| 摘要 |
The present invention provides an elevator comprising a car (1) arranged to travel along guide rails (6) within a hoistway (8) and a main drive (52,54,56,DMC) to propel the car (1). A sensor (30;40) is mounted on the car (1) to measure a vertical travel parameter (Vc;Ac) of the car (1), a comparator (32) compares the sensed car travel parameter (Vc;Ac) with a reference value (Vr;Ar) derived from the main drive (52,54,56,DMC), and an auxiliary motor (24) is mounted on the car (1) to exert a vertical force (F) on at lea st one of the guide rails (6) in response to an error signal (Ve;Ae) output from the comparator (32).
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