Escalator with controlled brake

Details Escalator with controlled brake Escalator with controlled brake

B - Operations, Transporting

65

G

341/48

B65G 43/00 (2006.01) B66B 25/00 (2006.01)

Patent

CA 1233894

ABSTRACT OF THE DISCLOSURE 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 linearally. 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.

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