Apparatus for controlling an A-C power elevator

Details Apparatus for controlling an A-C power elevator Apparatus for controlling an A-C power elevator

1983-03-01

1985-10-08

Shoop, Jr., 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

187 29A, 318762, 318802, 318807, 318810, 363 37, 363 55, 363 61, B66B 500

Patent

active

045454647

ABSTRACT:
An apparatus for controlling an A-C powered elevator in which A-C electric power is converted into D-C electric power through a rectifier, the D-C electric power thus converted is converted into a A-C electric power of a variable frequency via an inverter, an A-C electric motor is driven by the thus converted A-C electric power, the A-C motor being controlled by a controller which is connected to a D-C control source, a cage is driven by the thus controlled electric motor, said motor producing regenerated electric power depending upon the operation condition of said cage, wherein provision is made of a regenerated electric power controlling device which is connected between the D-C side of the inverter and the controller in order to supply the regenerated electric power to the controller. When the voltage on the D-C side of the inverter becomes greater than a predetermined reference value, a switching element is rendered conductive, and the regenerated electric power is supplied to the controller. Therefore, a power regenerating inverter need not be independently provided, and the apparatus can be cheaply constructed. Further, since the electric power is not wastefully consumed, energy can be saved.

REFERENCES:
patent: 4319177 (1982-03-01), Kawada et al.
patent: 4353023 (1982-10-01), Kawada et al.
patent: 4426610 (1984-01-01), Kawada et al.
patent: 4434393 (1984-02-01), Kobari et al.

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