Position Indicators SYNCHRO EQUIPMENTControl transformer synchros are used when only a voltage indication of angular position isdesired. It is similar in construction to an ordinary synchro except that the rotor windings areused only to generate a voltage which is known as an error voltage. The rotor windings of acontrol transformer synchro are wound with many turns of fine wire to produce a highimpedance. Since the rotor is not fed excitation voltage, the current drawn by the stator windingswould be high if they were the same as an ordinary synchro; therefore, they are also wound withmany turns of fine wire to prevent excessive current.During normal operation, the output of a control transformer synchro is nearly zero (nulled) whenits angular position is the same as that of the transmitter.A simple synchro system, consisting of one synchro transmitter (or generator) connected to onesynchro receiver (or motor), is shown in Figure 2.Figure 2 Simple Synchro SystemWhen the transmitter’s shaft is turned, the synchro receiver’s shaft turns such that its "electricalposition" is the same as the transmitter’s. What this means is that when the transmitter is turnedto electrical zero, the synchro receiver also turns to zero. If the transmitter is disconnected fromthe synchro receiver and then reconnected, its shaft will turn to correspond to the position of thetransmitter shaft.Rev. 0 Page 3 IC-05
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