SYNCHRO EQUIPMENT Position IndicatorsFigure 1 Synchro SchematicsThe receiver, or synchro motor, is electrically similar to the synchro generator. The synchroreceiver uses the voltage generated by each of the synchro generator windings to position thereceiver rotor. Since the transmitter and receiver are electrically similar, the angular position ofthe receiver rotor corresponds to that of the synchro transmitter rotor. The receiver differsmechanically from the transmitter in that it incorporates a damping device to prevent hunting.Hunting refers to the overshoot and undershoot that occur as the receiving device tries to matchthe sending device. Without the damping device, the receiver would go past the desired pointslightly, then return past the desired point slightly in the other direction. This would continue,by smaller amounts each time, until the receiver came to rest at the desired position. The damperprevents hunting by feeding some of the signal back, thus slowing down the approach to thedesired point.Differential synchros are used with transmitter and receiver synchros to insert a second signal.The angular positions of the transmitter and the differential synchros are compared, and thedifference or sum is transmitted to the receiver. This setup can be used to provide a feedbacksignal to slow the response time of the receiver, thus providing a smooth receiver motion.IC-05 Page 2 Rev. 0
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