Apparatus for controlling an elevator door using a drive motor s

Details Apparatus for controlling an elevator door using a drive motor s Apparatus for controlling an elevator door using a drive motor s

1990-11-19

1992-12-15

Pellinen, A. D.

Elevator, industrial lift truck, or stationary lift for vehicle

Stationary lift for roadway vehicle or required component...

Having specific drive means for support

B66B 1314

Patent

active

051708655

ABSTRACT:
An apparatus for controlling an elevator door comprises a motor which closes and opens the door of an elevator and applies to the door torque necessary for maintaining a closed state of the door, an inverter apparatus for controlling the driving of the motor, a polarity deciding device for deciding the polarity of a slip frequency signal output from the inverter apparatus, and a driving stop device for causing the inverter apparatus to stop the driving of the motor when the polarity deciding device detects the inversion of the polarity of the slip frequency signal during the time that a closed state of the door is maintained by the motor.

REFERENCES:
patent: 3814214 (1974-06-01), Booker, Jr.
patent: 4051419 (1977-09-01), Takahashi
patent: 4227137 (1980-10-01), Hartman
patent: 4300663 (1981-11-01), Hmelovsky et al.
patent: 4815567 (1989-03-01), Ikejima
patent: 4982816 (1991-01-01), Doi et al.

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