Hitachi, Ltd.

Toshiro Narita

Seiya Shima

Kenji Yoneda

Yasunori Katayama

Sadao Hokari

Takanobu Hatakeyama

Kazuhiro Sakata

Tomiaki Kurihara

Toshio Meguro

A pulse generator is coupled to a car drive motor directly coupled to a sheave, over which a rope suspending an elevator car is passed, and the position of the car is calculated through the counting of pulses produced from the pulse generator. First and second car position detectors for detecting respective first and second car positions are provided within a hatchway, and the number of pulses produced during a period from the actuation of the first car position detector till the actuation of the second car position detector is detected. A count value for calculating the car position is corrected according to the difference between the detected pulse number and a reference pulse number corresponding to the distance between the first and second car position detectors, thereby effecting the compensation for the wear of the sheave and rope to improve the precision of the car position detection.

Method and apparatus for detecting elevator car position

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Hitachi, Japan

Toshiro Narita