Patent
Proportional motor actuator circuit
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TLDR
In this article, a motor actuator circuit for use in heating and air conditioning and process control systems to selectively rotate a motor shaft which positions a damper or valve is described.Abstract:
A motor actuator circuit for use in heating and air conditioning and process control systems to selectively rotate a motor shaft which positions a damper or valve. A command signal, such as a voltage, or a potentiometer controlled by a sensing element of the system provides a signal representing the desired position for the damper and a sense potentiometer provides a signal representing the actual shaft position; a signal comparator circuit including a differential amplifier having an output switching stage is responsive to a potential difference between the signals to effect energization of one of a pair of motor windings, the energized one of the pair being determined by the polarity of the difference signal; and detent circuits derive a detent signal from the voltage across the other one of the motor windings for coupling to the amplifier input to increase the potential difference, the sense potentiometer wiper being linked to the motor shaft so that the potential difference decreases as the shaft rotates to the desired position, and the motor is deenergized when the desired position is reached.read more
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References
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Patent
Control system including common mode feedback
TL;DR: In this article, a common mode feedback circuit is described for differentially operating a load, such as a DC motor, in accordance with the difference between a pair of input signals to accurately position the shaft of the motor in respect of such difference.
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Phase discriminating control apparatus for a bidirectional solid-state ac position servomotor control
Walter Tomasulo,George R Brown +1 more
TL;DR: In this paper, a phase discriminating control apparatus which provides one of two alternating current outputs depending upon which of the two alternating currents inputs to the apparatus is leading is presented. But the phase relationship between the input signals is not determined.