Elevator system

Details Elevator system Elevator system

1984-09-11

1986-04-15

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

318257, B66B 130

Patent

active

045821747

ABSTRACT:
A traction elevator system having an elevator car driven by a dual converter bank, solid state motor drive. The solid state motor drive includes bank selection circuits, which select the operative converter bank at any instant, and firing circuits for providing firing pulses for the selected converter bank. The energization and deenergization of the bank selection circuits and firing circuits are controlled such that the bank selection circuits are energized before the firing circuits, and, upon loss of power, the bank selection circuits are deenergized after the firing circuits.

REFERENCES:
patent: 3713011 (1973-01-01), Johnson et al.
patent: 4155427 (1979-05-01), Caputo et al.
patent: 4277825 (1981-07-01), Johnson
patent: 4286222 (1981-08-01), Caputo
patent: 4286315 (1981-08-01), Johnson
patent: 4307793 (1981-12-01), Caputo
patent: 4416352 (1983-11-01), Husson et al.
patent: 4416352 (1983-11-01), Husson et al.

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