Patent US3702431A successfully refreshed from Google Patents.
US3702431A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Condition responsive modulating motor control system
Assignee: Honeywell Inc
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Filing: 1971-12-03
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Granted: 1972-11-07
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Expires: 1991-12-03
Abstract
Abstract A condition responsive circuit, disclosed as including two temperature responsive elements, is adapted to be connected to a pair of identical amplifiers which are biased to different operating levels. The amplifiers each have outputs that are connected to different silicon controlled rectifiers that are in turn connected in an inverse parallel relationship. Each of the pair of amplifiers further includes a positive feedback circuit to its respective input, and a time delayed negative feedback circuit connected to its respective input. An electric motor is connected in series with an alternating current supply and a pair of silicon controlled rectifiers so that the motor can be controlled. The motor is of a type that operates in a first direction when energized by a full-wave alternating potential to load a resilient means, such as a spring. The resilient means or spring is capable of returning the motor and load in the opposite direction when energy is removed from the motor. The motor is capable of being stalled and maintained in any intermediate position by the application of unidirectional half-wave potential.
Inventors
- 👤 Balthasar Hubert Pinckaers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:37
CPC Classifications
G; G05; G05D; G05D23/00; G05D23/19; G05D23/20; G05D23/24; G05D23/1906; G05D23/1913; G05D23/1927; G05D23/193; G05D23/1931
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
269 words
A condition responsive control system adapted to control condition changing means by way of an electric motor that is operated in a forward direction upon application of full-wave alternating current thereby loading resilient means with said resilient means capable of returning the motor in a reverse direction to a starting position of the motor when electric power is removed from said motor, and with said motor further being capable of being stalled in any intermediate position by application of a unidirectional voltage applied to said motor, including: condition responsive means having an output voltage that varies in magnitude with variations in a condition sensed by said condition responsive means; a pair of amplifier means each having input and output means; said amplifier means each having a different operating level and having their input means connected to said condition responsive output voltage; said amplifiers means each further having positive feedback circuit means and time delayed negative feedback circuit means connected between said amplifier input and output means to provide an output from each amplifier means as a function of the magnitude of said condition responsive output voltage; a pair of unidirectional solid state switch means connected in inverse parallel relationship with said pair of switch means further connected in series with said electric motor and adapted to connect said motor to a source of alternating current voltage; and output circuit means connecting each of said amplifier output means to control one of said solid state switch means; said motor adapted to operate said condition changing means to which said condition responsive means is ultimately responsive to establish a controlled condition.
Claim 2
Dependent Claim
269 words
A condition responsive control system adapted to control condition changing means by way of an electric motor that is operated in a forward direction upon application of full-wave alternating current thereby loading resilient means with said resilient means capable of returning the motor in a reverse direction to a starting position of the motor when electric power is removed from said motor, and with said motor further being capable of being stalled in any intermediate position by application of a unidirectional voltage applied to said motor, including: condition responsive means having an output voltage that varies in magnitude with variations in a condition sensed by said condition responsive means; a pair of amplifier means each having input and output means; said amplifier means each having a different operating level and having their input means connected to said condition responsive output voltage; said amplifiers means each further having positive feedback circuit means and time delayed negative feedback circuit means connected between said amplifier input and output means to provide an output from each amplifier means as a function of the magnitude of said condition responsive output voltage; a pair of unidirectional solid state switch means connected in inverse parallel relationship with said pair of switch means further connected in series with said electric motor and adapted to connect said motor to a source of alternating current voltage; and output circuit means connecting each of said amplifier output means to control one of said solid state switch means; said motor adapted to operate said condition changing means to which said condition responsive means is ultimately responsive to establish a controlled condition.
Claim 3
Dependent Claim
33 words
A condition responsive contRol system as described in claim 1 wherein said condition responsive means is a temperature responsive means and includes bridge circuit means having temperature responsive resistance means to sense temperature.
Claim 4
Dependent Claim
28 words
A condition responsive control system as described in claim 2 wherein said temperature responsive resistance means includes two temperature responsive resistors responsive to temperatures in two different locations.
Claim 5
Dependent Claim
48 words
A condition responsive control system as described in claim 2 wherein said time delayed negative feedback circuit means includes a capacitor in each of said delayed negative feedback circuit means to establish a delayed negative feedback with respect to a positive feedback in said positive feedback circuit means.
Claim 6
Dependent Claim
26 words
A condition responsive control system as described in claim 4 wherein said pair of unidirectional solid state switch means are a pair of silicon controlled rectifiers.
Claim 7
Dependent Claim
44 words
A condition responsive control system as described in claim 5 wherein said temperature responsive resistance means includes two temperature responsive resistors responsive to temperatures in two different locations, and said resistors being of different values to establish different effects in said bridge circuit means.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-11-07 | 1976-05-08 | 1976-11-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-11-07 | 1980-05-08 | 1980-11-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-11-07 | 1984-05-08 | 1984-11-07 | $7700.00 | Window Closed / Lapsed |