Patent US601082A successfully refreshed from Google Patents.
Patent US4780652A successfully refreshed from Google Patents.
US4780652A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Circuit for controlling a brushless electric motor
Assignee: Deutsche Thomson Brandt GmbH
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Filing: 1986-02-15
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Granted: 1988-10-25
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Expires: 2006-02-15
Abstract
Abstract A control circuit for controlling a brushless motor for a washing machine comprises AC main voltage, a phase-trimming circuit for trimming the AC main voltage and supplying the trimmed AC main voltage to the stator windings of the brushless motor, depending on a control voltage derived from a rotor position sensor of the brushless motor. The phase-trimming circuit changes the polarity of the trimmed AC main voltage so that a first polarity is supplied to a first stator winding and a second polarity is supplied to a second stator winding of the brushless motor.
Inventors
- 👤 Gerard Rilly
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:58
CPC Classifications
H; H02; H02K; H02K29/00; H02K29/06; H02P; H02P6/00; H02P6/08; H02P6/24
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
169 words
A circuit for controlling a slow-running brushless electric motor for washing machine, comprising: a permanent magnet rotor and stator winding in said motor; a rotor position sensor; a main voltage supply for supplying AC main voltage; a phase-trimming circuit for trimming said AC main voltage and supplying the trimmed AC main voltage to said stator winding by a control voltage derived from the rotor position sensor for controlling the supply of said trimmed AC main voltage to said stator winding; said phase-trimming circuit changing the polarity of said trimmed AC main voltage supplied to said stator winding after a number of periods of said trimmed AC main voltage; said stator winding having subdivided a first subsidiary winding and a second subsidiary winding being of opposite polarity, said trimmed AC main voltage of a first polarlity from said main voltage supply being appled to said first subsidiary winding, and said trimmed AC main voltage of a second polarity opposite to said first polarity being applied to said second subsidiary winding.
Claim 2
Dependent Claim
169 words
A circuit for controlling a slow-running brushless electric motor for washing machine, comprising: a permanent magnet rotor and stator winding in said motor; a rotor position sensor; a main voltage supply for supplying AC main voltage; a phase-trimming circuit for trimming said AC main voltage and supplying the trimmed AC main voltage to said stator winding by a control voltage derived from the rotor position sensor for controlling the supply of said trimmed AC main voltage to said stator winding; said phase-trimming circuit changing the polarity of said trimmed AC main voltage supplied to said stator winding after a number of periods of said trimmed AC main voltage; said stator winding having subdivided a first subsidiary winding and a second subsidiary winding being of opposite polarity, said trimmed AC main voltage of a first polarlity from said main voltage supply being appled to said first subsidiary winding, and said trimmed AC main voltage of a second polarity opposite to said first polarity being applied to said second subsidiary winding.
Claim 3
Dependent Claim
14 words
A circuit as defined in claim 1, wherein said two subsidiary windings are identical.
Claim 4
Dependent Claim
16 words
A circuit as defined in claim 1, wherein said phase-trimming circuit comprises at least a triac.
Claim 5
Dependent Claim
23 words
A circuit as defined in claim 3, wherein said at least a triac is connected in series with one of said subsidiary windings.
Claim 6
Dependent Claim
18 words
A circuit as defined in claim 3, wherein one triac is connected in series with each subsidiary winding.
Claim 7
Dependent Claim
19 words
A circuit as defined in claim 1, wherein said first and second subsidiary winding are of magnetically opposite polarity.
References Cited (Backward Citations)
US3333171A
Cited
US3466519A
Cited
US3529220A
Cited
US3959709A
Cited
US4238719A
Cited
JPS56121377A
Cited
US4431958A
Cited
JPS60176473A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-10-25 | 1992-04-25 | 1992-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-10-25 | 1996-04-25 | 1996-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-10-25 | 2000-04-25 | 2000-10-25 | $7700.00 | Window Closed / Lapsed |