Control system for an AC elevator

Details Control system for an AC elevator Control system for an AC elevator

1986-12-22

1988-05-03

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

318762, B66B 132

Patent

active

047414154

ABSTRACT:
Three pairs of reversed polarity thyristors 20a,21a; 24a,25a; 28c,29c are connected directly between the three phases R, S, T of an AC power source and the corresponding phases of an elevator drive motor 5. The two pairs connected to the R and S phases implement upward driving, and the third pair connected to the T phase is used for both upward and downward driving but is held non-conductive during regenerative braking/deceleration when the motor operates in a two phase mode. Two additional thyristor pairs 22b,23b; 26b,27b which are used for downward driving are cross-connected between the R and S power source phases and two of the motor phases, to thus reverse the direction of motor rotation. Different individual thyristors in the pairs coupled to the R and S phases are selected in upward and downward deceleration modes. The overall circuit arrangement and firing selection/control scheme is designed to implement load sharing between the various thyristors and thus minimize duty cycle differences.

REFERENCES:
patent: 4042069 (1977-08-01), Ohira et al.
patent: 4319665 (1982-03-01), Komuro et al.
patent: 4491197 (1985-01-01), Nishiwaki
patent: 4496894 (1985-01-01), Petersen
patent: 4545464 (1985-10-01), Nomura
patent: 4567555 (1986-01-01), Matsuse et al.

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