Emergency stop circuit for a direct current elevator drive

Details Emergency stop circuit for a direct current elevator drive Emergency stop circuit for a direct current elevator drive

1998-03-17

1999-10-19

Nappi, Robert E.

Elevator, industrial lift truck, or stationary lift for vehicle

Having specific load support drive-means or its control

Includes control for power source of drive-means

318381, 318375, 187288, B66B 128, H02P 312

Patent

active

059693037

ABSTRACT:
An emergency stop circuit for an elevator drive includes an emergency stop control (7) that selectively varies the current flowing in a field winding (4) of a direct current drive motor (M). During an emergency stop, the motor (M) operates as a generator and has an armature winding (1) loaded with a braking resistor (9) to apply a voltage, depending on the direction of movement of the elevator car, either by a first switch (10) and a second switch (11), or by a third switch (12) and a fourth switch (13). The switches (10, 11, 12, 13) are connected as an H-bridge between the windings (1, 4) and are controlled by the emergency stop control (7) depending on the deceleration required by the elevator car, for example by pulse operation depending based upon a preset deceleration value and a measured deceleration value from a deceleration sensor (14) mounted on the car.

REFERENCES:
patent: 3448364 (1969-06-01), Keiper
patent: 3656039 (1972-04-01), Konrad
patent: 4039914 (1977-08-01), Steigerwald et al.
patent: 4307793 (1981-12-01), Caputo
patent: 4386299 (1983-05-01), Pham
patent: 4426610 (1984-01-01), Kawada et al.
patent: 4672277 (1987-06-01), Makinen et al.
patent: 5285029 (1994-02-01), Araki
patent: 5332954 (1994-07-01), Lankin
patent: 5361022 (1994-11-01), Brown
patent: 5642023 (1997-06-01), Journey

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