Elevator safety device

Details Elevator safety device Elevator safety device

1977-07-25

1979-01-09

Schaefer, Robert K.

Elevator, industrial lift truck, or stationary lift for vehicle

Stationary lift for roadway vehicle or required component...

Having specific drive means for support

318368, B66B 502

Patent

active

041334132

ABSTRACT:
An armature of an electric motor for an elevator car is controllably driven by a three-phase source through a semiconductor converter controlled with a difference between a command and an actual car speed signal. A relay for sensing a ripple current from the converter is serially connected to a tuned filter across the armature. When a break occurs anywhere in a circuit with the motor armature, the sensor relay is deenergized and connects an emergency braking circuit across the armature. Alternatively the sensor relay may be connected via the filter to a reactor connected to the converter.

REFERENCES:
patent: 3470438 (1969-09-01), Krauer et al.
patent: 4027225 (1977-05-01), Eluin
patent: 4030570 (1977-06-01), Caputo

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