Elevator – industrial lift truck – or stationary lift for vehicle – Stationary lift for roadway vehicle or required component... – Having specific drive means for support
Patent
1976-03-30
1978-04-18
Schaefer, Robert K.
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
040846628
ABSTRACT:
A control apparatus for an elevator system in which a rotation speed of a drive motor for driving said elevator system is 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 speed control circuit which includes a control amplifier, and is characterized in that a time constant value of the control amplifier is set to different values in constant running operation and in retardation control of the elevator. Additionally, said control apparatus is characterized that the time constant value in retardation control is set so as to make low a transient gain of said control amplifier, and further that a preselected bias is supperimposed to a time constant circuit of said control amplifier at an alternating point from a constant speed running to a slowing down of the elevator, in order to prevent the decrement of the transient gain.
REFERENCES:
patent: 3435916 (1969-04-01), Bell et al.
patent: 3523232 (1970-08-01), Hall et al.
patent: 3552524 (1971-01-01), Benjamin et al.
patent: 3627080 (1971-12-01), Yuminaka et al.
Kito Yastami
Tezuka Minoru
Duncanson Jr. W. E.
Kabushiki Kaisha Meidensha
Nippon Otis Elevator Company
Schaefer Robert K.
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