Control apparatus for A.C. elevator

Details Control apparatus for A.C. elevator Control apparatus for A.C. elevator

1984-04-26

1985-11-26

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, 307 66, 320 22, 320 44, 318376, 318800, B66B 500

Patent

active

045549990

ABSTRACT:
An apparatus for controlling an A.C. elevator comprising: A charging device, a discharging device, an inverter, current detecting means for detecting the current flowing between an A-C power supply and D-C batteries and through said charging and discharging devices, and a charging and discharging rate control circuit responsive to the output of said current detecting means for controlling the charging and discharging rates of said D-C batteries as the load conditions of the car of said elevator change so as to cause said charging and discharging of said batteries to be minimum so that the element of said batteries is not shortened.

REFERENCES:
patent: 3409815 (1968-11-01), Wright et al.
patent: 3585482 (1971-06-01), Zelina
patent: 3735234 (1973-05-01), Godard
patent: 3902573 (1975-09-01), Grove
patent: 3950689 (1976-04-01), Jamison
patent: 4246633 (1981-01-01), Borkovitz
patent: 4253054 (1981-02-01), Steigerwald
patent: 4316097 (1982-02-01), Reynolds
patent: 4340823 (1982-07-01), Miyazawa
patent: 4376471 (1983-03-01), Uchino et al.
patent: 4456097 (1984-06-01), Salihi
"Otis Unveils Variable Frequency Drive", Elevator World, Dec. 1982, pp. 63-66.

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