US4832576A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric fan
Assignee: Sanyo Electric Co Ltd
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Filing: 1986-05-22
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Granted: 1989-05-23
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Expires: 2006-05-22
Abstract
Abstract An electric fan comprises a rotary shaft supported on a mounting base plate. The rotary shaft is extended through a cylindrical stator and on a tip of the rotary shaft, the bottom of a cup-shaped rotor yoke as well as an impeller are secured. The stator is enclosed in the rotor yoke, on whose inner wall an anisotropic rotor magnet magnetized in the reverse polarity alternately in its circumferential direction is secured. The stator and the rotor form a DC brushless motor, whereby the impeller is rotated through the rotation of the rotor and the rotary shaft. In the proximity of the rotor magnet, there is provided a hall integrated circuit (IC), through which a rotating position of the rotor may be detected. On the basis of the rotating position signal from the hall IC, a microcomputer controls the current flowing period in such a manner that the current flowing through the stator coil will partly overlap between each phase. A separate microcomputer adjusts the voltage applied to the DC brushless motor and controls the wind velocity.
Inventors
- 👤 Yutaka Deguchi
- 👤 Hideo Momohara
- 👤 Yasuyuki Tsuchida
- 👤 Toshio Ootani
- 👤 Yuji Nakanishi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:57
CPC Classifications
H; H02; H02P; H02P6/00; H02P6/08
Claims Analysis
Total Claims: 28
Claim 1
Independent Claim
241 words
An electric fan, comprising an impeller for producing a wind by its rotation, a DC brushless motor coupled with said impeller at a rotor thereof and including a coil and a magnet, said coil being formed for each phase, a driving means for applying a driving voltage to said coil of said DC brushless motor, said driving means including a plurality of switching elements, each said switching element corresponding to said coil for each said phase, a plurality of magnetic sensing elements disposed relative to said magnet of said DC brushless motor, a phase control mans which sequentially turns-on said plurality of switching elements in response to signals from said magnetic sensing elements to control an applied phase of said coil for each phase, a designating means for designating operating condition, a power control means for controlling an electric power being applied from said driving means based upon designation by said designating means, a rotation number detecting means which detects the rotation number of said DC brushless motor based upon the signals from said magnetic sensing elements, said switching elements being change over in accordance with an angle in electrical degree which is determined based upon a time interval detected by said rotation number detecting means, and a period defining means for defining an overlap time period during which said switching elements being turned on in an overlapped manner when said switching elements being changed over by said phase control means.
Claim 2
Dependent Claim
241 words
An electric fan, comprising an impeller for producing a wind by its rotation, a DC brushless motor coupled with said impeller at a rotor thereof and including a coil and a magnet, said coil being formed for each phase, a driving means for applying a driving voltage to said coil of said DC brushless motor, said driving means including a plurality of switching elements, each said switching element corresponding to said coil for each said phase, a plurality of magnetic sensing elements disposed relative to said magnet of said DC brushless motor, a phase control mans which sequentially turns-on said plurality of switching elements in response to signals from said magnetic sensing elements to control an applied phase of said coil for each phase, a designating means for designating operating condition, a power control means for controlling an electric power being applied from said driving means based upon designation by said designating means, a rotation number detecting means which detects the rotation number of said DC brushless motor based upon the signals from said magnetic sensing elements, said switching elements being change over in accordance with an angle in electrical degree which is determined based upon a time interval detected by said rotation number detecting means, and a period defining means for defining an overlap time period during which said switching elements being turned on in an overlapped manner when said switching elements being changed over by said phase control means.
Claim 3
Dependent Claim
27 words
An electric fan in accordance with claim 1, wherein said period defining means includes means for setting said overlap time period in accordance with a conduction angle.
Claim 4
Dependent Claim
15 words
An electric fan in accordance with claim 2, wherein said period defining includes a switch.
Claim 5
Dependent Claim
35 words
An electric fan in accordance with claim 1, wherein said phase control means includes means for delaying a timing when the switching element being previously turned on i turned off by said overlap time period.
Claim 6
Dependent Claim
40 words
An electric fan in accordance with claim 1, wherein said phase control means includes a first micro-computer, to which the signals from said magnetic sensing elements are inputted and from which the control signal is applied to said driving means.
Claim 7
Dependent Claim
16 words
An electric fan in accordance with claim 1, wherein said designating means includes a manual switch.
