Patent US3845334A successfully refreshed from Google Patents.
US3845334A
Expired / Lapsed
US
⏱️ 0.0 years remaining
D. c. motor arrangement
Assignee: Mitsumi Electric Co Ltd
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Filing: 1972-11-24
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Granted: 1974-10-29
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Expires: 1992-11-24
Abstract
Abstract A d.c. motor arrangement is provided which comprises a rotatable magnetic rotor means and a stationary armature means. A plurality of magnetically responsive switching means are positioned radially and circumferentially around the axis of the rotor means for controlling the energization of the armature means. A magnetic means positioned in proximity to the switching means is rotatable about the axis of the rotor means, for operating the switching means. The rotation of the rotor means rotates the magnetic switching means such that it sequentially operates the switching means, thereby energizing the armature means in a predetermined sequence.
Inventors
- 👤 H Harada
- 👤 S Oyama
- 👤 T Fujitsuka
- 👤 K Yamashita
- 👤 T Sagara
- 👤 T Sekino
- 👤 M Takanashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:18
CPC Classifications
H; H02; H02K; H02K29/00; H02K29/06
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
160 words
A dc motor comprising: a. rotatable magnetic rotor means; b. stationary armature means; c. a plurality of magnetically responsive switching means positioned radially and circumferentially around the axis of said rotor means, for controlling the energization of said armature means; and, d. magnetic means positioned in proximity to said switch means and rotatable about the axis of said rotor means, for operating said switching means wherein the rotation of said rotor means rotates said magnetic means such that said magnetic means sequentially operates said switching means thereby energizing said armature means in a predetermined sequence, said magnetic means comprising the end face of said rotor means and a shield means covering a portion of said end face of said rotor means for shielding the switching means from the magnetic field of the covered portion of said rotor means wherein said switching means are operated only by the portion of said rotor means which is not shielded by said shield means.
Claim 2
Dependent Claim
160 words
A dc motor comprising: a. rotatable magnetic rotor means; b. stationary armature means; c. a plurality of magnetically responsive switching means positioned radially and circumferentially around the axis of said rotor means, for controlling the energization of said armature means; and, d. magnetic means positioned in proximity to said switch means and rotatable about the axis of said rotor means, for operating said switching means wherein the rotation of said rotor means rotates said magnetic means such that said magnetic means sequentially operates said switching means thereby energizing said armature means in a predetermined sequence, said magnetic means comprising the end face of said rotor means and a shield means covering a portion of said end face of said rotor means for shielding the switching means from the magnetic field of the covered portion of said rotor means wherein said switching means are operated only by the portion of said rotor means which is not shielded by said shield means.
Claim 3
Dependent Claim
18 words
The motor of claim 1 wherein said shield means is fixed to the end of said rotor means.
Claim 4
Dependent Claim
166 words
A dc motor comprising: a. rotatable magnetic rotor means; b. stationary armature means; c. a plurality of magnetically responsive switching means positioned radially and circumferentially around the axis of said rotor means for controlling the energization of said armature means; and, d. magnetic means positioned in proximity to said switch means and rotatable about the axis of said rotor means, for operating said switching means wherein the rotation of said rotor means rotates said magnetic means such that said magnetic means sequentially operates said switching means thereby energizing said armature means in a predetermined sequence, said magnetic means comprising the end portion of said rotor means and shield means, surrounding a portion of the end portion of said rotor means, for shielding said switching means from the magnetic field of the portion of the end portion of said rotor means wherein said switching means are only operated by the portion of the end portion of said rotor means which is not shielded by said shield means.
Claim 5
Dependent Claim
166 words
A dc motor comprising: a. rotatable magnetic rotor means; b. stationary armature means; c. a plurality of magnetically responsive switching means positioned radially and circumferentially around the axis of said rotor means for controlling the energization of said armature means; and, d. magnetic means positioned in proximity to said switch means and rotatable about the axis of said rotor means, for operating said switching means wherein the rotation of said rotor means rotates said magnetic means such that said magnetic means sequentially operates said switching means thereby energizing said armature means in a predetermined sequence, said magnetic means comprising the end portion of said rotor means and shield means, surrounding a portion of the end portion of said rotor means, for shielding said switching means from the magnetic field of the portion of the end portion of said rotor means wherein said switching means are only operated by the portion of the end portion of said rotor means which is not shielded by said shield means.
Claim 6
Dependent Claim
153 words
A dc motor comprising: a. rotatable magnetic rotor means; b. stationary armature means; c. a plurality of magnetically responsive switching means positioned radially and circumferentially around the axis of said rotor means, for controlling the energization of said armature means; and, d. magnetic means positioned in proximity to said switch means and rotatable about the axis of said rotor means, for operating said switching means wherein the rotation of said rotor means rotates said magnetic means such that said magnetic means sequentially operates said switching means thereby energizing said armature means in a predetermined sequence, said magnetic means comprising said rotor means and shield means, surrounding a portion of said rotor means in the axial and circumferential directions for shielding saId switching means from the magnetic field of said rotor means wherein said switching means are only operated by the portion of said rotor means which is not shielded by said shield means.
Claim 7
Dependent Claim
153 words
A dc motor comprising: a. rotatable magnetic rotor means; b. stationary armature means; c. a plurality of magnetically responsive switching means positioned radially and circumferentially around the axis of said rotor means, for controlling the energization of said armature means; and, d. magnetic means positioned in proximity to said switch means and rotatable about the axis of said rotor means, for operating said switching means wherein the rotation of said rotor means rotates said magnetic means such that said magnetic means sequentially operates said switching means thereby energizing said armature means in a predetermined sequence, said magnetic means comprising said rotor means and shield means, surrounding a portion of said rotor means in the axial and circumferential directions for shielding saId switching means from the magnetic field of said rotor means wherein said switching means are only operated by the portion of said rotor means which is not shielded by said shield means.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-10-28 | 1978-04-29 | 1978-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-28 | 1982-04-29 | 1982-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-28 | 1986-04-29 | 1986-10-29 | $7700.00 | Window Closed / Lapsed |