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SYNCHRO EQUIPMENT
Figure 2    Simple Synchro System

Instrumentation and Control Volume 1 of 2
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SYNCHRO EQUIPMENT Position Indicators Figure 1    Synchro Schematics The  receiver,  or  synchro  motor,  is  electrically  similar  to  the  synchro  generator.   The  synchro receiver  uses  the  voltage  generated  by  each  of  the  synchro  generator  windings  to  position  the receiver rotor.   Since the transmitter and receiver are electrically similar, the angular position of the  receiver  rotor  corresponds  to  that  of  the  synchro  transmitter  rotor.    The  receiver  differs mechanically 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 match the sending device.   Without the damping device, the receiver would go past the desired point slightly, 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 damper prevents  hunting  by  feeding  some  of  the  signal  back,  thus  slowing  down  the  approach  to  the desired 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  the difference or sum is transmitted to the receiver.   This setup can be used to provide a feedback signal to slow the response time of the receiver, thus providing a smooth receiver motion. IC-05 Page 2 Rev. 0







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