Claim 8
Dependent Claim
35 words
An electric fan in accordance with claim 5, wherein said power control means includes a second microcomputer which receives the signal from said designating means and output a control signal for controlling said driving means.
Claim 9
Dependent Claim
24 words
An electric fan in accordance with claim 7, wherein said driving means includes a DC voltage circuit, which is controlled by said second microcomputer.
Claim 10
Dependent Claim
19 words
An electric fan in accordance with claim 1, wherein said DC brushless motor is of an inner rotating type.
Claim 11
Dependent Claim
19 words
An electric fan in accordance with claim 1, wherein said DC brushless motor is of an outer rotating type.
Claim 12
Dependent Claim
34 words
An electric fan in accordance with claim 10, wherein said DC brushless motor includes a stator having said coil and a rotor yoke covering said stator, said magnet being secured inside said rotor yoke.
Claim 13
Dependent Claim
30 words
An electric fan in accordance with claim 11, wherein said magnetic sensing elements are mounted on a first board which is arranged in the proximity of said DC brushless motor.
Claim 14
Dependent Claim
21 words
An electric motor in accordance with claim 12, wherein said first board is covered by said rotor yoke or other casing.
Claim 15
Dependent Claim
34 words
An electric fan in accordance with claim 12, which further comprises a stand for supporting said DC brushless motor and a second board arranged within said stand and being mounted with other circuit components.
Claim 16
Dependent Claim
23 words
An electric fan in accordance with claim 12, wherein on said first board, circuit components other than said magnetic sensing elements are installed.
Claim 17
Dependent Claim
36 words
An electric fan in accordance with claim 15, wherein said other circuit components include components producing the heat and said first board is arranged in the position influenced by an air flow produced by said impeller.
Claim 18
Dependent Claim
25 words
An electric fan in accordance with claim 16, which further comprises a guard surrounding said impeller, wherein said first board is supported by said guard.
Claim 19
Dependent Claim
40 words
An electric fan in accordance with claim 16, which further comprises a guard surrounding said impeller and an ornament disposed on the front of said guard, wherein said DC brushless motor and said first board are mounted on said ornament.
Claim 20
Dependent Claim
17 words
An electric fan in accordance with claim 18, wherein said second board is mounted on said ornament.
Claim 21
Dependent Claim
39 words
An electric fan in accordance with claim 3, wherein said designating means includes a speed setting means for selectively setting a speed of said DC brushless motor and said impeller out of a plurality of predetermined kinds of speeds.
Claim 22
Dependent Claim
53 words
An electric fan in accordance with claim 20, wherein said means for setting said overlap time period includes means for selectively setting an overlap time period out of a plurality kinds of overlap time periods which are predetermined as a function of the time interval of the signals from said magnetic sensing elements.
Claim 23
Dependent Claim
230 words
An electric fan, comprising an impeller; a DC brushless motor having a coil and a magnet for rotating said impeller, said coil being formed for each phase; a plurality of switching elements respectively connected to said coil for each phase for bringing said coil for each phase in conduction state; a plurality of magnetic sensing elements disposed in association with said magnet of said DC brushless motor, form which signals representative of an angle in electrical degree can be outputted; a phase shifting means for shifting a conduction state of said coil for each phase in sequence of phases; speed setting means for setting a speed of said DC brushless motor and thus said impeller, a time interval of said signals from said plurality of magnetic sensing elements being changed in accordance with the speed set by said speed setting means; an overlap time determining means for determining an overlap time in shifting said conduction state of said coil for each phase by said phase shifting means, said overlap time corresponding to an angle in electrical degree which is set based upon the time interval detected in response to the signals from said plurality of magnetic sensing elements, and a driving means for driving said plurality of switching elements in such a manner that said coil of two phases can be simultaneously brought in conduction state by said overlap time.
Claim 24
Dependent Claim
230 words
An electric fan, comprising an impeller; a DC brushless motor having a coil and a magnet for rotating said impeller, said coil being formed for each phase; a plurality of switching elements respectively connected to said coil for each phase for bringing said coil for each phase in conduction state; a plurality of magnetic sensing elements disposed in association with said magnet of said DC brushless motor, form which signals representative of an angle in electrical degree can be outputted; a phase shifting means for shifting a conduction state of said coil for each phase in sequence of phases; speed setting means for setting a speed of said DC brushless motor and thus said impeller, a time interval of said signals from said plurality of magnetic sensing elements being changed in accordance with the speed set by said speed setting means; an overlap time determining means for determining an overlap time in shifting said conduction state of said coil for each phase by said phase shifting means, said overlap time corresponding to an angle in electrical degree which is set based upon the time interval detected in response to the signals from said plurality of magnetic sensing elements, and a driving means for driving said plurality of switching elements in such a manner that said coil of two phases can be simultaneously brought in conduction state by said overlap time.
