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Unidirectional Servo

IP.com Disclosure Number: IPCOM000098929D
Original Publication Date: 1958-Dec-01
Included in the Prior Art Database: 2005-Mar-08
Document File: 2 page(s) / 53K

Publishing Venue

IBM

Related People

Dixon, JO: AUTHOR [+4]

Abstract

This transistorized control circuit enables the operation of a servo mechanism as a limit finding and storage device. The circuit permits the servo to respond only to a signal which is either larger or smaller than any signal previously received in accordance with a preselected high or low mode of operation. The highest or lowest signal equivalent is stored in the servomechanism until the device is intentionally reset. The servomechanism arrangement comprises a two-phase drive motor, a linear transistor half-wave rectifier circuit, a filtering circuit, a transistor used as a switch, and a control relay. An output of the servo drive motor is coupled to the linear transistor half-wave rectifier.

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Unidirectional Servo

This transistorized control circuit enables the operation of a servo mechanism as a limit finding and storage device. The circuit permits the servo to respond only to a signal which is either larger or smaller than any signal previously received in accordance with a preselected high or low mode of operation. The highest or lowest signal equivalent is stored in the servomechanism until the device is intentionally reset. The servomechanism arrangement comprises a two-phase drive motor, a linear transistor half-wave rectifier circuit, a filtering circuit, a transistor used as a switch, and a control relay. An output of the servo drive motor is coupled to the linear transistor half-wave rectifier. An AC voltage is rectified by this into a plus or minus DC signal, depending upon the phase relationship of the servomotor voltage to the line voltage supplied to the rectifier circuit. The DC signal is then passed through a multistage RC filter network, and then applied to a transistor switch device for the purpose of actuating a control relay. The points of the control relay in turn control the energization and de-energization of the servo drive motor.

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