Patent ID: 7909141

Claim:
A vibration damping system for an elevator, comprising: a damping device that is provided between a cab and a car frame for supporting the cab and whose damping coefficient can be changed; a second damping device, which is mounted on the car frame and whose damping coefficient can be changed, for damping a vibration in which a guide roller that rotatably moves along a guide rail provided in a hoistway moves transversely; a speed detection means for detecting the traveling speed of a reference elevator car; a position detection means for detecting the position of the reference elevator car; a wind pressure anticipation means for anticipating a wind pressure to be exerted on the reference elevator car, by use of data on a fixed mutual-passing place, the speed detected by the speed detection means, and the position detected by the position detection means; and a calculation unit for receiving the output of the wind pressure anticipation means, calculating control signals for the damping device and the second damping device, and outputting the control signals to the damping device and the second damping device, the calculation unit controlling the damping device and the second damping device in such a way that, during duration in which the occurrence of a wind pressure is anticipated and predetermined durations immediately before and immediately after said duration, at least one of the respective damping coefficients of the damping device and the second damping device is rendered larger than that during duration other than said duration and the predetermined durations immediately before and immediately after said duration.