Elevator – industrial lift truck – or stationary lift for vehicle – Stationary lift for roadway vehicle or required component... – Having specific drive means for support
Patent
1974-04-29
1976-04-06
Scott, James R.
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
039483576
ABSTRACT:
A solid state static converter receives a three-phase A.C. input and directly supplies direct current to a D.C. motor operating a traction sheave to control the movement of an elevator car in response to an error signal derived by the selective summation of a speed signal from a tachometer and a pair of vehicle speed command signals. One command signal is a function of the commanded velocity versus time and operatively controls the system during acceleration, constant velocity and a portion of deceleration. The other command signal is a function of the commanded velocity versus time as modified by the sensed position of the car and solely operatively controls the system during a portion of deceleration to stop the vehicle at a selected landing. The modified decelerating vehicle speed command signal is provided by an integrating circuit receiving stepped inputs as a function of a preconditioning input and the command signal input from a feedback circuit and modified in accordance with the sensed position of the vehicle to provide a vehicle command signal having a predetermined plurality of slopes.
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Maynard John T.
Young Christopher
Armor Elevator Company, Inc.
Duncanson Jr. W. E.
Scott James R.
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