Electricity: motive power systems – Positional servo systems – Digital or numerical systems
Patent
1988-06-30
1989-09-05
Shoop, Jr., William M.
Electricity: motive power systems
Positional servo systems
Digital or numerical systems
187101, 187134, G05B 1929
Patent
active
048642088
ABSTRACT:
An actual position value transmitter for an elevator position control circuit includes a pulse transmitter in the form of a digital tachometer which is driven by way of a cable and a car distance counter responsive to the pulses for generating an actual position signal. Stopping errors of the elevator car caused by slip of the cable are avoided by utilizing a correction table in the form of a write-read memory, in which correction values assigned to the floors and corresponding to the stopping errors are stored. The correction table is connected to the car distance counter and on departure of the elevator car from a floor or on passing a floor, a correction value assigned to the next floor is fetched from the correction table and fed to the car distance counter for the purpose of correction of the actual position signal.
REFERENCES:
patent: 4337847 (1982-07-01), Schroder et al.
patent: 4389631 (1983-06-01), Kajiyama
patent: 4427095 (1984-01-01), Payne et al.
patent: 4627518 (1986-12-01), Meguerdichian
patent: 4754851 (1988-07-01), Suzuki
Bergmann Saul M.
Inventio AG
Shoop Jr. William M.
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