Elevator – industrial lift truck – or stationary lift for vehicle – Stationary lift for roadway vehicle or required component... – Having specific drive means for support
Patent
1985-02-26
1986-12-02
Dobeck, B.
Elevator, industrial lift truck, or stationary lift for vehicle
Stationary lift for roadway vehicle or required component...
Having specific drive means for support
318807, B66B 130
Patent
active
046258345
ABSTRACT:
In an elevator speed control apparatus wherein an output signal of a speed detector is sampled at a predetermined interval, and an output signal obtained by processing the sampling is applied to an inverter so as to perform a slip frequency control of an induction motor; correction means to receive the speed detector output signal sampled at the predetermined interval, to differentiate it to generate a differential signal and to deliver the differential signal as a correction signal is provided, so that a magnitude by which a rotational speed of the induction motor changes after the output signal of the speed detector has been fed into a microcomputer until the control signal is applied to the inverter is corrected, whereupon the signal for the speed control is delivered to the inverter, thereby to correct the lag of speed detection attributed to the sampling control.
REFERENCES:
patent: 4320332 (1982-03-01), Sugimoto
patent: 4446946 (1984-05-01), Kajiyama et al.
patent: 4484129 (1984-11-01), Ono
patent: 4501343 (1985-02-01), Salihi
patent: 4519479 (1985-05-01), Tanahashi
Dobeck B.
Duncanson Jr. W. E.
Mitsubishi Denki & Kabushiki Kaisha
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