Control apparatus for an elevator system

Details Control apparatus for an elevator system Control apparatus for an elevator system

1976-03-30

1978-06-20

Scott, James R.

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

040956784

ABSTRACT:
A control apparatus for an elevator system in which a rotation speed of a drive motor for driving said elevator system in controlled by supplying a deviation signal obtained by comparing a speed signal of said drive motor including an induction motor with a driving pattern setting signal; said control apparatus comprising a time function generating circuit operated by means of retarding instruction signal supplied from the elevator and for generating a speed instruction output signal which decreases lineally to zero when a elevator cage approaches to a stop position in a distance of the elevator travelling, a correcting instruction circuit for supplying a correcting signal depending on an error signal of a drive motor or a speed instruction signal of said time function generating circuit, with respect to a reference speed signal, to said time function generating circuit.

REFERENCES:
patent: 3783974 (1974-11-01), Gilbert et al.
patent: 3893695 (1975-07-01), Rickert
patent: 3948357 (1976-04-01), Maynard et al.

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