Elevator system with independent limiting of a speed pattern in terminal zones
AssigneeInventio AG
InventorsColin D. Schauder, Tac H. Nguyen
Life of this patent
Estimating the term…
Abstract
A feedback controlled elevator system driven by a traction drive motor in response to a speed pattern provided by a car controller. The speed pattern is limited when the car approaches a terminal floor within a predetermined terminal slowdown zone adjacent to the terminal floor. A pattern limiting signal is provided in response to digital integration of shaft encoder signals which provides a digital position "x" of the car within a terminal zone. The position "x" of the car is then used to access a read-only-memory which contains the maximum car speed for the specific location of the elevator car. The value from the read-only memory is used to limit the speed pattern.
Claims7
In a feedback controlled traction elevator system having an elevator car and counterweight positionally controlled in a hatch of a building by a traction sheave driven by a traction drive motor under the direction of feedback control which includes a speed pattern for controlling at least the slowdown speed of the elevator car, comprising:
- first means establishing upper and lower terminal slowdown zones in the hatch adjacent to upper and lower terminal floors, respectively, of the building,
- second means translating angular rotation of the traction motor to distance "x" traveled by the elevator car into a terminal zone,
- third means providing a maximum car speed at predetermined values of "x", for stopping the elevator car at a terminal floor at a predetermined deceleration rate,
- and fourth means for limiting the speed pattern to the maximum car speed provided by the third means as the elevator car approaches a terminal floor in a terminal zone.
Dependencies are inferred from the claim text.