Elevator system
First Claim
Patent Images
1. An elevator system, comprising:
- a structure,an elevator car mounted for movement in said structure,motive means including motor means for effecting movement of said elevator car,control means for operating said motive means, including means providing a speed pattern signal having a magnitude responsive to the desired speed of the elevator car,means providing a first speed signal having a magnitude responsive to said motor means,means responsive to said speed pattern signal for providing a response signal indicative of the expected response of the elevator car to the speed pattern signal,comparator means comparing said first speed signal and said response signal, said comparator means providing a predetermined output signal when the compared signals differ by a predetermined magnitude,and modifying means for modifying the operation of the elevator car in response to the comparator means providing said predetermined output signal when the elevator car is moving.
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Abstract
An elevator system including an elevator car and counterweight mounted for movement in a structure by a traction drive arrangement which includes a drive sheave and a drive motor. A first tachometer provides signals responsive to the drive motor and a second tachometer provides signals responsive to movement of the elevator car. The signals from the first and second tachometers are used in both functional and monitoring circuits to control the operation of the elevator system in a highly efficient self-checking manner.
25 Citations
31 Claims
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1. An elevator system, comprising:
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a structure, an elevator car mounted for movement in said structure, motive means including motor means for effecting movement of said elevator car, control means for operating said motive means, including means providing a speed pattern signal having a magnitude responsive to the desired speed of the elevator car, means providing a first speed signal having a magnitude responsive to said motor means, means responsive to said speed pattern signal for providing a response signal indicative of the expected response of the elevator car to the speed pattern signal, comparator means comparing said first speed signal and said response signal, said comparator means providing a predetermined output signal when the compared signals differ by a predetermined magnitude, and modifying means for modifying the operation of the elevator car in response to the comparator means providing said predetermined output signal when the elevator car is moving. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. An elevator system, comprising:
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a structure, an elevator car mounted for movement in said structure, motive means including motor means for effecting movement of said elevator car, first speed indicating means providing a first speed signal having a magnitude responsive to said motor means, second speed indicating means providing a second speed signal having a magnitude responsive to the movement of said elevator car, first comparator means comparing said first and second speed signals and providing a first output signal when the compared signals differ by a predetermined magnitude, and modifying means for modifying the operation of said elevator car in response to the first comparator means providing said first output signal when the elevator car is moving. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30)
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31. An elevator system, comprising:
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a structure, an elevator car mounted for movement in said structure, motive means for effecting movement of said elevator car, control means for operating said motive means, including means providing a speed pattern signal having a magnitude responsive to the desired speed of the elevator card, means responsive to said speed pattern signal for providing a response signal indicative of the expected response of the elevator car to the speed pattern signal, means providing a first signal indicative of the actual response of the elevator car to the speed pattern signal, comparator means comprising said first signal and said response signal, said comparator means providing a predetermined signal when the compared signals differ by a predetermined magnitude, and mofifying means for modifying the operation of the elevator car in response to the comparator means providing said predetermined signal.
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Specification