Elevator – industrial lift truck – or stationary lift for vehicle – Stationary lift for roadway vehicle or required component... – Having specific drive means for support
Patent
1993-03-08
1993-12-28
Stephan, Steven L.
Elevator, industrial lift truck, or stationary lift for vehicle
Stationary lift for roadway vehicle or required component...
Having specific drive means for support
187140, 341 2, B66B 504, B66B 302, H03M 124
Patent
active
052742032
ABSTRACT:
An elevator system (FIG. 1) employing a microprocessor-based group controller (FIG. 2 ) communicating with the cars (3, 4) using car position and velocity information provided by a "smart" primary position transducer (SPPT) system to control the motion of the cars and assign them to handle passenger demands. The SPPT includes an input shaft coupled to a primary encoder disk. Coupled to the shaft through gearing are one or more encoder disks (FIG. 7 ) performing the function of turns counting, as well as additional functions. Each disk contains multiple tracks, and each of these tracks is sensed by a sensor, or, alternatively, the SPPT may use two independent sensors per track. It is important to have two essentially independent means of performing the key sensing functions. The read heads of the SPPT are divided into primary and secondary sets with each set used to feed an independent processor. Within each set of sensor signals, cross checks are performed to insure the integrity of the system, which would detect a cracked or broken glass disk. In the electronics of the SPPT (FIG. 6 ) system primary and secondary position signals are each found by two methods and compared to maximize the likelihood of correct position determination, with one method given priority over the other, depending on the circumstances. Two independent channels for position and velocity information are maintained, using independent parts, except for the input shafts and encoder disks. Exemplary formulae for determining and generating the desired primary and secondary position and velocity information are provided.
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Article entitled "Electronic Controls Cut Elevator Travel Time and Operating Cost", from Machine Design, vol. 53(1981) Apr., No. 8, Cleveland, Ohio, USA pp. 204, 205.
McCarthy Richard C.
Skalski Clement A.
Nappi Robert E.
Otis Elevator Company
Stephan Steven L.
LandOfFree
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