Elevator control system

Details Elevator control system Elevator control system

1984-05-01

1985-05-14

Shoop, William M.

Elevator, industrial lift truck, or stationary lift for vehicle

Stationary lift for roadway vehicle or required component...

Having specific drive means for support

307 64, B66B 500

Patent

active

045166650

ABSTRACT:
An elevator control system has a converter for converting an AC power from a normal power source to a DC power having a variable voltage, an inverter for inverting the DC power from the converter to an AC power having a variable voltage and a variable frequency, and an induction motor energized by the inverter to drive an electric motor. When a power failure occurs on the normal power source as sensed by a power failure sensor, the converter is connected to an emergency power source to be fully fired to generate a DC power higher in DC voltage than that due to the normal power source.

REFERENCES:
patent: 4316097 (1982-02-01), Reynolds
patent: 4376471 (1983-03-01), Uchino et al.
patent: 4456097 (1984-06-01), Salihi

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