Escalator passenger flow control

Details Escalator passenger flow control Escalator passenger flow control

1985-05-28

1986-12-23

Smith, Jr., David

Electricity: motive power systems

Induction motor systems

Primary circuit control

318806, 318807, 198330, H02P 540

Patent

active

046314679

ABSTRACT:
A variable-frequency, variable-voltage (VVVF) converter is interposed in the line between an AC source and an asynchronous escalator motor. Current to the motor is sensed to determine load in conjunction with a passenger detector and load simulating electronic system and the frequency and voltage of the converter are automatically adjusted in response thereto to control escalator speed. The system includes a converter to supply the asynchronous drive motor of the escalator with variable frequency and an appropriate control circuit for manual or automatic operation of the escalator at different speeds, which is equivalent to different motor frequencies.

REFERENCES:
patent: 3899725 (1975-08-01), Plunkett
patent: 4263542 (1981-04-01), Schulze et al.
patent: 4276500 (1981-06-01), Sumka et al.
Pamphlet, "Lenze Antriebstechnik", by Maschinenfabrik Stahlkontor Weser Lenze GmbH & Co.

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