US3552524A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Speed dictation apparatus for elevator motor control system
Assignee: Otis Elevator Co
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Filing: 1969-02-03
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Granted: 1971-01-05
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Expires: 1989-02-03
Abstract
Abstract Speed dictation apparatus for a high-speed elevator motor control system which generates a time-controlled speed dictation signal to control the speed of the car in a predetermined manner so that it is accelerated at the same predetermined rate for any length of trip. A distance-controlled speed dictation signal is also generated. This is operable to control the speed of the car during its deceleration in a predetermined manner as a function of its distance from a selected landing at which it is to stop. The car is decelerated in substantially the same predetermined manner as it would be by the distance-controlled signal notwithstanding the continued generation of the time-controlled signal which would otherwise cause the motor to control the speed of the car in a different manner.
Inventors
- 👤 Sidney Howard Benjamin
- 👤 Otto Albert Krauer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 05:08
CPC Classifications
B; B66; B66B; B66B1/00; B66B1/34; B66B1/46; B66B1/52
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
345 words
In a system for controlling the speed of travel of a highspeed elevator car in which the car starts on any trip by accelerating in response to a signal to start and completes each trip by decelerating to a stop at a selected one of a plurality of landings in response to a signal to stop thereat, apparatus comprising: time-controlled speed dictation signal-generating means operating in response to the reception of each signal to start and on each individual trip generating a time-controlled speed dictation signal which is operable to control the speed of the car in a predetermined manner so that said car is accelerated at the same predetermined rate regardless of the length of the trip; a landing selector mechanism operating during each individual trip of said car in response to the reception of the signal to start on that trip and the signal to stop the trip at a selected landing and generating a distance-controlled speed dictation siGnal operable to control the speed of said car in a predetermined manner during its deceleration as a function of the distance of said car from said selected landing; speed regulating equipment connected to said time-controlled speed dictation signal-generating means and to said landing selector mechanism and during each trip generating an output signal in response to said time-controlled and said distancecontrolled speed dictation signals; a hoisting motor driving said elevator car; and motor control equipment connected to said speed-regulating equipment to receive its output signal and in accordance therewith control the speed of rotation of said hoisting motor and thereby control the speed of said car, said speedregulating equipment operating in response to the reception of a signal to stop at a selected landing and generating an output signal which controls the speed of the car during deceleration in substantially the same predetermined manner as said distance-controlled speed dictation signal would notwithstanding the continued reception of the time-controlled speed dictation signal from said time-controlled signalgenerating means which would otherwise cause said speedregulating equipment to control the speed of said car in a different manner.
Claim 2
Dependent Claim
345 words
In a system for controlling the speed of travel of a highspeed elevator car in which the car starts on any trip by accelerating in response to a signal to start and completes each trip by decelerating to a stop at a selected one of a plurality of landings in response to a signal to stop thereat, apparatus comprising: time-controlled speed dictation signal-generating means operating in response to the reception of each signal to start and on each individual trip generating a time-controlled speed dictation signal which is operable to control the speed of the car in a predetermined manner so that said car is accelerated at the same predetermined rate regardless of the length of the trip; a landing selector mechanism operating during each individual trip of said car in response to the reception of the signal to start on that trip and the signal to stop the trip at a selected landing and generating a distance-controlled speed dictation siGnal operable to control the speed of said car in a predetermined manner during its deceleration as a function of the distance of said car from said selected landing; speed regulating equipment connected to said time-controlled speed dictation signal-generating means and to said landing selector mechanism and during each trip generating an output signal in response to said time-controlled and said distancecontrolled speed dictation signals; a hoisting motor driving said elevator car; and motor control equipment connected to said speed-regulating equipment to receive its output signal and in accordance therewith control the speed of rotation of said hoisting motor and thereby control the speed of said car, said speedregulating equipment operating in response to the reception of a signal to stop at a selected landing and generating an output signal which controls the speed of the car during deceleration in substantially the same predetermined manner as said distance-controlled speed dictation signal would notwithstanding the continued reception of the time-controlled speed dictation signal from said time-controlled signalgenerating means which would otherwise cause said speedregulating equipment to control the speed of said car in a different manner.
