Jerk limiting in elevator rescue system
First Claim
1. A rescue system for moving an elevator car of an elevator in an emergency situation, which elevator includes an elevator motor acting on hoisting ropes by which the elevator car is suspended and/or moved, which elevator motor comprises at least one electro-mechanical brake and an encoder outputting a signal corresponding to its speed, which system comprises:
- a back-up power source,a jerk monitoring circuit connected to the encoder and comprising a memory for at least one first upper threshold value for the time derivative of the car acceleration,a brake feed circuit which is controlled by the jerk monitoring circuit,at least one release switch which is connected to the jerk monitoring circuit and/or to the brake feed circuit,wherein the operation of the release switch activates the brake feed circuit to release the brake, and initiates the jerk monitoring circuitthe jerk monitoring circuit comparing the derivative of the car acceleration derived from the encoder signal with the stored first upper threshold value so that when the derivative of acceleration exceeds the threshold the jerk monitoring circuit supplies, a control signal to the brake feed circuit to initiate/stop braking depending on the comparison result.
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Accused Products
Abstract
An elevator rescue system allows an elevator car of an elevator to be moved in an emergency situation. The elevator includes an elevator motor acting on hoisting ropes by which the elevator car is suspended including at least one electro-mechanical brake and an encoder outputting a signal corresponding to its speed. The rescue system includes a back-up power source, a jerk monitoring circuit connected to the encoder and including a memory storing an upper threshold value for the derivative of car acceleration, a brake feed circuit controlled by the jerk monitoring circuit, and a release switch connected to the jerk monitoring circuit and/or to the brake feed circuit. The release switch activates the brake feed circuit to release the brake, and initiate the jerk monitoring circuit to compare the derivative of car acceleration derived from the encoder signal with the stored first upper threshold value, and forwards a control signal to the brake feed circuit to initiate/stop braking depending on the comparison result.
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Citations
19 Claims
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1. A rescue system for moving an elevator car of an elevator in an emergency situation, which elevator includes an elevator motor acting on hoisting ropes by which the elevator car is suspended and/or moved, which elevator motor comprises at least one electro-mechanical brake and an encoder outputting a signal corresponding to its speed, which system comprises:
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a back-up power source, a jerk monitoring circuit connected to the encoder and comprising a memory for at least one first upper threshold value for the time derivative of the car acceleration, a brake feed circuit which is controlled by the jerk monitoring circuit, at least one release switch which is connected to the jerk monitoring circuit and/or to the brake feed circuit, wherein the operation of the release switch activates the brake feed circuit to release the brake, and initiates the jerk monitoring circuit the jerk monitoring circuit comparing the derivative of the car acceleration derived from the encoder signal with the stored first upper threshold value so that when the derivative of acceleration exceeds the threshold the jerk monitoring circuit supplies, a control signal to the brake feed circuit to initiate/stop braking depending on the comparison result. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method of moving an elevator car of an elevator in an emergency situation, which elevator includes an elevator motor acting on hoisting ropes by which the elevator car is suspended and/or moved, which elevator motor comprises at least one electro-mechanical brake and an encoder outputting a signal corresponding to its speed, using
a back-up power source, a brake feed circuit to operate the electro-mechanical brake, at least one release switch to initiate a rescue operation, the method comprising: -
releasing the brake in response to actuation of the release switch to move the elevator car in the direction of a floor, and monitoring acceleration of the elevator car and activating the brake when the derivative of acceleration exceeds an upper threshold value. - View Dependent Claims (15, 16, 17, 18, 19)
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Specification