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 00:41
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.
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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) | 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 |