| 摘要 |
An elevator has a car traveling along guide rails within a hoistway and a main drive propelling the car. A sensor mounted on the car measures a vertical travel parameter of the car, a comparator compares the sensed car travel parameter with a reference value derived from the main drive, and an auxiliary motor mounted on the car exerts a vertical force on at least one of the guide rails in response to an error signal output from the comparator.
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