US3617837A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pulse actuated motor control circuit
Assignee: Honeywell Inc
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Filing: 1970-10-06
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Granted: 1971-11-02
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Expires: 1990-10-06
Abstract
Abstract A motor control circuit includes a momentary contact closure which actuates a switching means to apply an AC signal to the motor field windings causing rotation of the motor armature. Means are also provided to detect a predetermined rotational movement of the armature and, upon attainment thereof, to apply a DC signal to the field windings and thereby arrest the armature rotation.
Inventors
- 👤 Francis J Beck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 02:48
CPC Classifications
D; D05; D05B; D05B69/00; D05B69/22
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
169 words
A system for controlling the operation of an AC motor, said motor including a field winding means and an armature, said system comprising: means for providing an AC signal for said field winding means to impart rotary motion to said armature in response thereto; means for providing a DC signal; first switching means for selectively and alternatively applying said AC signal and said DC signal to said field winding means; first control signal means for generating a first control signal; said first switching means being responsive to said first control signal to be conditioned thereby to apply said AC signal to said field winding means whereby to initiate said rotary motion of said armature; and actuating means coupled to said armature and responsive to a predetermined rotational movement of said armature for further conditioning said first switching means to apply said DC signal to said armature to arrest the rotary motion of said armature whereby said armature is rotated a predetermined amount for each of said first control signals.
Claim 2
Independent Claim
169 words
A system for controlling the operation of an AC motor, said motor including a field winding means and an armature, said system comprising: means for providing an AC signal for said field winding means to impart rotary motion to said armature in response thereto; means for providing a DC signal; first switching means for selectively and alternatively applying said AC signal and said DC signal to said field winding means; first control signal means for generating a first control signal; said first switching means being responsive to said first control signal to be conditioned thereby to apply said AC signal to said field winding means whereby to initiate said rotary motion of said armature; and actuating means coupled to said armature and responsive to a predetermined rotational movement of said armature for further conditioning said first switching means to apply said DC signal to said armature to arrest the rotary motion of said armature whereby said armature is rotated a predetermined amount for each of said first control signals.
Claim 3
Dependent Claim
176 words
The invention as set forth in claim 1, wherein said means for providing an AC signal includes first and second input terminals, said field winding means being connected between said fIrst input terminal and a first common junction, and wherein said first switching means includes: a first switching device responsive to said first control signal to pass a first current signal therethrough; a second switching device connected across said first switching device and responsive to said actuation means to pass a second current signal therethrough whereby to open-circuit said first switching device; a second control signal means connecting said first switching device and said second switching device to said second input terminal and responsive to said first and second current signals to provide a second control signal; a third switching device connected between said first common junction and said second input terminal, and across said means for providing a DC signal, said third switching device responsive to said second control signal for selectively applying said AC signal and said DC signal to said field winding means.
Claim 4
Dependent Claim
18 words
The invention as set forth in claim 2 wherein said second control signal means comprises a voltage divider.
Claim 5
Dependent Claim
40 words
The invention as set forth in claim 2 wherein said means for providing a DC signal includes rectifier means operative upon the opening of said third switching device to rectify said AC signal whereby effectively to provide said DC signal.
Claim 6
Dependent Claim
113 words
The invention as set forth in claim 2 wherein said first control signal means includes: a rectifier means connected to said first input terminal for providing a rectified AC signal; an electrical storage means connected between said rectifier means and said second input terminal for storing substantially the peak value of said rectified AC signal; a voltage divider means connecting the common point between said rectifier means and said electrical storage means to said second input terminal for providing a first control signal; and a momentary contact means connected between said voltage divider means and said first switching device and selectively operative to apply said first control signal to said first switching device.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-11-01 | 1975-05-03 | 1975-11-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-01 | 1979-05-03 | 1979-11-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-01 | 1983-05-03 | 1983-11-02 | $7700.00 | Window Closed / Lapsed |