| CPC B66B 5/02 (2013.01) [B66B 7/1215 (2013.01); B66B 1/32 (2013.01)] | 14 Claims |
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1. A break detection device comprising:
a sensor of which an output signal varies when vibration occurs in a rope of an elevator; and
processing circuitry configured
to extract, from the output signal from the sensor, a vibration component in a specific frequency band;
to attenuate, from the extracted vibration component using low-pass filters, a steady vibration component and a progressively increasing vibration component to extract a determination signal;
to detect, on the basis of the extracted determination signal, occurrence of an abnormal variation in the output signal from the sensor; and
to determine, when the occurrence of the abnormal variation is detected, whether or not the rope has a broken portion on the basis of a position of a car of the elevator at an occurrence time of the abnormal variation, wherein
a section in which the car moves is imaginarily divided into a plurality of vertically consecutive unit sections, and
the determination signal is extracted so as to correspond to each of the unit sections with each of the low-pass filters corresponding to a different one of the unit sections.
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