US4861237A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Axial-flow fan apparatus
Assignee: Shicoh Engineering Co Ltd
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Filing: 1986-10-22
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Granted: 1989-08-29
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Expires: 2006-10-22
Abstract
Abstract A light-weighted, inexpensive axial-flow fan apparatus which can prevent axial leakage of a magnetic flux of a brushless motor installed therein. A body member of the apparatus or a motor casing on which the motor is supported is made of a non-magnetic material such as a resin material, and a name plate formed from a magnetic seal is applied to the bottom of the motor casing so as to pass a magnetic flux therethrough.
Inventors
- 👤 Manabu Shiraki
- 👤 Kazuhito Egami
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 13:44
CPC Classifications
H; H02; H02K; H02K7/00; H02K7/14; F; F04; F04D; F04D29/00; F04D29/005; F04D25/00; F04D25/02; F04D25/06; F04D25/0606; F04D25/0653
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
161 words
An axial-flow fan apparatus, said apparatus comprising: a fan casing; a motor casing made of a resin and formed integrally with said fan casing and arranged inside said fan casing, said fan casing and said resin motor casing having stays interposed therebetween; a flattened single-phase energized coreless brushless motor housed within said motor casing, said motor being capable of self-starting through the use of a cogging torque, said motor including a printed circuit board, an air-core type armature coil disposed on said circuit board, a stator armature without a stator yoke arranged on one side of said circuit board, and a rotatable field magnet spaced from said stator armature; and a magnetic seal name plate having desired indications legible on one side thereof, the other side of said name plate being adhesively coupled to the outer bottom face of said motor casing, said name plate preventing axial leakage of magnetic flux from said field magnet of said flattened coreless brushless motor.
Claim 2
Dependent Claim
161 words
An axial-flow fan apparatus, said apparatus comprising: a fan casing; a motor casing made of a resin and formed integrally with said fan casing and arranged inside said fan casing, said fan casing and said resin motor casing having stays interposed therebetween; a flattened single-phase energized coreless brushless motor housed within said motor casing, said motor being capable of self-starting through the use of a cogging torque, said motor including a printed circuit board, an air-core type armature coil disposed on said circuit board, a stator armature without a stator yoke arranged on one side of said circuit board, and a rotatable field magnet spaced from said stator armature; and a magnetic seal name plate having desired indications legible on one side thereof, the other side of said name plate being adhesively coupled to the outer bottom face of said motor casing, said name plate preventing axial leakage of magnetic flux from said field magnet of said flattened coreless brushless motor.
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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) | 1992-08-28 | 1993-02-27 | 1993-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-08-28 | 1997-02-27 | 1997-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-08-28 | 2001-02-27 | 2001-08-29 | $7700.00 | Window Closed / Lapsed |