The geometric loci of the synchronous tie

SYNCHRONOUS TIE is the name given to a system of two identical induction machines with stators supplied from a common polyphase line and with rotors interconnected. A rotation impressed on one of the shafts causes a corresponding motion of the second shaft, as if there were a mechanical coupling of some sort. Thus the tie finds uses as a remote indicating or positioning device, and also in applications where considerable power interchanges are required between two distant shafts in continuous synchronized rotation.