Patent US3668494A successfully refreshed from Google Patents.
US3668494A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Constant displacement stopping control
Assignee: International Business Machines Corp
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Filing: 1970-06-22
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Granted: 1972-06-06
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Expires: 1990-06-22
Abstract
Abstract Stopping of a d-c servo motor is effected in two phases, during the first of which the velocity is brought to half its initial value after initiation by a stop signal. A reference single shot and a proportional single shot determine the timing of the second phase, these circuits acting together to generate a stopping waveform which traverses a constant displacement, independent of motor deceleration rate.
Inventors
- 👤 Gerald J Agin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 23:30
CPC Classifications
H; H02; H02P; H02P3/00; H02P3/06; H02P3/08; H02P3/10
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
200 words
In a stop control for a d-c motor having an armature energized by driver circuit means, bistable switch means connected to said driver circuit means operable to turn on said driver circuit means to provide reverse energization of said motor armature for stopping said motor, circuit means connected to said bistable switch means for effecting operation thereof a first time in response to a stop signal to start a first phase of a stop sequence, integrating means connected to said bistable switch means and said driver circuit means responsive to the value of armature current of said motor to render said bistable switch means inoperative and terminate said first phase to provide a first stop phase having a duration determined by the value of the armature current of said moTor during said first phase, and additional circuit means connected to said bistable switch means to render said bistable switch means operable a second time to start a second phase in the stop sequence, said integrating means operating to again render said bistable switch means inoperative and terminate said second phase and provide a second phase having a duration determined by the value of the armature current during said second phase.
Claim 2
Dependent Claim
200 words
In a stop control for a d-c motor having an armature energized by driver circuit means, bistable switch means connected to said driver circuit means operable to turn on said driver circuit means to provide reverse energization of said motor armature for stopping said motor, circuit means connected to said bistable switch means for effecting operation thereof a first time in response to a stop signal to start a first phase of a stop sequence, integrating means connected to said bistable switch means and said driver circuit means responsive to the value of armature current of said motor to render said bistable switch means inoperative and terminate said first phase to provide a first stop phase having a duration determined by the value of the armature current of said moTor during said first phase, and additional circuit means connected to said bistable switch means to render said bistable switch means operable a second time to start a second phase in the stop sequence, said integrating means operating to again render said bistable switch means inoperative and terminate said second phase and provide a second phase having a duration determined by the value of the armature current during said second phase.
Claim 3
Dependent Claim
65 words
The invention as defined in claim 1 characterized by said bistable switch means comprising a stop latch having set and reset operating conditions, and said additional circuit means comprising a reference single shot connected to respond to said stop signal and a proportional single shot connected to said reference single shot and to said stop latch to be activated by said stop latch being reset.
Claim 4
Dependent Claim
44 words
The invention as defined in claim 2 characterized by said reference single shot being connected to gate means with the off output of said stop latch to activate said proportional single shot to determine the duration of the inoperative time of said stop latch.
References Cited (Backward Citations)
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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) | 1975-06-06 | 1975-12-06 | 1976-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-06 | 1979-12-06 | 1980-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-06 | 1983-12-06 | 1984-06-06 | $7700.00 | Window Closed / Lapsed |