the other end with a pole piece, each of said poles having a substantially uniform width and thickness throughout its length, a plurality of magnetic bridges spanned across said other end of the adjacent magnetic poles to prevent occurrence of the cogging phenomenon due to magnetic bend between said stator and magnetic poles and separate armature coils wound about bobbins removably mounted on the individual magnetic poles; and a commutator mounted on said shaft so as to be connected to said armature coils.
Claim 3
Dependent Claim
32 words
The motor according to claim 1 wherein the rotor consists of an integral body of said magnetic poles; pole pieces and magnetic bridges are fixed to the inner wall of said yoke.
Claim 4
Dependent Claim
37 words
The motor according to claim 2 wherein the magnetic pole unit is prepared from laminated thin magnetic elements, each of which consists of an integral formation of magnetic pole portions, pole piece portions and magnetic bridge portions.
Claim 5
Dependent Claim
36 words
The motor according to claim 2 wherein the yoke consists of a blind cylindrical support made of insulating material and an annular yoke body fixed to the inner wall of the open end of said support.
Claim 6
Dependent Claim
36 words
The motor according to claim 1 wherein the yoke and magnetic poles of the rotor are formed in integral body and the pole pieces and magnetic bridges of said rotor are also formed in integral body.
Claim 7
Dependent Claim
47 words
The motor according to claim 1 wherein the rotor has nine magnetic poles; each armature coil consists of first and second coil sections; and the first and second coil sections of the alternate armature coils are connected in series to two adjacent commutator bars of the commutator.
Claim 8
Dependent Claim
77 words
The motor according to claim 1 wherein the rotor has nine magnetic poles; each armature coil has first, second and third coil sections; the first coil section of the first armature coil, the second coil section of the second armature coil and the third coil section of the third armature coil are connected in series to two adjacent commutator bars of the commutator, said armature coils being all disposed parallel with the rotating direction of the rotor.
Claim 9
Dependent Claim
21 words
The motor according to claim 1 wherein the armature coils are wound about the bobbins removablY mounted on the magnetic poles.
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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) | 1976-06-04 | 1976-12-04 | 1977-06-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-04 | 1980-12-04 | 1981-06-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-04 | 1984-12-04 | 1985-06-05 | $7700.00 | Window Closed / Lapsed |