Patent US5481143A successfully refreshed from Google Patents.
US5481143A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Self starting brushless d.c. motor
Assignee: Individual
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Filing: 1993-11-15
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Granted: 1996-01-02
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Expires: 2013-11-15
Abstract
Abstract A self-starting, brushless direct current motor including a rotor assembly, a stator assembly, the stator assembly including a circular ring member and a plurality of electromagnets positioned circumferentially around the circular ring member, and a triggering mechanism for energizing and deenergizing each of the electromagnets in a predetermined sequence to produce a rotary motion of the rotor assembly.
Inventors
- 👤 Brian K. Burdick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 16:07
CPC Classifications
H; H02; H02K; H02K1/00; H02K1/06; H02K1/12; H02K1/14; H02K1/146; H02K1/148; H02K11/00; H02K11/30; H02K11/33; H02K21/00; H02K21/12; H02K21/22; H02K29/00; H02K29/06; H02K29/10; H02K1/18; H02P; H02P6/00; H02P6/20
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
110 words
A self-starting, brushless direct current motor comprising: (a) a stator assembly; (b) a rotor assembly which is rotatingly disposed within said stator assembly, said rotor assembly comprising a shaft, a slotted disk member, said disk member being connected to a first end of said shaft, and a pair of C-shaped channel members, said channel members being connected to a second end of said shaft; (c) said stator assembly comprising a circular ring member and a plurality of electromagnets positioned circumferentially around said circular ring member; and (d) triggering means for energizing and deenergizing each of said electromagnets in a predetermined sequence to produce a rotary motion of said rotor assembly.
Claim 2
Dependent Claim
110 words
A self-starting, brushless direct current motor comprising: (a) a stator assembly; (b) a rotor assembly which is rotatingly disposed within said stator assembly, said rotor assembly comprising a shaft, a slotted disk member, said disk member being connected to a first end of said shaft, and a pair of C-shaped channel members, said channel members being connected to a second end of said shaft; (c) said stator assembly comprising a circular ring member and a plurality of electromagnets positioned circumferentially around said circular ring member; and (d) triggering means for energizing and deenergizing each of said electromagnets in a predetermined sequence to produce a rotary motion of said rotor assembly.
Claim 3
Dependent Claim
37 words
A self-starting, brushless direct current motor according to claim 1 wherein each of said C-shaped channel members partially surrounds each of said electromagnets, creating a substantially constant air gap between said C-shaped channel members and said electromagnets.
Claim 4
Dependent Claim
294 words
A self-starting, brushless direct current motor comprising: a stator assembly; a rotor assembly which is rotatingly disposed within said stator assembly, said rotor assembly comprising a shaft, a slotted disk member, said disk member being connected to a first end of said shaft, and a pair of C-shaped channel members, said channel members being connected to a second end of said shaft; said stator assembly comprising a circular ring member and a plurality of electromagnets positioned circumferentially around said circular ring member, each of said electromagnets being powered by a direct current source; each of said C-shaped channel members partially surrounding each of said electromagnets, creating a substantially constant air gap between said C-shaped channel members and said electromagnets; and triggering means for energizing and deenergizing each of said electromagnets in a predetermined sequence to produce a rotary motion of said rotor assembly, said triggering means comprising: said slotted disk member; a first circuit board; and a second circuit board; said first circuit board comprising a plurality of infrared light emitting diodes; said second circuit board comprising a plurality of infrared phototransistors for receiving infrared signals from said light emitting diodes; and said slotted disk member being positioned between said first and second circuit boards for selectively passing said infrared signals from said light emitting diodes to said phototransistors; each of said infrared light emitting diodes being positioned opposite one of said phototransistors, forming a diode/phototransistor pair, said diode/phototransistor pairs being arranged in a circular fashion; each of said phototransistors, when activated, energizing one of said electromagnets; said slotted disk member comprising a pair of slots, disposed at substantially a 180 degree angle with respect to one another, said pair of slots passing said infrared signals from said light emitting diodes to said phototransistors.
