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APPENDIX I GLOSSARY - 14187_169
APPENDIX I GLOSSARY - 14187_171

Neets Module 15-Principles of Synchros, Servos, and Gyros
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AI-2 CONTROL TRANSMITTER (CX)—A type of synchro that converts a mechanical input, which is the angular position of its rotor, into an electrical output signal. The output is taken from the stator windings and is used to drive either a CDX or CT. CORRESPONDENCE—The term given to the positions of the rotors of a synchro transmitter and a synchro receiver when both rotors are on 0 or displaced from 0 by the same angle. DAMPING—A mechanical or electrical technique used in synchro receivers to prevent the rotor from oscillating or spinning. Damping is also used in servo systems to minimize overshoot of the load. DATA TRANSMISSION—The transfer of information from one place to another or from one part of a system to another. DEGREE-OF-FREEDOM—The number of axes about which a gyro is free to precess. DEMODULATOR—A circuit used in servo systems to convert an ac signal to a dc signal. The magnitude of the dc output is determined by the magnitude of the ac input signal, and its polarity is determined by whether the ac input signal is in or out of phase with the ac reference voltage. DOUBLE RECEIVER—A fine and coarse synchro receiver enclosed in a common housing with a two-shaft output (one shaft inside the other). E-TRANSFORMER—A special form of differential transformer using an E-shaped core. The secondaries of the transformer are wound on the outer legs of the E, and the primary is on the center leg. An output voltage is developed across the secondary coils when its armature is displaced from its neutral position. This device is used as an error detector in servo systems that have limited load movements. ELECTRICAL-LOCK—A synchro zeroing method. This method is used only when the rotors of the synchros to be zeroed are free to turn and their leads are accessible. ELECTRICAL ZERO—A standard synchro position, with a definite set of stator voltages, that is used as the reference point for alignment of all synchro units. ERECTING (A GYRO)—The positioning of a gyro into a desired position and the maintaining of that position. ERROR DETECTOR—The component in a servo system that determines when the load has deviated from its ordered position, velocity, etc. ERROR REDUCER—The name commonly given to the servo motor in a servo system. So named because it reduces the error signal by providing feedback to the error detector. ERROR SIGNAL—In servo systems, the signal whose amplitude and polarity or phase are used to correct the alignment between the controlling and the controlled element. It is also the name given to the electrical output of a control transformer (CT). EXCITATION VOLTAGE—The supply voltage required to excite a circuit. FREQUENCY RESPONSE—The measure of a servo's ability to respond to various input frequencies.






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