Velocity detection apparatus for an elevator

Details Velocity detection apparatus for an elevator Velocity detection apparatus for an elevator

1984-10-24

1986-11-18

Heyman, John S.

Electrical pulse counters, pulse dividers, or shift registers: c

Applications

Measuring or testing

187 29R, G01D 700

Patent

active

046240055

ABSTRACT:
A velocity detection apparatus for elevators wherein the time interval between movement magnitude pulses produced at a frequency-representing velocity of the cage of an elevator is detected, and the fixed frequency of sampling pulses is modulated using a modulation coefficient determined by the ratio of the fixed frequency of the sampling pulses to the frequency of the movement magnitude pulses so as to obtain a modulated pulse signal during the interval between the movement magnitude pulses from which the velocity of the elevator cage is obtained. Provision is made to include two memory units for storing the latest two count values on the basis of a sampling pulse signal to determine the difference therebetween corresponding to the velocity of the elevator cage. In an alternate embodiment, a pair of counters is provided for counting both the modulated pulses and the movement magnitude pulses of the elevator to produce count values representing the velocity of the elevator.

REFERENCES:
patent: 3767902 (1973-10-01), Estes, III
patent: 3989932 (1976-11-01), Koerner
patent: 4052676 (1977-10-01), Crittenden
patent: 4093850 (1978-06-01), Karnowski et al.
patent: 4142238 (1979-02-01), Brandt et al.
patent: 4257005 (1981-03-01), Hall
patent: 4446946 (1984-05-01), Kajiyama et al.

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