Elevator control system
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United States of America Patent
Stats
-
Jul 22, 1980
Grant Date -
N/A
app pub date -
Jul 6, 1978
filing date -
Jul 6, 1978
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An elevator control system includes a power source which supplies AC power to an induction motor for driving an elevator car through a first thyristor gate circuit. Another induction motor provided for braking the elevator car is connected to the power source through a second thyristor gate circuit. A tachometer generator connected to the induction motors produces an speed signal indicative of the speed of the elevator car. The speed signal is compared with a reference signal and the difference therebetween is used to control the first and second thyristor gate circuits for controlling the elevator car speed.
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