Claim 25
Dependent Claim
228 words
A motor controller for controlling a DC brushless motor having a coil and a magnet, said coil being formed for each phase, comprising a plurality of switching elements respectively connected to said coil for each phase for bringing said coil for each phase in conduction state; a plurality of magnetic sensing elements disposed in association with said magnet of said DC brushless motor, form which signals representative of an angle in electrical degree can be outputted; a phase shifting means for shifting a conduction state of said coil for each phases in sequence of phases; speed setting means for setting a speed of said DC brushless motor, a time interval of said signals from said plurality of magnetic sensing elements being changed in accordance with the speed set by said speed setting in accordance with the speed set by said speed setting means; an overlap time determining means for determining an overlap time in shifting said conduction state of said coil for each phase by said phase shifting means, said overlap time corresponding to an angle in electrical degree being set based upon the time interval detected in response to the signals from said plurality of magnetic sensing elements, and a driving means for driving said plurality of switching elements such that said coil of two phases can be simultaneously brought in conduction state by said overlap time.
Claim 26
Dependent Claim
228 words
A motor controller for controlling a DC brushless motor having a coil and a magnet, said coil being formed for each phase, comprising a plurality of switching elements respectively connected to said coil for each phase for bringing said coil for each phase in conduction state; a plurality of magnetic sensing elements disposed in association with said magnet of said DC brushless motor, form which signals representative of an angle in electrical degree can be outputted; a phase shifting means for shifting a conduction state of said coil for each phases in sequence of phases; speed setting means for setting a speed of said DC brushless motor, a time interval of said signals from said plurality of magnetic sensing elements being changed in accordance with the speed set by said speed setting in accordance with the speed set by said speed setting means; an overlap time determining means for determining an overlap time in shifting said conduction state of said coil for each phase by said phase shifting means, said overlap time corresponding to an angle in electrical degree being set based upon the time interval detected in response to the signals from said plurality of magnetic sensing elements, and a driving means for driving said plurality of switching elements such that said coil of two phases can be simultaneously brought in conduction state by said overlap time.
Claim 27
Dependent Claim
181 words
A motor controller for controlling a DC brushless motor having a coil and a magnet, said coil being formed for each phase, comprising a plurality of switching elements respectively connected to said coil for each phase for bringing said coil for each phase in conduction state; a plurality of magnetic sensing element disposed in association with said magnet of said DC brushless motor, form which signals representative of an angle in electrical degree can be outputted; a phase shifting means for shifting a conduction state of said coil for each phase in sequence of phases; an overlap time determining means for determining an overlap time in shifting said conduction state of said coil for each phase by said phase shifting means, said overlap time corresponding to an angle in electrical degree which is set based upon a time interval detected in response to the signals from said plurality of magnetic sensing elements, and a driving means for driving said plurality of switching elements such that said coil of two phases can be simultaneously brought in conduction state by said overlap time.
Claim 28
Dependent Claim
181 words
A motor controller for controlling a DC brushless motor having a coil and a magnet, said coil being formed for each phase, comprising a plurality of switching elements respectively connected to said coil for each phase for bringing said coil for each phase in conduction state; a plurality of magnetic sensing element disposed in association with said magnet of said DC brushless motor, form which signals representative of an angle in electrical degree can be outputted; a phase shifting means for shifting a conduction state of said coil for each phase in sequence of phases; an overlap time determining means for determining an overlap time in shifting said conduction state of said coil for each phase by said phase shifting means, said overlap time corresponding to an angle in electrical degree which is set based upon a time interval detected in response to the signals from said plurality of magnetic sensing elements, and a driving means for driving said plurality of switching elements such that said coil of two phases can be simultaneously brought in conduction state by said overlap time.
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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) | 1992-05-22 | 1992-11-21 | 1993-05-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-05-22 | 1996-11-21 | 1997-05-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-05-22 | 2000-11-21 | 2001-05-23 | $7700.00 | Window Closed / Lapsed |