Claim 3
Dependent Claim
121 words
In a system according to claim 1, wherein said time-controlled speed dictation signal-generating means includes an acceleration signal function generator operating in response to the reception of each signal to start and on each individual trip generating a time-controlled acceleration dictation signal which regardless of the length of said trip is operable to accelerate said car at the same predetermined rate as a function of time and a deceleration signal function generator operating in response to the reception of a signal to stop at a selected landing during each individual trip of the car and generating a time-controlled speed dictation signal operable to control the speed of said car during its deceleration in a predetermined manner as a function of time.
Claim 4
Dependent Claim
153 words
In a system according to claim 2, wherein said speed-regulating equipment includes both an output voltage generator and output voltage control equipment; said output voltage control equipment being connected to said landing selector mechanism to receive its distance-controlled speed dictation signal and in response to the reception of a signal to stop at a selected landing generating a voltage proportional to the difference between said distance-controlled speed dictation signal and the output signal of said speed-regulating equipment; and said output voltage generator during the deceleration of said car receiving the time-controlled dictation signal from said deceleration signal function generator and the proportional difference voltage from said output voltage control equipment and generating in accordance therewith as the output signal of said speed-regulating equipment an output voltage whereby the difference between the output signal of said speed-regulating equipment and said distance-controlled speed dictation signal is continuously reduced until the former conforms to the latter.
Claim 5
Dependent Claim
56 words
In a system according to claim 3, wherein said acceleration signal function generator is connected to said output voltage generator in response to the reception of a signal to start and disconnected therefrom in response to the reception of a signal to stop whereupon said deceleration signal function generator is connected to said output voltage generator.
Claim 6
Dependent Claim
44 words
In a system according to claim 4, wherein said time-controlled signal-generating means includes a capacitive circuit and during each trip of said car said acceleration and deceleration signal function generators generate voltages of opposite polarities which produce predetermined voltage charges across said capacitive circuit.
Claim 7
Dependent Claim
98 words
In a system according to claim 5, wherein said output voltage generator includes an integrating amplifier having an input circuit and an output circuit, saId inpUt circuit being connected to said capacitive circuit to receive being connected to said motor control equipment, said integrating amplifier integrating the voltage received by said input circuit and producing an output speed-determining voltage at its output circuit from which it is received by said motor control equipment, said output voltage generator including voltage output clamping circuits for clamping the output speed-determining voltage of said integrating amplifier at predetermined minimum and maximum magnitudes.
Claim 8
Dependent Claim
31 words
In a system according to claim 6, wherein the distance-controlled speed dictation signal generated by said landing selector mechanism is a voltage suitable for direct application to said motor control equipment.
Claim 9
Dependent Claim
148 words
In a system according to claim 7, wherein said output voltage control equipment includes an inverting amplifier, a summation amplifier and decelerating switching means, said inverting amplifier receiving and inverting the output speed-determining voltage of said integrating amplifier, said summation amplifier algebraically summing the magnitudes of said landing selector mechanism voltage and the voltage produced by said inverting amplifier, and said decelerating switching means connecting said summation amplifier to the input circuit of said integrating amplifier during each trip of said car in response to the reception of a signal to stop at a selected landing whereby the input voltage thereafter applied to said integrating amplifier comprises the algebraic sum of the voltage across said capacitive circuit resulting from the voltage generated by said deceleration signal function generator and the difference between said landing selector mechanism voltage and the output speed determining voltage produced by said integrating amplifier.
Claim 10
Dependent Claim
72 words
In a system according to claim 8, wherein said output voltage control equipment includes stopping switching means responsive during each trip of said car to the approach of the car within a predetermined distance of the selected landing at which a stop is to be made disconnecting said motor control equipment from the output circuit of said integrating amplifier and connecting it to receive the voltage generated by said landing selector mechanism.
References Cited (Backward Citations)
US3350612A
Cited
US3435916A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-01-04 | 1974-07-06 | 1975-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-04 | 1978-07-06 | 1979-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-04 | 1982-07-06 | 1983-01-05 | $7700.00 | Window Closed / Lapsed |