Escalator with controlled brake

Details Escalator with controlled brake Escalator with controlled brake

1984-08-27

1986-05-13

Valenza, Joseph E.

Conveyors: power-driven

Conveyor or accessory therefor specialized to convey people

With means to control the operation of the section

198855, 192 9, 188181C, B65G 4300

Patent

active

045880654

ABSTRACT:
An escalator having improved brake control, to limit the rate of deceleration immediately following a stop command, and to quickly cause the actual speed of the escalator to closely follow a linearly declining speed ramp of a speed pattern signal. The signal controlling the brake is pulse duration modulated such that the brake responds to the average pulse duration, and braking torque is applied gradually and essentially linearly. The reference speed pattern has a substantially constant portion and a declining ramp portion. To limit the initial deceleration, the constant portion of the speed pattern is controlled to be a function of the actual speed signal, and the declining ramp portion of the reference signal is controlled to start when the actual speed is equal to the constant portion of the reference speed signal.

REFERENCES:
patent: 4231452 (1980-11-01), Kraft

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