Speed control apparatus for elevators

Details Speed control apparatus for elevators Speed control apparatus for elevators

1988-08-03

1989-09-26

Shoop, Jr., William M.

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

048693472

ABSTRACT:
There is disclosed an elevator speed control apparatus, in which a final signal representative of a traveling speed to be detected is determined by changing a first provisional signal depending on the traveling speed in accordance with a second provisional signal, when a difference between the two provisional signals exceeds a predetermined value; the first provisional signal being obtained on the basis of a pulse width of a pulse from a rotary encoder rotating with the travel of the elevator and the second one being obtained on the basis of a number of pulses in the pulse train for a predetermined sampling period.

REFERENCES:
patent: 4085823 (1978-04-01), Caputo et al.
patent: 4322712 (1982-03-01), Yoshida
patent: 4434874 (1984-03-01), Caputo
patent: 4503939 (1985-03-01), Lawrence et al.

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