Door control system using drive motor torque signals

Details Door control system using drive motor torque signals Door control system using drive motor torque signals

1991-02-07

1992-07-21

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

051315068

ABSTRACT:
A system for controlling operation of an elevator car door includes a torque command output device for outputting a torque command for controlling a car door driving motor on the basis of a difference between a speed command commanding the operating speed of the motor and the actual speed of operation of the motor, a door position detector for detecting the position of the car door in terms of the number of pulses in a pulse train produced by an encoder connected to the motor, and a memory for storing torque limit values as a function of the door position. The system also has a controller which reads the torque limit value corresponding to the car door position detected by the door position detector. The controller then compares the read torque limit value with a torque command output from the torque command output device and generates a reversing instruction to be given to the motor upon determining that the torque command is not smaller than the torque limit value. An obstruction of the door is sensed as a rise in the torque command so that the car door is reversed to ensure safety.

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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