Claim 5
Dependent Claim
294 words
A self-starting, brushless direct current motor comprising: a stator assembly; a rotor assembly which is rotatingly disposed within said stator assembly, said rotor assembly comprising a shaft, a slotted disk member, said disk member being connected to a first end of said shaft, and a pair of C-shaped channel members, said channel members being connected to a second end of said shaft; said stator assembly comprising a circular ring member and a plurality of electromagnets positioned circumferentially around said circular ring member, each of said electromagnets being powered by a direct current source; each of said C-shaped channel members partially surrounding each of said electromagnets, creating a substantially constant air gap between said C-shaped channel members and said electromagnets; and triggering means for energizing and deenergizing each of said electromagnets in a predetermined sequence to produce a rotary motion of said rotor assembly, said triggering means comprising: said slotted disk member; a first circuit board; and a second circuit board; said first circuit board comprising a plurality of infrared light emitting diodes; said second circuit board comprising a plurality of infrared phototransistors for receiving infrared signals from said light emitting diodes; and said slotted disk member being positioned between said first and second circuit boards for selectively passing said infrared signals from said light emitting diodes to said phototransistors; each of said infrared light emitting diodes being positioned opposite one of said phototransistors, forming a diode/phototransistor pair, said diode/phototransistor pairs being arranged in a circular fashion; each of said phototransistors, when activated, energizing one of said electromagnets; said slotted disk member comprising a pair of slots, disposed at substantially a 180 degree angle with respect to one another, said pair of slots passing said infrared signals from said light emitting diodes to said phototransistors.
Claim 6
Independent Claim
180 words
A method for controlling energization of the electromagnets of a motor, the motor having a stator assembly and a rotor assembly, wherein a plurality of electromagnets are circumferentially mounted around the stator assembly, with said plurality of electromagnets each having a pair of magnetic poles, wherein a pair of C-shaped steel pieces are mounted on one end of the rotor assembly, the pair of C-shaped pieces partially and periodically surrounding each electromagnet during rotation thereof, comprising: energizing a first of the plurality of electromagnets, thereby creating a magnetic attractive force between said first electromagnet and one of the pair of C-shaped pieces of the rotor, causing the entire rotor to turn; deenergizing the first electromagnet as soon as one of the pair of C-shaped channels becomes aligned with the pair of magnetic poles of the first electromagnet; immediately energizing the next electromagnet in sequence, thereby attracting the rotor to the next electromagnet and continuing the attractive rotation of the rotor; and continuously repeating the above sequence so that one of the pair of C-shaped channels continuously follows an energized electromagnet.
Claim 7
Independent Claim
180 words
A method for controlling energization of the electromagnets of a motor, the motor having a stator assembly and a rotor assembly, wherein a plurality of electromagnets are circumferentially mounted around the stator assembly, with said plurality of electromagnets each having a pair of magnetic poles, wherein a pair of C-shaped steel pieces are mounted on one end of the rotor assembly, the pair of C-shaped pieces partially and periodically surrounding each electromagnet during rotation thereof, comprising: energizing a first of the plurality of electromagnets, thereby creating a magnetic attractive force between said first electromagnet and one of the pair of C-shaped pieces of the rotor, causing the entire rotor to turn; deenergizing the first electromagnet as soon as one of the pair of C-shaped channels becomes aligned with the pair of magnetic poles of the first electromagnet; immediately energizing the next electromagnet in sequence, thereby attracting the rotor to the next electromagnet and continuing the attractive rotation of the rotor; and continuously repeating the above sequence so that one of the pair of C-shaped channels continuously follows an energized electromagnet.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1999-01-01 | 1999-07-03 | 2000-01-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-01-01 | 2003-07-03 | 2004-01-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-01-01 | 2007-07-03 | 2008-01-02 | $7700.00 | Window Closed / Lapsed |