US4400140A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Compact fan
Assignee: Papst Licensing GmbH and Co KG
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Filing: 1981-01-22
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Granted: 1983-08-23
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Expires: 2001-01-22
Abstract
Abstract The fan comprises a fan housing surrounding a fan wheel which is coaxial with the fan's drive motor. The drive motor is a permanent-capacitor induction motor with squirrel-cage rotor, the stator of which includes a main winding and an auxiliary winding, the former energized directly from a one-phase A.C. power source, the latter energized through the intermediary of a capacitor, the capacitor serving to produce a second or auxiliary phase of energization for the sake of a rotating stator field. In order that the capacitor not consume valuable space within the fan, especially in the case of a small fan, the capacitor is a wound capacitor of generally annular overall configuration, mounted coaxial with the drive motor radially outward of the drive motor.
Inventors
- 👤 Georg F. Papst
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 12:50
CPC Classifications
H; H02; H02K; H02K17/00; H02K17/02; H02K17/04; H02K17/08; F; F04; F04D; F04D25/00; F04D25/02; F04D25/06; F04D25/0606
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
133 words
A compact fan, comprising an induction drive motor with a stator winding; a fan wheel driven by the drive motor, the fan wheel having an external diameter; a fan housing in which the drive motor is mounted; and a phase-shifting capacitor connected to the stator winding, the capacitor including conductive strips wound up together into an annulus with an internal diameter greater than said external diameter, the annulus being generally coaxial with the drive motor, the capacitor being connecting at corresponding ends of the strips to the stator winding and thereby forming a quasibifilar network connected thereto while being otherwise insulated from the drive motor, said fan housing including a part that surrounds and is generally centered about the fan wheel, said capacitor encircling the fan wheel and being mounted on said part.
Claim 2
Dependent Claim
133 words
A compact fan, comprising an induction drive motor with a stator winding; a fan wheel driven by the drive motor, the fan wheel having an external diameter; a fan housing in which the drive motor is mounted; and a phase-shifting capacitor connected to the stator winding, the capacitor including conductive strips wound up together into an annulus with an internal diameter greater than said external diameter, the annulus being generally coaxial with the drive motor, the capacitor being connecting at corresponding ends of the strips to the stator winding and thereby forming a quasibifilar network connected thereto while being otherwise insulated from the drive motor, said fan housing including a part that surrounds and is generally centered about the fan wheel, said capacitor encircling the fan wheel and being mounted on said part.
Claim 3
Dependent Claim
33 words
The fan defined by claim 1, wherein the capacitor is located in such a location that air blown by the fan wheel is blown onto the capacitor after being blown by the fan.
Claim 4
Dependent Claim
29 words
The fan defined by claim 2, wherein the fan housing has an intake end, an exhaust end, and further has a radially inwardly extending projection at the intake end.
Claim 5
Dependent Claim
20 words
The fan defined by claim 3, wherein the projection is formed into an annular shoulder against which the capacitor bears.
Claim 6
Dependent Claim
26 words
The fan defined by claim 4, wherein the shoulder has an internal diameter which is at least as large as the internal diameter of the capacitor.
Claim 7
Dependent Claim
22 words
The fan defined by claim 1, wherein the capacitor is pre-wound and is detachably securable to the fan as a discrete component.
Claim 8
Dependent Claim
13 words
The fan defined by claim 1, wherein the fan is an axial-flow blower.
Claim 9
Dependent Claim
21 words
The fan defined by claim 1, wherein the drive motor has an axial length which is surrounded by the fan housing.
Claim 10
Dependent Claim
15 words
The fan defined by claim 1, wherein the annulus is of a generally circular configuration.
Claim 11
Dependent Claim
59 words
The fan defined by claim 1, wherein the fan housing has radially extending mounting spokes upon which the drive motor is mounted, and wherein the fan further includes power-supply conductors mounted upon one of the mounting spokes, and wherein the fan still further includes connecting conductors located adjacent the power-supply conductors and connecting the capacitor to the stator winding.
Claim 12
Dependent Claim
14 words
The fan defined by claim 1, wherein the drive motor is a squirrel-cage motor.
Claim 13
Dependent Claim
145 words
A compact fan comprising, a fan housing; an induction drive motor mounted in the fan housing; a fan wheel driven by the drive motor, the fan housing surrounding the fan wheel, the drive motor including a stator winding and the fan including a phase-shifting capacitor electrically connected to the stator winding for generation of an auxiliary phase of energization, the capacitor being a wound capacitor of annular overall configuration surrounding and generally coaxial with the drive motor and having an internal diameter greater than the external diameter of the fan wheel, the wound capacitor comprising a pair of wound-up electrode strips each electrically connected to the stator winding, the electrical connection to the stator winding being at the same end of both electrode strips as considered in the direction of winding of the strips to thereby obtain a quasibifilar electrical configuration of the wound capacitor.
Claim 14
Dependent Claim
145 words
A compact fan comprising, a fan housing; an induction drive motor mounted in the fan housing; a fan wheel driven by the drive motor, the fan housing surrounding the fan wheel, the drive motor including a stator winding and the fan including a phase-shifting capacitor electrically connected to the stator winding for generation of an auxiliary phase of energization, the capacitor being a wound capacitor of annular overall configuration surrounding and generally coaxial with the drive motor and having an internal diameter greater than the external diameter of the fan wheel, the wound capacitor comprising a pair of wound-up electrode strips each electrically connected to the stator winding, the electrical connection to the stator winding being at the same end of both electrode strips as considered in the direction of winding of the strips to thereby obtain a quasibifilar electrical configuration of the wound capacitor.
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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) | 1986-08-22 | 1987-02-21 | 1987-08-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-08-22 | 1991-02-21 | 1991-08-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-08-22 | 1995-02-21 | 1995-08-23 | $7700.00 | Window Closed / Lapsed |