AC elevator speed control system

Details AC elevator speed control system AC elevator speed control system

1978-04-11

1980-01-01

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

318758, 318762, 318741, H02P 140

Patent

active

041811976

ABSTRACT:
A bidirectional triode thyristor is connected to an R phase of a three-phase induction motor through an up contact set and to its S phase through a down contact set. A full-wave rectifier bridge including four diodes is connected across the R and S phases to be enabled during deceleration of the motor. The thyristor is controlled by an R-to-S phase firing circuit responsive to a command acceleration signal during acceleration of the motor and a difference signal between a command deceleration signal and an actual speed signal for the motor during deceleration of the motor.

REFERENCES:
patent: 3805133 (1974-04-01), Hatakeyama et al.
patent: 3860093 (1975-01-01), Mitsui et al.
patent: 3876918 (1975-04-01), Komuro et al.
patent: 3918552 (1975-11-01), Kameyama et al.
patent: 3921046 (1975-11-01), Anzai et al.
patent: 4072212 (1978-02-01), Terazono et al.
patent: 4083431 (1978-04-01), Oohira et al.

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