Mitsubishi Electric Corporation

Tomohiro Asamura

Eiichi Saito

Seiji Watanabe

Daiki Fukui

Daisuke Nakazawa

Takahide Hirai

Yusuke Chikada

There is provided a vibration suppression device of a rope-like body that can use a negative restoring force that amplifies a displacement of a rope-like body of an elevator to prevent the displacement from becoming unstable. A vibration suppression device () includes a first displacement measurement unit, a first displacement amplifier, and a control unit (). The first displacement measurement unit measures a displacement in a lateral direction of the rope-like body due to vibration about an equilibrium position () at a first position (P) in a longitudinal direction of the rope-like body. The first displacement amplifier applies, to the rope-like body, a negative restoring force that amplifies the displacement of the rope-like body. The control unit () causes the first displacement amplifier to apply a negative restoring force smaller than a positive restoring force, based on the displacement measured by the first displacement measurement unit.

Vibration suppression device for rope-like body of elevator

A vibration damping device for reducing vibration of an elevator rope includes a displacement amplifier arranged around a region from a first portion of the elevator rope drawn and a second portion of the elevator rope drawn from an opposite side of one or more sheaves in parallel with the first portion. The displacement amplifier is configured to amplify a displacement of each of the first portion and the second portion of the elevator rope. The device also includes a limiting member that controls displacement amplification performed by the displacement amplifier such that the displacement of the first portion or the second portion amplified by the displacement amplifier does not become greater than a first displacement, which is a displacement of the elevator rope by which the elevator rope is not allowed to return to an equilibrium position of the vibration.

Vibration damping device and elevator apparatus

An object of the present invention is to provide a vibration damping device including an instability preventing means, for efficiently suppressing amplification of vibration of a long structure, which is mechanically flexible, due to a resonance phenomenon. A vibration damping device () for reducing vibration of a long structure () includes a displacement amplifier () and limiting members (). The displacement amplifier () is arranged along a given position in the longitudinal direction of the structure (). The displacement amplifier () amplifies a displacement of the structure (). The limiting members () control displacement amplification performed by the displacement amplifier () such that the displacement of the structure () amplified by the displacement amplifier () does not become greater than a first displacement, the first displacement being a displacement of the structure () by which the structure () is not allowed to return to the equilibrium position of the vibration.

An object of the present invention is to provide a sway amount estimation system that can suppress a reduction in user convenience that would occur if the operation method is switched more than necessary. A sway amount estimation system () includes a sensing unit (), a judgment unit (), and an estimation unit (). The estimation unit () calculates an estimated value of the amount of sway of an elevator rope due to vibration caused by building sway based on the sway sensed by the sensing unit () and an estimation model incorporating the effect of the displacement amplification of the displacement amplifier (). The judgment unit () judges if the estimated value calculated by the estimation unit () is greater than a threshold for switching the operation method for the elevator apparatus ().

Sway amount estimation system and elevator apparatus

An object of the invention is to provide a vibration damping system that can avoid the occurrence of resonance of an elevator rope regardless of the vibration frequency of a vibration source. A vibration damping system () includes a displacement amplifier (), a calculation unit (), and a displacement amplification control unit (). The displacement amplifier () is arranged along a given position in the longitudinal direction of the elevator rope. The displacement amplifier () amplifies a displacement due to vibration of the elevator rope based on a variable amplification factor. The calculation unit () calculates the natural frequency of the elevator rope. The displacement amplification control unit () controls the displacement amplification of the displacement amplifier () based on the natural frequency calculated by the calculation unit () and a preset vibration frequency.

Vibration damping system and elevator apparatus

There is provided a vibration suppression device for a rope-like body of an elevator that can inhibit displacement of the rope-like body from becoming unstable due to amplification of the displacement and can make a movable range of the rope-like body wider. A vibration suppression device () includes a movable unit and a stopper. The movable unit can move in a direction in which a distance from an equilibrium position () of the rope-like body changes. The stopper restricts movement of the movable unit to a position closer than a first distance (d) from the equilibrium position (). The movable unit includes a displacement amplifier and a restriction member. The displacement amplifier is arranged to be directed to a first position (P) of the rope-like body. The displacement amplifier amplifies displacement of the rope-like body. The restriction member inhibits the rope-like body from approaching the displacement amplifier.

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Tokyo, Japan

Tomohiro Asamura