AC Elevator control system

Details AC Elevator control system AC Elevator control system

1975-03-04

1977-08-16

Rubinson, Gene Z.

Elevator, industrial lift truck, or stationary lift for vehicle

Stationary lift for roadway vehicle or required component...

Having specific drive means for support

B66B 132

Patent

active

040420698

ABSTRACT:
In an AC elevator which is provided with a multi-speed induction motor unit connected to an AC power source and including a high-speed motor and a low-speed motor and in which an elevator car is started and accelerated by the high-speed motor, a control system comprising regenerative braking means connecting the low-speed motor to the AC power source through one set of thyristors connected in parallel in opposite polarity, DC braking means for supplying direct current to the high-speed motor from a controlled reactifier circuit, means for controlling the regenerative braking means to reduce the speed of the elevator car, means for detecting the reduction of the speed of the elevator car to a level at which the regenerative braking means is no more effective in producing the regenerative braking torque, and means for deenergizing the regenerative braking means and energizing the DC braking means in response to the output of the detecting means.

REFERENCES:
patent: 2103805 (1937-12-01), Williams
patent: 2828832 (1958-04-01), Spiess et al.
patent: 3319142 (1967-05-01), Grepe
patent: 3687235 (1972-08-01), Mitsui et al.
patent: 3860093 (1975-01-01), Mitsui et al.

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