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.
