I'm making a project of arduino mega 2560 with 3 ac servo motor. But I have no idea how to remember those servos' position with arduino. Does anyone have an idea about this?
Can you supply a link to the AC servo motors you have used please.
The servo controller will know. What is signaling the controller? It knows.
You can save the values in EEPROM. Use the update function in the EEPROM library to minimize the wear out of the EEPROM. I use FRAM memory as it has over a trillion r/w cycles. If you have a RTC some have static ram inplace of the EEPROM. that will work great as well.
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