Elevator – industrial lift truck – or stationary lift for vehicle – Stationary lift for roadway vehicle or required component... – Having specific drive means for support
Patent
1981-07-31
1984-04-10
Roskoski, Bernard
Elevator, industrial lift truck, or stationary lift for vehicle
Stationary lift for roadway vehicle or required component...
Having specific drive means for support
B66B 128
Patent
active
044415842
ABSTRACT:
In an AC elevator system employing a three-phase induction motor for driving an elevator car, the primary voltage supplied to the induction motor is controlled to control the motoring torque in the acceleration mode and in the rated-speed running mode, while, in the deceleration mode, a power converter unit supplies AC power of low frequency to the induction motor to apply regenerative braking.
REFERENCES:
patent: 3667016 (1972-05-01), Dunfield et al.
patent: 3710218 (1973-01-01), Roundy et al.
patent: 4227138 (1980-10-01), Espelage et al.
patent: 4292577 (1981-09-01), Cesarz et al.
patent: 4319665 (1982-03-01), Komuro et al.
Hatakeyama Takanobu
Komuro Katsu
Kurihara Tomiaki
Maeda Yasuyuki
Mitsui Nobuo
Duncanson Jr. W. E.
Hitachi , Ltd.
Roskoski Bernard
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