Control system for a transportation system

Details Control system for a transportation system Control system for a transportation system

1974-04-29

1976-03-02

Schaefer, Robert K,

Elevator, industrial lift truck, or stationary lift for vehicle

Stationary lift for roadway vehicle or required component...

Having specific drive means for support

B66B 130

Patent

active

039412148

ABSTRACT:
A solid state static converter is connected to receive a three-phase A.C. input and directly supply a direct current output to a D.C. motor which operates a traction sheave to control the movement of an elevator car. The magnitude and direction of the direct current output from the static converter is controlled by an error signal derived by the summation of a speed signal obtained from a tachometer coupled to the motor drive shaft and a vehicle speed command signal provided by a pattern generator and having maximum velocity, acceleration and rate of change of acceleration limitations for safe and smooth control of the elevator car and for accurate stopping at landings.

REFERENCES:
patent: 3350612 (1967-10-01), Hansen et al.
patent: 3523232 (1970-08-01), Hall et al.
patent: 3584706 (1971-06-01), Hall et al.
patent: 3627080 (1971-12-01), Yuminoka
patent: 3783974 (1974-01-01), Gilbert et al.
patent: 3826236 (1974-08-01), Close

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