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Jerk limiting in elevator rescue system

  • US 10,273,116 B2
  • Filed: 02/24/2016
  • Issued: 04/30/2019
  • Est. Priority Date: 03/23/2015
  • Status: Active Grant
First Claim
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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:

  • 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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