Electricity: motive power systems – Plural – diverse or diversely controlled electric motors – Running-speed control
Patent
1975-04-30
1976-11-02
Cherry, Johnny D.
Electricity: motive power systems
Plural, diverse or diversely controlled electric motors
Running-speed control
198855, 317 5, 340268, H02P 550
Patent
active
039899896
ABSTRACT:
A control system is provided for stopping the operation of a bulk material conveyor system in response to an indication that the speed of either drive or driven elements thereof are above or below acceptable amounts, that the output speed of a particular material handling component falls below an acceptable difference from the input speed to said component, or that the speed of an upstream material handling component falls outside an acceptable difference with respect to the speed of a downstream material handling component feeding material to said upstream component. Speed indication is provided by the electrical signal output from dc tachometer-generators associated with the drive or driven shafts of the component whose speed is being sensed. The signals are, in turn, transmitted to the input networks of speed comparators; there being one such comparator for each comparison to be made with each such speed comparator incorporating an integrated circuit operational amplifier and an emitter follower power amplifier connected as a comparator circuit with hysteresis. A reed relay also incorporated in the speed comparator, operates in response to a signal from said comparator circuit indicative of improper material handling component operation to effect stoppage of the conveyor system.
REFERENCES:
patent: 2443048 (1948-06-01), McComb
patent: 2695376 (1954-11-01), Emms et al.
patent: 2808922 (1957-10-01), Lutman, Jr.
patent: 2875388 (1959-02-01), Scheu
patent: 2888129 (1959-05-01), Chapman
patent: 3050670 (1962-08-01), Anger et al.
patent: 3084307 (1963-04-01), Landis
patent: 3612252 (1971-10-01), Yu
patent: 3877003 (1975-04-01), Kawashima
Cherry Johnny D.
Litton Systems Inc.
Pollack Morris I.
Thomson Richard K.
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