Patent US3966396B1 successfully refreshed from Google Patents.
US5288216A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fan unit for generating gas streams
Assignee: US Philips Corp
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Filing: 1993-06-14
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Granted: 1994-02-22
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Expires: 2013-06-14
Abstract
Abstract The invention relates to a fan unit for generating gas streams, in particular for vacuum cleaners, which unit comprises a motor (4) and an impeller wheel (1) which is also electromagnetically active and in conjunction with electromagnetically active parts (19) of the motor stator (3) generates the torque of the impeller wheel via an air gap (11) formed between radial surfaces of the impeller wheel and the motor stator, the electromagnetically active part of the impeller wheel (1) being a conductive disc (7) which is arranged in a radial plane and which has one radial surface (8) bounding the air gap (11) at the rotor side, and the air gap being bounded at the stator side by planar stator poles (19) formed on a radial bounding surface (12) of an iron cylinder (15) by the provision of radial slots (17) in which the coils (20) are arranged.
Inventors
- 👤 Ekkehard Bolte
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 21:06
CPC Classifications
F; F04; F04D; F04D25/00; F04D25/02; F04D25/06; F04D25/0606; F04D25/0653; H; H02; H02K; H02K7/00; H02K7/14
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
173 words
A fan unit for generating gas streams, in particular for vacuum cleaners, which unit comprises a motor (4) having a motor axis and an impeller wheel (1) which is also electromagnetically active and in conjunction with electromagnetically active parts (19) of the motor stator (3) generates the torque of the impeller wheel via an air gap (11) extending perpendicular to the motor axis, and formed between surfaces of the impeller wheel (1) and the motor stator (3), wherein the electromagnetically active part of the impeller wheel (1) is a conductive disc (7) which is arranged in a plane extending perpendicular to the motor axis and which has one surface (8) extending perpendicular to the motor axis and bounding the air gap (11) at the rotor side, and at the stator side the air gap is bounded by planar stator poles (19) formed on a radial bounding surface (12) of an iron cylinder (15), extending perpendicular to the motor axis, by the provision of radial slots (17) in which the coils (20) are arranged.
Claim 2
Dependent Claim
173 words
A fan unit for generating gas streams, in particular for vacuum cleaners, which unit comprises a motor (4) having a motor axis and an impeller wheel (1) which is also electromagnetically active and in conjunction with electromagnetically active parts (19) of the motor stator (3) generates the torque of the impeller wheel via an air gap (11) extending perpendicular to the motor axis, and formed between surfaces of the impeller wheel (1) and the motor stator (3), wherein the electromagnetically active part of the impeller wheel (1) is a conductive disc (7) which is arranged in a plane extending perpendicular to the motor axis and which has one surface (8) extending perpendicular to the motor axis and bounding the air gap (11) at the rotor side, and at the stator side the air gap is bounded by planar stator poles (19) formed on a radial bounding surface (12) of an iron cylinder (15), extending perpendicular to the motor axis, by the provision of radial slots (17) in which the coils (20) are arranged.
Claim 3
Dependent Claim
20 words
A fan unit as claimed in claim 1, wherein the iron cylinder (15) is made of a coiled iron band.
Claim 4
Dependent Claim
23 words
A fan unit as claimed in claim 1, wherein the conductive disc (7) of the rotor is a disc of the impeller wheel.
Claim 5
Dependent Claim
18 words
A fan unit as claimed in claim 3, wherein the electrically conductive disc (7) is made of aluminum.
Claim 6
Dependent Claim
38 words
A fan unit as claimed in claim 1, wherein the electrically conductive disc (7) of the rotor is backed with a backing disc (13) of a high-permeability material at its side which is remote from the air gap.
Claim 7
Dependent Claim
18 words
A fan unit as claimed in claim 5, wherein the backing disc (13) is made of solid iron.
Claim 8
Dependent Claim
29 words
A fan unit as claimed in claim 6, wherein for the purpose of reducing eddy currents the magnetically conductive backing disc (13) is made of a coiled electric-sheet band.
Claim 9
Dependent Claim
22 words
A fan unit as claimed in claim 3, wherein the disc (7) of the impeller wheel (1) is made of solid iron.
Claim 10
Dependent Claim
31 words
A fan unit as claimed in claim 8, characterised in that the outer and inner edges of the circular solid-iron disc are in contact with parts of a highly conductive material.
Claim 11
Dependent Claim
21 words
A fan unit as claimed in claim 9, wherein the parts of a highly conductive material are constructed as copper rings.
Claim 12
Dependent Claim
35 words
A fan unit as claimed in claim 1, wherein the conductive disc (7) of the impeller wheel (1) is constructed as a squirrel cage made of a solid permeable material or a lamellar permeable material.
Claim 13
Dependent Claim
36 words
A fan unit as claimed in claim 1, wherein the axial-flow induction motor (4) is energized by means of a frequency changer (29), the speed setting being derived from process-dependent nominal values and adjustable set-point values.
Claim 14
Dependent Claim
20 words
A fan unit as claimed in claim 12, wherein the set-point values are the primary frequency and the stator current.
Claim 15
Dependent Claim
17 words
A fan unit as claimed in claim 12, wherein the actual speed value is a measurement value.
Claim 16
Dependent Claim
20 words
A fan unit as claimed in claim 12, wherein the set-point values are the primary frequency and the stator voltage.
Claim 17
Dependent Claim
18 words
A fan unit as claimed in claim 12, wherein the actual speed value is derived from electrical parameters.
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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) | 1997-02-21 | 1997-08-23 | 1998-02-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-02-21 | 2001-08-23 | 2002-02-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-02-21 | 2005-08-23 | 2006-02-22 | $7700.00 | Window Closed / Lapsed |