Command speed signal generation system

Details Command speed signal generation system Command speed signal generation system

1975-11-03

1978-09-26

Schaefer, Robert K.

Electricity: motive power systems

Control by patterns or other predetermined schedule means

Motor running-speed control

187 29R, G05B 1902, H02P 718

Patent

active

041173821

ABSTRACT:
A dc voltage is applied to an R-C element through a Bootstrap type linearly charging circuit to form a command speed voltage smoothly and linearly increased from its null magnitude to a constant magnitude for the acceleration of an elevator car. Upon decelerating the car, the dc voltage is decreased stepwise by successively opening serially interconnected contact sets coupled to a shortcircuit resistor and applied to a unidirectional R-C element including a diode through the linearly charging circuit. An output from the element is coupled to the stepped voltage through an R-C discharge circuit to produce from the element a command speed signal smoothly and linearly decreased to its null magnitude.

REFERENCES:
patent: 3909734 (1975-09-01), Palombo et al.
patent: 3921046 (1975-11-01), Anzai et al.
patent: 3941214 (1976-03-01), Young et al.
Millman & Taub, Pulse, Digital, and Switching Waveforms, 1965, pp. 535-540.

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