Magnetic brake system and elevator trouble detection system
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United States of America Patent
Stats
-
Jun 1, 2004
Grant Date -
Jun 19, 2003
app pub date -
Dec 10, 2002
filing date -
Dec 11, 2001
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
To accurately detect a trouble of a magnetic brake (2) by eliminating any effect of a temperature of a location at which an elevator is installed, a temperature sensor (3) is arranged to measure a temperature of the magnetic brake (2). When an armature (2c) has been attracted responsive to a brake release command, the temperature of the magnetic brake is measured as a first temperature, and before the armature returns responsive to a brake actuation command, the temperature of the magnetic brake is measured as a second temperature. The first and second temperatures are compared with each other. When a result of the comparison between the first and second temperatures is determined to be greater than a predetermined value, the magnetic brake (2) is determined to have been locked and hence, to have developed a trouble.
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