Control apparatus for escalator

Details Control apparatus for escalator Control apparatus for escalator

1986-06-17

1988-05-31

Smith, Jr., David

Electricity: motive power systems

Induction motor systems

Primary circuit control

318798, 318806, 198330, H02P 540

Patent

active

047483946

ABSTRACT:
A control apparatus for an escalator wherein a low speed operation is performed in the absence of passengers at the escalator, and a high speed operation is performed in the presence of passengers at the escalator the alternating current of a three-phase A-C power source is converted by frequency conversion means into a three-phase alternating current of low frequency, with which an induction motor is energized to perform the low speed operation, so that the induction motor is rotated near a synchronous speed corresponding to the low frequency, to realize the low speed operation of high efficiency.
Moreover, when passengers have been detected, the frequency of the alternating current from the conversion means is gradually raised, and the conversion means is thereafter switched to the three-phase A-C power source upon detecting the synchronism of this alternating current with the alternating current of the three-phase A-C power source, so that smooth switching free from shocks becomes possible.

REFERENCES:
patent: 2106833 (1938-02-01), Eames
patent: 4232776 (1980-11-01), Dean
patent: 4249120 (1981-02-01), Earle
patent: 4483419 (1984-11-01), Salihi
patent: 4499973 (1985-02-01), Delbrenzi et al.
patent: 4516665 (1985-05-01), Watanabe
patent: 4631467 (1986-12-01), Herrmann et al.

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