Electricity: motive power systems – Plural diverse motor controls – Motor-reversing
Patent
1975-03-25
1976-08-24
Schaefer, Robert K.
Electricity: motive power systems
Plural diverse motor controls
Motor-reversing
318624, G05B 1302
Patent
active
039769259
ABSTRACT:
An integral motor controller circuit for supplying variable speed, bidirectional drive to a motor as a function of variations of a sensed parameter includes an amplifier circuit which is responsive to an error signal indicative of deviations of the parameter from a set point to provide an output signal representing the direction and amount of the deviation. The amplifier output signal is applied to a first motor terminal and to an input of a two-level comparator circuit which is responsive to an increasing error signal exceeding a predetermined amount to connect an energizing potential of one polarity to a second motor terminal and responsive to a decreasing error signal in excess of the predetermined amount to connect an energizing potential of the opposite polarity to the second terminal of the motor, the speed of the motor being determined by the level of the amplifier output signal. The motor controller is described with reference to an application in an environmental control system to effect positioning of a damper located in an air duct for supplying heated or cooled air to an area in response to changes in the air temperature in the area.
REFERENCES:
patent: 3430053 (1969-02-01), Westhauer
patent: 3686557 (1972-08-01), Futamuka
patent: 3704404 (1972-11-01), Iversen
patent: 3895287 (1975-07-01), Sun et al.
Duncanson Jr. W. E.
Johnson Controls Inc.
Schaefer Robert K.
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